5.3. Arm CPU Specific Build Macros

This document describes the various build options present in the CPU specific operations framework to enable errata workarounds and to enable optimizations for a specific CPU on a platform.

5.3.1. Security Vulnerability Workarounds

TF-A exports a series of build flags which control which security vulnerability workarounds should be applied at runtime.

  • WORKAROUND_CVE_2017_5715: Enables the security workaround for CVE-2017-5715. This flag can be set to 0 by the platform if none of the PEs in the system need the workaround. Setting this flag to 0 provides no performance benefit for non-affected platforms, it just helps to comply with the recommendation in the spec regarding workaround discovery. Defaults to 1.

  • WORKAROUND_CVE_2018_3639: Enables the security workaround for CVE-2018-3639. Defaults to 1. The TF-A project recommends to keep the default value of 1 even on platforms that are unaffected by CVE-2018-3639, in order to comply with the recommendation in the spec regarding workaround discovery.

  • DYNAMIC_WORKAROUND_CVE_2018_3639: Enables dynamic mitigation for CVE-2018-3639. This build option should be set to 1 if the target platform contains at least 1 CPU that requires dynamic mitigation. Defaults to 0.

  • WORKAROUND_CVE_2022_23960: Enables mitigation for CVE-2022-23960. This build option should be set to 1 if the target platform contains at least 1 CPU that requires this mitigation. Defaults to 1.

5.3.2. CPU Errata Workarounds

TF-A exports a series of build flags which control the errata workarounds that are applied to each CPU by the reset handler. The errata details can be found in the CPU specific errata documents published by Arm:

The errata workarounds are implemented for a particular revision or a set of processor revisions. This is checked by the reset handler at runtime. Each errata workaround is identified by its ID as specified in the processor’s errata notice document. The format of the define used to enable/disable the errata workaround is ERRATA_<Processor name>_<ID>, where the Processor name is for example A57 for the Cortex_A57 CPU.

Refer to CPU errata implementation for information on how to write errata workaround functions.

All workarounds are disabled by default. The platform is responsible for enabling these workarounds according to its requirement by defining the errata workaround build flags in the platform specific makefile. In case these workarounds are enabled for the wrong CPU revision then the errata workaround is not applied. In the DEBUG build, this is indicated by printing a warning to the crash console.

In the current implementation, a platform which has more than 1 variant with different revisions of a processor has no runtime mechanism available for it to specify which errata workarounds should be enabled or not.

The value of the build flags is 0 by default, that is, disabled. A value of 1 will enable it.

For Cortex-A9, the following errata build flags are defined :

  • ERRATA_A9_794073: This applies errata 794073 workaround to Cortex-A9 CPU. This needs to be enabled for all revisions of the CPU.

For Cortex-A15, the following errata build flags are defined :

  • ERRATA_A15_816470: This applies errata 816470 workaround to Cortex-A15 CPU. This needs to be enabled only for revision >= r3p0 of the CPU.

  • ERRATA_A15_827671: This applies errata 827671 workaround to Cortex-A15 CPU. This needs to be enabled only for revision >= r3p0 of the CPU.

For Cortex-A17, the following errata build flags are defined :

  • ERRATA_A17_852421: This applies errata 852421 workaround to Cortex-A17 CPU. This needs to be enabled only for revision <= r1p2 of the CPU.

  • ERRATA_A17_852423: This applies errata 852423 workaround to Cortex-A17 CPU. This needs to be enabled only for revision <= r1p2 of the CPU.

For Cortex-A35, the following errata build flags are defined :

  • ERRATA_A35_855472: This applies errata 855472 workaround to Cortex-A35 CPUs. This needs to be enabled only for revision r0p0 of Cortex-A35.

For Cortex-A53, the following errata build flags are defined :

  • ERRATA_A53_819472: This applies errata 819472 workaround to all CPUs. This needs to be enabled only for revision <= r0p1 of Cortex-A53.

  • ERRATA_A53_824069: This applies errata 824069 workaround to all CPUs. This needs to be enabled only for revision <= r0p2 of Cortex-A53.

  • ERRATA_A53_826319: This applies errata 826319 workaround to Cortex-A53 CPU. This needs to be enabled only for revision <= r0p2 of the CPU.

  • ERRATA_A53_827319: This applies errata 827319 workaround to all CPUs. This needs to be enabled only for revision <= r0p2 of Cortex-A53.

  • ERRATA_A53_835769: This applies erratum 835769 workaround at compile and link time to Cortex-A53 CPU. This needs to be enabled for some variants of revision <= r0p4. This workaround can lead the linker to create *.stub sections.

  • ERRATA_A53_836870: This applies errata 836870 workaround to Cortex-A53 CPU. This needs to be enabled only for revision <= r0p3 of the CPU. From r0p4 and onwards, this errata is enabled by default in hardware. Identical to A53_DISABLE_NON_TEMPORAL_HINT.

  • ERRATA_A53_843419: This applies erratum 843419 workaround at link time to Cortex-A53 CPU. This needs to be enabled for some variants of revision <= r0p4. This workaround can lead the linker to emit *.stub sections which are 4kB aligned.

  • ERRATA_A53_855873: This applies errata 855873 workaround to Cortex-A53 CPUs. Though the erratum is present in every revision of the CPU, this workaround is only applied to CPUs from r0p3 onwards, which feature a chicken bit in CPUACTLR_EL1 to enable a hardware workaround. Earlier revisions of the CPU have other errata which require the same workaround in software, so they should be covered anyway.

  • ERRATA_A53_1530924: This applies errata 1530924 workaround to all revisions of Cortex-A53 CPU.

For Cortex-A55, the following errata build flags are defined :

  • ERRATA_A55_768277: This applies errata 768277 workaround to Cortex-A55 CPU. This needs to be enabled only for revision r0p0 of the CPU.

  • ERRATA_A55_778703: This applies errata 778703 workaround to Cortex-A55 CPU. This needs to be enabled only for revision r0p0 of the CPU.

  • ERRATA_A55_798797: This applies errata 798797 workaround to Cortex-A55 CPU. This needs to be enabled only for revision r0p0 of the CPU.

  • ERRATA_A55_846532: This applies errata 846532 workaround to Cortex-A55 CPU. This needs to be enabled only for revision <= r0p1 of the CPU.

  • ERRATA_A55_903758: This applies errata 903758 workaround to Cortex-A55 CPU. This needs to be enabled only for revision <= r0p1 of the CPU.

  • ERRATA_A55_1221012: This applies errata 1221012 workaround to Cortex-A55 CPU. This needs to be enabled only for revision <= r1p0 of the CPU.

  • ERRATA_A55_1530923: This applies errata 1530923 workaround to all revisions of Cortex-A55 CPU.

For Cortex-A57, the following errata build flags are defined :

  • ERRATA_A57_806969: This applies errata 806969 workaround to Cortex-A57 CPU. This needs to be enabled only for revision r0p0 of the CPU.

  • ERRATA_A57_813419: This applies errata 813419 workaround to Cortex-A57 CPU. This needs to be enabled only for revision r0p0 of the CPU.

  • ERRATA_A57_813420: This applies errata 813420 workaround to Cortex-A57 CPU. This needs to be enabled only for revision r0p0 of the CPU.

  • ERRATA_A57_814670: This applies errata 814670 workaround to Cortex-A57 CPU. This needs to be enabled only for revision r0p0 of the CPU.

  • ERRATA_A57_817169: This applies errata 817169 workaround to Cortex-A57 CPU. This needs to be enabled only for revision <= r0p1 of the CPU.

  • ERRATA_A57_826974: This applies errata 826974 workaround to Cortex-A57 CPU. This needs to be enabled only for revision <= r1p1 of the CPU.

  • ERRATA_A57_826977: This applies errata 826977 workaround to Cortex-A57 CPU. This needs to be enabled only for revision <= r1p1 of the CPU.

  • ERRATA_A57_828024: This applies errata 828024 workaround to Cortex-A57 CPU. This needs to be enabled only for revision <= r1p1 of the CPU.

  • ERRATA_A57_829520: This applies errata 829520 workaround to Cortex-A57 CPU. This needs to be enabled only for revision <= r1p2 of the CPU.

  • ERRATA_A57_833471: This applies errata 833471 workaround to Cortex-A57 CPU. This needs to be enabled only for revision <= r1p2 of the CPU.

  • ERRATA_A57_859972: This applies errata 859972 workaround to Cortex-A57 CPU. This needs to be enabled only for revision <= r1p3 of the CPU.

  • ERRATA_A57_1319537: This applies errata 1319537 workaround to all revisions of Cortex-A57 CPU.

For Cortex-A72, the following errata build flags are defined :

  • ERRATA_A72_859971: This applies errata 859971 workaround to Cortex-A72 CPU. This needs to be enabled only for revision <= r0p3 of the CPU.

  • ERRATA_A72_1319367: This applies errata 1319367 workaround to all revisions of Cortex-A72 CPU.

For Cortex-A73, the following errata build flags are defined :

  • ERRATA_A73_852427: This applies errata 852427 workaround to Cortex-A73 CPU. This needs to be enabled only for revision r0p0 of the CPU.

  • ERRATA_A73_855423: This applies errata 855423 workaround to Cortex-A73 CPU. This needs to be enabled only for revision <= r0p1 of the CPU.

For Cortex-A75, the following errata build flags are defined :

  • ERRATA_A75_764081: This applies errata 764081 workaround to Cortex-A75 CPU. This needs to be enabled only for revision r0p0 of the CPU.

  • ERRATA_A75_790748: This applies errata 790748 workaround to Cortex-A75

    CPU. This needs to be enabled only for revision r0p0 of the CPU.

For Cortex-A76, the following errata build flags are defined :

  • ERRATA_A76_1073348: This applies errata 1073348 workaround to Cortex-A76 CPU. This needs to be enabled only for revision <= r1p0 of the CPU.

  • ERRATA_A76_1130799: This applies errata 1130799 workaround to Cortex-A76 CPU. This needs to be enabled only for revision <= r2p0 of the CPU.

  • ERRATA_A76_1220197: This applies errata 1220197 workaround to Cortex-A76 CPU. This needs to be enabled only for revision <= r2p0 of the CPU.

  • ERRATA_A76_1257314: This applies errata 1257314 workaround to Cortex-A76 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.

  • ERRATA_A76_1262606: This applies errata 1262606 workaround to Cortex-A76 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.

  • ERRATA_A76_1262888: This applies errata 1262888 workaround to Cortex-A76 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.

  • ERRATA_A76_1275112: This applies errata 1275112 workaround to Cortex-A76 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.

  • ERRATA_A76_1791580: This applies errata 1791580 workaround to Cortex-A76 CPU. This needs to be enabled only for revision <= r4p0 of the CPU.

  • ERRATA_A76_1165522: This applies errata 1165522 workaround to all revisions of Cortex-A76 CPU. This errata is fixed in r3p0 but due to limitation of errata framework this errata is applied to all revisions of Cortex-A76 CPU.

  • ERRATA_A76_1868343: This applies errata 1868343 workaround to Cortex-A76 CPU. This needs to be enabled only for revision <= r4p0 of the CPU.

  • ERRATA_A76_1946160: This applies errata 1946160 workaround to Cortex-A76 CPU. This needs to be enabled only for revisions r3p0 - r4p1 of the CPU.

  • ERRATA_A76_2743102: This applies errata 2743102 workaround to Cortex-A76 CPU. This needs to be enabled for all revisions <= r4p1 of the CPU and is still open.

For Cortex-A77, the following errata build flags are defined :

  • ERRATA_A77_1508412: This applies errata 1508412 workaround to Cortex-A77 CPU. This needs to be enabled only for revision <= r1p0 of the CPU.

  • ERRATA_A77_1925769: This applies errata 1925769 workaround to Cortex-A77 CPU. This needs to be enabled only for revision <= r1p1 of the CPU.

  • ERRATA_A77_1946167: This applies errata 1946167 workaround to Cortex-A77 CPU. This needs to be enabled only for revision <= r1p1 of the CPU.

  • ERRATA_A77_1791578: This applies errata 1791578 workaround to Cortex-A77 CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open.

  • ERRATA_A77_2356587: This applies errata 2356587 workaround to Cortex-A77 CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open.

  • ERRATA_A77_1800714: This applies errata 1800714 workaround to Cortex-A77 CPU. This needs to be enabled for revisions <= r1p1 of the CPU.

  • ERRATA_A77_2743100: This applies errata 2743100 workaround to Cortex-A77 CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open.

For Cortex-A78, the following errata build flags are defined :

  • ERRATA_A78_1688305: This applies errata 1688305 workaround to Cortex-A78 CPU. This needs to be enabled only for revision r0p0 - r1p0 of the CPU.

  • ERRATA_A78_1941498: This applies errata 1941498 workaround to Cortex-A78 CPU. This needs to be enabled for revisions r0p0, r1p0, and r1p1 of the CPU.

  • ERRATA_A78_1951500: This applies errata 1951500 workaround to Cortex-A78 CPU. This needs to be enabled for revisions r1p0 and r1p1, r0p0 has the same issue but there is no workaround for that revision.

  • ERRATA_A78_1821534: This applies errata 1821534 workaround to Cortex-A78 CPU. This needs to be enabled for revisions r0p0 and r1p0.

  • ERRATA_A78_1952683: This applies errata 1952683 workaround to Cortex-A78 CPU. This needs to be enabled for revision r0p0, it is fixed in r1p0.

  • ERRATA_A78_2132060: This applies errata 2132060 workaround to Cortex-A78 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2. It is still open.

  • ERRATA_A78_2242635: This applies errata 2242635 workaround to Cortex-A78 CPU. This needs to be enabled for revisions r1p0, r1p1, and r1p2. The issue is present in r0p0 but there is no workaround. It is still open.

  • ERRATA_A78_2376745: This applies errata 2376745 workaround to Cortex-A78 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2, and it is still open.

  • ERRATA_A78_2395406: This applies errata 2395406 workaround to Cortex-A78 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2, and it is still open.

  • ERRATA_A78_2712571: This applies erratum 2712571 workaround to Cortex-A78

    CPU, this erratum affects system configurations that do not use an ARM interconnect IP. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 and it is still open.

  • ERRATA_A78_2742426: This applies erratum 2742426 workaround to Cortex-A78 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 and it is still open.

  • ERRATA_A78_2772019: This applies errata 2772019 workaround to Cortex-A78 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2, and it is still open.

  • ERRATA_A78_2779479: This applies erratum 2779479 workaround to Cortex-A78 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 and it is still open.

For Cortex-A78AE, the following errata build flags are defined :

  • ERRATA_A78_AE_1941500This applies errata 1941500 workaround to

    Cortex-A78AE CPU. This needs to be enabled for revisions r0p0 and r0p1. This erratum is still open.

  • ERRATA_A78_AE_1951502 : This applies errata 1951502 workaround to Cortex-A78AE CPU. This needs to be enabled for revisions r0p0 and r0p1. This erratum is still open.

  • ERRATA_A78_AE_2376748 : This applies errata 2376748 workaround to Cortex-A78AE CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. This erratum is still open.

  • ERRATA_A78_AE_2395408 : This applies errata 2395408 workaround to Cortex-A78AE CPU. This needs to be enabled for revisions r0p0 and r0p1. This erratum is still open.

  • ERRATA_A78_AE_2712574 : This applies erratum 2712574 workaround to Cortex-A78AE CPU. This erratum affects system configurations that do not use an ARM interconnect IP. This needs to be enabled for revisions r0p0, r0p1 and r0p2. This erratum is still open.

For Cortex-A78C, the following errata build flags are defined :

  • ERRATA_A78C_1827430 : This applies errata 1827430 workaround to Cortex-A78C CPU. This needs to be enabled for revision r0p0. The erratum is fixed in r0p1.

  • ERRATA_A78C_1827440 : This applies errata 1827440 workaround to Cortex-A78C CPU. This needs to be enabled for revision r0p0. The erratum is fixed in r0p1.

  • ERRATA_A78C_2132064 : This applies errata 2132064 workaround to Cortex-A78C CPU. This needs to be enabled for revisions r0p1, r0p2 and it is still open.

  • ERRATA_A78C_2242638 : This applies errata 2242638 workaround to Cortex-A78C CPU. This needs to be enabled for revisions r0p1, r0p2 and it is still open.

  • ERRATA_A78C_2376749 : This applies errata 2376749 workaround to Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2. This erratum is still open.

  • ERRATA_A78C_2395411 : This applies errata 2395411 workaround to Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2. This erratum is still open.

  • ERRATA_A78C_2683027 : This applies errata 2683027 workaround to Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2. This erratum is still open.

  • ERRATA_A78C_2712575 : This applies erratum 2712575 workaround to Cortex-A78C CPU, this erratum affects system configurations that do not use an ARM interconnect IP. This needs to be enabled for revisions r0p1 and r0p2 and is still open.

  • ERRATA_A78C_2743232 : This applies erratum 2743232 workaround to Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2. This erratum is still open.

  • ERRATA_A78C_2772121 : This applies errata 2772121 workaround to Cortex-A78C CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. This erratum is still open.

  • ERRATA_A78C_2779484 : This applies errata 2779484 workaround to Cortex-A78C CPU. This needs to be enabled for revisions r0p1 and r0p2. This erratum is still open.

For Cortex-X1 CPU, the following errata build flags are defined:

  • ERRATA_X1_1821534This applies errata 1821534 workaround to Cortex-X1

    CPU. This needs to be enabled only for revision <= r1p0 of the CPU.

  • ERRATA_X1_1688305This applies errata 1688305 workaround to Cortex-X1

    CPU. This needs to be enabled only for revision <= r1p0 of the CPU.

  • ERRATA_X1_1827429This applies errata 1827429 workaround to Cortex-X1

    CPU. This needs to be enabled only for revision <= r1p0 of the CPU.

For Neoverse N1, the following errata build flags are defined :

  • ERRATA_N1_1073348: This applies errata 1073348 workaround to Neoverse-N1 CPU. This needs to be enabled only for revision r0p0 and r1p0 of the CPU.

  • ERRATA_N1_1130799: This applies errata 1130799 workaround to Neoverse-N1 CPU. This needs to be enabled only for revision <= r2p0 of the CPU.

  • ERRATA_N1_1165347: This applies errata 1165347 workaround to Neoverse-N1 CPU. This needs to be enabled only for revision <= r2p0 of the CPU.

  • ERRATA_N1_1207823: This applies errata 1207823 workaround to Neoverse-N1 CPU. This needs to be enabled only for revision <= r2p0 of the CPU.

  • ERRATA_N1_1220197: This applies errata 1220197 workaround to Neoverse-N1 CPU. This needs to be enabled only for revision <= r2p0 of the CPU.

  • ERRATA_N1_1257314: This applies errata 1257314 workaround to Neoverse-N1 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.

  • ERRATA_N1_1262606: This applies errata 1262606 workaround to Neoverse-N1 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.

  • ERRATA_N1_1262888: This applies errata 1262888 workaround to Neoverse-N1 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.

  • ERRATA_N1_1275112: This applies errata 1275112 workaround to Neoverse-N1 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.

  • ERRATA_N1_1315703: This applies errata 1315703 workaround to Neoverse-N1 CPU. This needs to be enabled only for revision <= r3p0 of the CPU.

  • ERRATA_N1_1542419: This applies errata 1542419 workaround to Neoverse-N1 CPU. This needs to be enabled only for revisions r3p0 - r4p0 of the CPU.

  • ERRATA_N1_1868343: This applies errata 1868343 workaround to Neoverse-N1 CPU. This needs to be enabled only for revision <= r4p0 of the CPU.

  • ERRATA_N1_1946160: This applies errata 1946160 workaround to Neoverse-N1 CPU. This needs to be enabled for revisions r3p0, r3p1, r4p0, and r4p1, for revisions r0p0, r1p0, and r2p0 there is no workaround.

  • ERRATA_N1_2743102: This applies errata 2743102 workaround to Neoverse-N1 CPU. This needs to be enabled for all revisions <= r4p1 of the CPU and is still open.

For Neoverse V1, the following errata build flags are defined :

  • ERRATA_V1_1618635: This applies errata 1618635 workaround to Neoverse-V1 CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in r1p0.

  • ERRATA_V1_1774420: This applies errata 1774420 workaround to Neoverse-V1 CPU. This needs to be enabled only for revisions r0p0 and r1p0, it is fixed in r1p1.

  • ERRATA_V1_1791573: This applies errata 1791573 workaround to Neoverse-V1 CPU. This needs to be enabled only for revisions r0p0 and r1p0, it is fixed in r1p1.

  • ERRATA_V1_1852267: This applies errata 1852267 workaround to Neoverse-V1 CPU. This needs to be enabled only for revisions r0p0 and r1p0, it is fixed in r1p1.

  • ERRATA_V1_1925756: This applies errata 1925756 workaround to Neoverse-V1 CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open.

  • ERRATA_V1_1940577: This applies errata 1940577 workaround to Neoverse-V1 CPU. This needs to be enabled only for revision r1p0 and r1p1 of the CPU.

  • ERRATA_V1_1966096: This applies errata 1966096 workaround to Neoverse-V1 CPU. This needs to be enabled for revisions r1p0 and r1p1 of the CPU, the issue is present in r0p0 as well but there is no workaround for that revision. It is still open.

  • ERRATA_V1_2139242: This applies errata 2139242 workaround to Neoverse-V1 CPU. This needs to be enabled for revisions r0p0, r1p0, and r1p1 of the CPU. It is still open.

  • ERRATA_V1_2108267: This applies errata 2108267 workaround to Neoverse-V1 CPU. This needs to be enabled for revisions r0p0, r1p0, and r1p1 of the CPU. It is still open.

  • ERRATA_V1_2216392: This applies errata 2216392 workaround to Neoverse-V1 CPU. This needs to be enabled for revisions r1p0 and r1p1 of the CPU, the issue is present in r0p0 as well but there is no workaround for that revision. It is still open.

  • ERRATA_V1_2294912: This applies errata 2294912 workaround to Neoverse-V1 CPU. This needs to be enabled for revisions r0p0, r1p0, and r1p1 and r1p2 of the CPU.

  • ERRATA_V1_2348377: This applies errata 2348377 workaroud to Neoverse-V1 CPU. This needs to be enabled for revisions r0p0, r1p0 and r1p1 of the CPU. It has been fixed in r1p2.

  • ERRATA_V1_2372203: This applies errata 2372203 workaround to Neoverse-V1 CPU. This needs to be enabled for revisions r0p0, r1p0 and r1p1 of the CPU. It is still open.

  • ERRATA_V1_2701953: This applies erratum 2701953 workaround to Neoverse-V1

    CPU, this erratum affects system configurations that do not use an ARM interconnect IP. This needs to be enabled for revisions r0p0, r1p0 and r1p1. It has been fixed in r1p2.

  • ERRATA_V1_2743093: This applies errata 2743093 workaround to Neoverse-V1 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 of the CPU. It is still open.

  • ERRATA_V1_2743233: This applies erratum 2743233 workaround to Neoverse-V1 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, and r1p2 of the CPU. It is still open.

  • ERRATA_V1_2779461: This applies erratum 2779461 workaround to Neoverse-V1 CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1, r1p2 of the CPU. It is still open.

For Neoverse V2, the following errata build flags are defined :

  • ERRATA_V2_2331132: This applies errata 2331132 workaround to Neoverse-V2 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. It is still open.

  • ERRATA_V2_2618597: This applies errata 2618597 workaround to Neoverse-V2 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2.

  • ERRATA_V2_2662553: This applies errata 2662553 workaround to Neoverse-V2 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2.

  • ERRATA_V2_2719103: This applies errata 2719103 workaround to Neoverse-V2 CPU, this affects system configurations that do not use and ARM interconnect IP. This needs to be enabled for revisions r0p0 and r0p1. It has been fixed in r0p2.

  • ERRATA_V2_2719105: This applies errata 2719105 workaround to Neoverse-V2 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2.

  • ERRATA_V2_2743011: This applies errata 2743011 workaround to Neoverse-V2 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2.

  • ERRATA_V2_2779510: This applies errata 2779510 workaround to Neoverse-V2 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2.

  • ERRATA_V2_2801372: This applies errata 2801372 workaround to Neoverse-V2 CPU, this affects all configurations. This needs to be enabled for revisions r0p0 and r0p1. It has been fixed in r0p2.

For Cortex-A710, the following errata build flags are defined :

  • ERRATA_A710_1987031: This applies errata 1987031 workaround to Cortex-A710 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the CPU. It is still open.

  • ERRATA_A710_2081180: This applies errata 2081180 workaround to Cortex-A710 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the CPU. It is still open.

  • ERRATA_A710_2055002: This applies errata 2055002 workaround to Cortex-A710 CPU. This needs to be enabled for revisions r1p0, r2p0 of the CPU and is still open.

  • ERRATA_A710_2017096: This applies errata 2017096 workaround to Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 of the CPU and is still open.

  • ERRATA_A710_2083908: This applies errata 2083908 workaround to Cortex-A710 CPU. This needs to be enabled for revision r2p0 of the CPU and is still open.

  • ERRATA_A710_2058056: This applies errata 2058056 workaround to Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 and r2p1 of the CPU and is still open.

  • ERRATA_A710_2267065: This applies errata 2267065 workaround to Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 of the CPU and is fixed in r2p1.

  • ERRATA_A710_2136059: This applies errata 2136059 workaround to Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 of the CPU and is fixed in r2p1.

  • ERRATA_A710_2147715: This applies errata 2147715 workaround to Cortex-A710 CPU. This needs to be enabled for revision r2p0 of the CPU and is fixed in r2p1.

  • ERRATA_A710_2216384: This applies errata 2216384 workaround to Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 of the CPU and is fixed in r2p1.

  • ERRATA_A710_2282622: This applies errata 2282622 workaround to Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the CPU and is still open.

  • ERRATA_A710_2291219: This applies errata 2291219 workaround to

    Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 of the CPU and is fixed in r2p1.

  • ERRATA_A710_2008768: This applies errata 2008768 workaround to Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 of the CPU and is fixed in r2p1.

  • ERRATA_A710_2371105: This applies errata 2371105 workaround to Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 of the CPU and is fixed in r2p1.

  • ERRATA_A710_2701952: This applies erratum 2701952 workaround to Cortex-A710 CPU, and applies to system configurations that do not use and ARM interconnect IP. This needs to be enabled for r0p0, r1p0, r2p0 and r2p1 and is still open.

  • ERRATA_A710_2742423: This applies errata 2742423 workaround to Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the CPU and is still open.

  • ERRATA_A710_2768515: This applies errata 2768515 workaround to Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the CPU and is still open.

  • ERRATA_A710_2778471: This applies errata 2778471 workaround to Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the CPU and is still open.

For Neoverse N2, the following errata build flags are defined :

  • ERRATA_N2_2002655: This applies errata 2002655 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.

  • ERRATA_N2_2009478: This applies errata 2009478 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.

  • ERRATA_N2_2067956: This applies errata 2067956 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.

  • ERRATA_N2_2025414: This applies errata 2025414 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.

  • ERRATA_N2_2189731: This applies errata 2189731 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.

  • ERRATA_N2_2138956: This applies errata 2138956 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.

  • ERRATA_N2_2138953: This applies errata 2138953 workaround to Neoverse-N2 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2, r0p3 and is still open.

  • ERRATA_N2_2242415: This applies errata 2242415 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.

  • ERRATA_N2_2138958: This applies errata 2138958 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.

  • ERRATA_N2_2242400: This applies errata 2242400 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.

  • ERRATA_N2_2280757: This applies errata 2280757 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0 of the CPU and is fixed in r0p1.

  • ERRATA_N2_2326639: This applies errata 2326639 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in r0p1.

  • ERRATA_N2_2340933: This applies errata 2340933 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in r0p1.

  • ERRATA_N2_2346952: This applies errata 2346952 workaround to Neoverse-N2 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2 of the CPU, it is fixed in r0p3.

  • ERRATA_N2_2376738: This applies errata 2376738 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0, r0p1, r0p2, r0p3 and is still open.

  • ERRATA_N2_2388450: This applies errata 2388450 workaround to Neoverse-N2 CPU. This needs to be enabled for revision r0p0 of the CPU, it is fixed in r0p1.

  • ERRATA_N2_2743014: This applies errata 2743014 workaround to Neoverse-N2 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. It is fixed in r0p3.

  • ERRATA_N2_2743089: This applies errata 2743089 workaround to Neoverse-N2 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. It is fixed in r0p3.

  • ERRATA_N2_2728475: This applies erratum 2728475 workaround to Neoverse-N2

    CPU, this erratum affects system configurations that do not use and ARM interconnect IP. This needs to be enabled for revisions r0p0, r0p1 and r0p2. It is fixed in r0p3.

  • ERRATA_N2_2779511: This applies errata 2779511 workaround to Neoverse-N2 CPU. This needs to be enabled for revisions r0p0, r0p1 and r0p2. It is fixed in r0p3.

For Cortex-X2, the following errata build flags are defined :

  • ERRATA_X2_2002765: This applies errata 2002765 workaround to Cortex-X2 CPU. This needs to be enabled for revisions r0p0, r1p0, and r2p0 of the CPU, it is still open.

  • ERRATA_X2_2058056: This applies errata 2058056 workaround to Cortex-X2 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the CPU, it is still open.

  • ERRATA_X2_2083908: This applies errata 2083908 workaround to Cortex-X2 CPU. This needs to be enabled for revision r2p0 of the CPU, it is still open.

  • ERRATA_X2_2017096: This applies errata 2017096 workaround to Cortex-X2 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the CPU, it is fixed in r2p1.

  • ERRATA_X2_2081180: This applies errata 2081180 workaround to Cortex-X2 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the CPU, it is fixed in r2p1.

  • ERRATA_X2_2216384: This applies errata 2216384 workaround to Cortex-X2 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the CPU, it is fixed in r2p1.

  • ERRATA_X2_2147715: This applies errata 2147715 workaround to Cortex-X2 CPU. This needs to be enabled only for revision r2p0 of the CPU, it is fixed in r2p1.

  • ERRATA_X2_2282622: This applies errata 2282622 workaround to Cortex-X2 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the CPU and is still open.

  • ERRATA_X2_2371105: This applies errata 2371105 workaround to Cortex-X2 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 of the CPU and is fixed in r2p1.

  • ERRATA_X2_2701952: This applies erratum 2701952 workaround to Cortex-X2

    CPU and affects system configurations that do not use an ARM interconnect IP. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 and is still open.

  • ERRATA_X2_2742423: This applies errata 2742423 workaround to Cortex-X2 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the CPU and is still open.

  • ERRATA_X2_2768515: This applies errata 2768515 workaround to Cortex-X2 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the CPU and is still open.

  • ERRATA_X2_2778471: This applies errata 2778471 workaround to Cortex-X2 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the CPU and it is still open.

For Cortex-X3, the following errata build flags are defined :

  • ERRATA_X3_2070301: This applies errata 2070301 workaround to the Cortex-X3 CPU. This needs to be enabled only for revisions r0p0, r1p0, r1p1 and r1p2 of the CPU and is still open.

  • ERRATA_X3_2266875: This applies errata 2266875 workaround to the Cortex-X3 CPU. This needs to be enabled only for revisions r0p0 and r1p0 of the CPU, it is fixed in r1p1.

  • ERRATA_X3_2302506: This applies errata 2302506 workaround to the Cortex-X3 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1, it is fixed in r1p2.

  • ERRATA_X3_2313909: This applies errata 2313909 workaround to Cortex-X3 CPU. This needs to be enabled only for revisions r0p0 and r1p0 of the CPU, it is fixed in r1p1.

  • ERRATA_X3_2372204: This applies errata 2372204 workaround to Cortex-X3 CPU. This needs to be enabled only for revisions r0p0 and r1p0 of the CPU, it is fixed in r1p1.

  • ERRATA_X3_2615812: This applies errata 2615812 workaround to Cortex-X3 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1 of the CPU, it is still open.

  • ERRATA_X3_2641945: This applies errata 2641945 workaround to Cortex-X3 CPU. This needs to be enabled only for revisions r0p0 and r1p0 of the CPU. It is fixed in r1p1.

  • ERRATA_X3_2701951: This applies erratum 2701951 workaround to Cortex-X3 CPU and affects system configurations that do not use an ARM interconnect IP. This needs to be applied to revisions r0p0, r1p0 and r1p1. It is fixed in r1p2.

  • ERRATA_X3_2742421: This applies errata 2742421 workaround to Cortex-X3 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1. It is fixed in r1p2.

  • ERRATA_X3_2743088: This applies errata 2743088 workaround to Cortex-X3 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1. It is fixed in r1p2.

  • ERRATA_X3_2779509: This applies errata 2779509 workaround to Cortex-X3 CPU. This needs to be enabled only for revisions r0p0, r1p0 and r1p1 of the CPU. It is fixed in r1p2.

For Cortex-X4, the following errata build flags are defined :

  • ERRATA_X4_2701112: This applies erratum 2701112 workaround to Cortex-X4 CPU and affects system configurations that do not use an Arm interconnect IP. This needs to be enabled for revisions r0p0 and is fixed in r0p1. The workaround for this erratum is not implemented in EL3, but the flag can be enabled/disabled at the platform level. The flag is used when the errata ABI feature is enabled and can assist the Kernel in the process of mitigation of the erratum.

For Cortex-A510, the following errata build flags are defined :

  • ERRATA_A510_1922240: This applies errata 1922240 workaround to Cortex-A510 CPU. This needs to be enabled only for revision r0p0, it is fixed in r0p1.

  • ERRATA_A510_2288014: This applies errata 2288014 workaround to Cortex-A510 CPU. This needs to be enabled only for revisions r0p0, r0p1, r0p2, r0p3 and r1p0, it is fixed in r1p1.

  • ERRATA_A510_2042739: This applies errata 2042739 workaround to Cortex-A510 CPU. This needs to be enabled only for revisions r0p0, r0p1 and r0p2, it is fixed in r0p3.

  • ERRATA_A510_2041909: This applies errata 2041909 workaround to Cortex-A510 CPU. This needs to be enabled only for revision r0p2 and is fixed in r0p3. The issue is also present in r0p0 and r0p1 but there is no workaround for those revisions.

  • ERRATA_A510_2080326: This applies errata 2080326 workaround to Cortex-A510 CPU. This needs to be enabled only for revision r0p2 and is fixed in r0p3. This issue is also present in r0p0 and r0p1 but there is no workaround for those revisions.

  • ERRATA_A510_2250311: This applies errata 2250311 workaround to Cortex-A510 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2, r0p3 and r1p0, it is fixed in r1p1. This workaround disables MPMM even if ENABLE_MPMM=1.

  • ERRATA_A510_2218950: This applies errata 2218950 workaround to Cortex-A510 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2, r0p3 and r1p0, it is fixed in r1p1.

  • ERRATA_A510_2172148: This applies errata 2172148 workaround to Cortex-A510 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2, r0p3 and r1p0, it is fixed in r1p1.

  • ERRATA_A510_2347730: This applies errata 2347730 workaround to Cortex-A510 CPU. This needs to be enabled for revisions r0p0, r0p1, r0p2, r0p3, r1p0 and r1p1. It is fixed in r1p2.

  • ERRATA_A510_2371937: This applies errata 2371937 workaround to Cortex-A510 CPU. This needs to applied for revisions r0p0, r0p1, r0p2, r0p3, r1p0, r1p1, and is fixed in r1p2.

  • ERRATA_A510_2666669: This applies errata 2666669 workaround to Cortex-A510 CPU. This needs to applied for revisions r0p0, r0p1, r0p2, r0p3, r1p0, r1p1. It is fixed in r1p2.

  • ERRATA_A510_2684597: This applies erratum 2684597 workaround to Cortex-A510 CPU. This needs to be applied to revision r0p0, r0p1, r0p2, r0p3, r1p0, r1p1 and r1p2. It is fixed in r1p3.

For Cortex-A520, the following errata build flags are defined :

  • ERRATA_A520_2630792: This applies errata 2630792 workaround to Cortex-A520 CPU. This needs to applied for revisions r0p0, r0p1 of the CPU and is still open.

  • ERRATA_A520_2858100: This applies errata 2858100 workaround to Cortex-A520 CPU. This needs to be enabled for revisions r0p0 and r0p1. It is still open.

For Cortex-A715, the following errata build flags are defined :

  • ERRATA_A715_2331818: This applies errata 2331818 workaround to Cortex-A715 CPU. This needs to be enabled for revisions r0p0 and r1p0. It is fixed in r1p1.

  • ERRATA_A715_2344187: This applies errata 2344187 workaround to

    Cortex-A715 CPU. This needs to be enabled for revisions r0p0 and r1p0. It is fixed in r1p1.

  • ERRATA_A715_2413290: This applies errata 2413290 workaround to Cortex-A715 CPU. This needs to be enabled only for revision r1p0 and when SPE(Statistical profiling extension)=True. The errata is fixed in r1p1.

  • ERRATA_A715_2420947: This applies errata 2420947 workaround to Cortex-A715 CPU. This needs to be enabled only for revision r1p0. It is fixed in r1p1.

  • ERRATA_A715_2429384: This applies errata 2429384 workaround to Cortex-A715 CPU. This needs to be enabled for revision r1p0. There is no workaround for revision r0p0. It is fixed in r1p1.

  • ERRATA_A715_2561034: This applies errata 2561034 workaround to Cortex-A715 CPU. This needs to be enabled only for revision r1p0. It is fixed in r1p1.

5.3.3. DSU Errata Workarounds

Similar to CPU errata, TF-A also implements workarounds for DSU (DynamIQ Shared Unit) errata. The DSU errata details can be found in the respective Arm documentation:

Each erratum is identified by an ID, as defined in the DSU errata notice document. Thus, the build flags which enable/disable the errata workarounds have the format ERRATA_DSU_<ID>. The implementation and application logic of DSU errata workarounds are similar to CPU errata workarounds.

For DSU errata, the following build flags are defined:

  • ERRATA_DSU_798953: This applies errata 798953 workaround for the affected DSU configurations. This errata applies only for those DSUs that revision is r0p0 (on r0p1 it is fixed). However, please note that this workaround results in increased DSU power consumption on idle.

  • ERRATA_DSU_936184: This applies errata 936184 workaround for the affected DSU configurations. This errata applies only for those DSUs that contain the ACP interface and the DSU revision is older than r2p0 (on r2p0 it is fixed). However, please note that this workaround results in increased DSU power consumption on idle.

  • ERRATA_DSU_2313941: This applies errata 2313941 workaround for the affected DSU configurations. This errata applies for those DSUs with revisions r0p0, r1p0, r2p0, r2p1, r3p0, r3p1 and is still open. However, please note that this workaround results in increased DSU power consumption on idle.

5.3.4. CPU Specific optimizations

This section describes some of the optimizations allowed by the CPU micro architecture that can be enabled by the platform as desired.

  • SKIP_A57_L1_FLUSH_PWR_DWN: This flag enables an optimization in the Cortex-A57 cluster power down sequence by not flushing the Level 1 data cache. The L1 data cache and the L2 unified cache are inclusive. A flush of the L2 by set/way flushes any dirty lines from the L1 as well. This is a known safe deviation from the Cortex-A57 TRM defined power down sequence. Each Cortex-A57 based platform must make its own decision on whether to use the optimization.

  • A53_DISABLE_NON_TEMPORAL_HINT: This flag disables the cache non-temporal hint. The LDNP/STNP instructions as implemented on Cortex-A53 do not behave in a way most programmers expect, and will most probably result in a significant speed degradation to any code that employs them. The Armv8-A architecture (see Arm DDI 0487A.h, section D3.4.3) allows cores to ignore the non-temporal hint and treat LDNP/STNP as LDP/STP instead. Enabling this flag enforces this behaviour. This needs to be enabled only for revisions <= r0p3 of the CPU and is enabled by default.

  • A57_DISABLE_NON_TEMPORAL_HINT: This flag has the same behaviour as A53_DISABLE_NON_TEMPORAL_HINT but for Cortex-A57. This needs to be enabled only for revisions <= r1p2 of the CPU and is enabled by default, as recommended in section “4.7 Non-Temporal Loads/Stores” of the Cortex-A57 Software Optimization Guide.

  • ‘’A57_ENABLE_NON_CACHEABLE_LOAD_FWD’’: This flag enables non-cacheable

    streaming enhancement feature for Cortex-A57 CPUs. Platforms can set this bit only if their memory system meets the requirement that cache line fill requests from the Cortex-A57 processor are atomic. Each Cortex-A57 based platform must make its own decision on whether to use the optimization. This flag is disabled by default.

  • NEOVERSE_Nx_EXTERNAL_LLC: This flag indicates that an external last level cache(LLC) is present in the system, and that the DataSource field on the master CHI interface indicates when data is returned from the LLC. This is used to control how the LL_CACHE* PMU events count. Default value is 0 (Disabled).

5.3.5. GIC Errata Workarounds

  • GIC600_ERRATA_WA_2384374: This flag applies part 2 of errata 2384374 workaround for the affected GIC600 and GIC600-AE implementations. It applies to implementations of GIC600 and GIC600-AE with revisions less than or equal to r1p6 and r0p2 respectively. If the platform sets GICV3_SUPPORT_GIC600, then this flag is enabled; otherwise, it is 0 (Disabled).


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