silicon-errata.rst



Silicon Errata and Software Workarounds
Author: Will Deacon <will.deacon@arm.com>
Date  : 27 November 2015
It is an unfortunate fact of life that hardware is often produced with
so-called "errata", which can cause it to deviate from the architecture
under specific circumstances.  For hardware produced by ARM, these
errata are broadly classified into the following categories:


Category A
A critical error without a viable workaround.


Category B
A significant or critical error with an acceptable
workaround.


Category C
A minor error that is not expected to occur under normal
operation.


For more information, consult one of the "Software Developers Errata
Notice" documents available on infocenter.arm.com (registration
required).
As far as Linux is concerned, Category B errata may require some special
treatment in the operating system. For example, avoiding a particular
sequence of code, or configuring the processor in a particular way. A
less common situation may require similar actions in order to declassify
a Category A erratum into a Category C erratum. These are collectively
known as "software workarounds" and are only required in the minority of
cases (e.g. those cases that both require a non-secure workaround and
can be triggered by Linux).
For software workarounds that may adversely impact systems unaffected by
the erratum in question, a Kconfig entry is added under "Kernel
Features" -> "ARM errata workarounds via the alternatives framework".
With the exception of workarounds for errata deemed "rare" by Arm, these
are enabled by default and patched in at runtime when an affected CPU is
detected. For less-intrusive workarounds, a Kconfig option is not
available and the code is structured (preferably with a comment) in such
a way that the erratum will not be hit.
This approach can make it slightly onerous to determine exactly which
errata are worked around in an arbitrary kernel source tree, so this
file acts as a registry of software workarounds in the Linux Kernel and
will be updated when new workarounds are committed and backported to
stable kernels.


Implementor
Component
Erratum ID
Kconfig


Allwinner
A64/R18
UNKNOWN1
SUN50I_ERRATUM_UNKNOWN1


Ampere
AmpereOne
AC03_CPU_38
AMPERE_ERRATUM_AC03_CPU_38


ARM
Cortex-A510
#2457168
ARM64_ERRATUM_2457168


ARM
Cortex-A510
#2064142
ARM64_ERRATUM_2064142


ARM
Cortex-A510
#2038923
ARM64_ERRATUM_2038923


ARM
Cortex-A510
#1902691
ARM64_ERRATUM_1902691


ARM
Cortex-A510
#2051678
ARM64_ERRATUM_2051678


ARM
Cortex-A510
#2077057
ARM64_ERRATUM_2077057


ARM
Cortex-A510
#2441009
ARM64_ERRATUM_2441009


ARM
Cortex-A510
#2658417
ARM64_ERRATUM_2658417


ARM
Cortex-A510
#3117295
ARM64_ERRATUM_3117295


ARM
Cortex-A520
#2966298
ARM64_ERRATUM_2966298


ARM
Cortex-A53
#826319
ARM64_ERRATUM_826319


ARM
Cortex-A53
#827319
ARM64_ERRATUM_827319


ARM
Cortex-A53
#824069
ARM64_ERRATUM_824069


ARM
Cortex-A53
#819472
ARM64_ERRATUM_819472


ARM
Cortex-A53
#845719
ARM64_ERRATUM_845719


ARM
Cortex-A53
#843419
ARM64_ERRATUM_843419


ARM
Cortex-A55
#1024718
ARM64_ERRATUM_1024718


ARM
Cortex-A55
#1530923
ARM64_ERRATUM_1530923


ARM
Cortex-A55
#2441007
ARM64_ERRATUM_2441007


ARM
Cortex-A57
#832075
ARM64_ERRATUM_832075


ARM
Cortex-A57
#852523
N/A


ARM
Cortex-A57
#834220
ARM64_ERRATUM_834220


ARM
Cortex-A57
#1319537
ARM64_ERRATUM_1319367


ARM
Cortex-A57
#1742098
ARM64_ERRATUM_1742098


ARM
Cortex-A72
#853709
N/A


ARM
Cortex-A72
#1319367
ARM64_ERRATUM_1319367


ARM
Cortex-A72
#1655431
ARM64_ERRATUM_1742098


ARM
Cortex-A73
#858921
ARM64_ERRATUM_858921


ARM
Cortex-A76
#1188873,1418040
ARM64_ERRATUM_1418040


ARM
Cortex-A76
#1165522
ARM64_ERRATUM_1165522


ARM
Cortex-A76
#1286807
ARM64_ERRATUM_1286807


ARM
Cortex-A76
#1463225
ARM64_ERRATUM_1463225


ARM
Cortex-A76
#1490853
N/A


ARM
Cortex-A77
#1491015
N/A


ARM
Cortex-A77
#1508412
ARM64_ERRATUM_1508412


ARM
Cortex-A710
#2119858
ARM64_ERRATUM_2119858


ARM
Cortex-A710
#2054223
ARM64_ERRATUM_2054223


ARM
Cortex-A710
#2224489
ARM64_ERRATUM_2224489


ARM
Cortex-A715
#2645198
ARM64_ERRATUM_2645198


ARM
Cortex-X1
#1502854
N/A


ARM
Cortex-X2
#2119858
ARM64_ERRATUM_2119858


ARM
Cortex-X2
#2224489
ARM64_ERRATUM_2224489


ARM
Cortex-X4
#3194386
ARM64_ERRATUM_3194386


ARM
Neoverse-N1
#1188873,1418040
ARM64_ERRATUM_1418040


ARM
Neoverse-N1
#1349291
N/A


ARM
Neoverse-N1
#1490853
N/A


ARM
Neoverse-N1
#1542419
ARM64_ERRATUM_1542419


ARM
Neoverse-N2
#2139208
ARM64_ERRATUM_2139208


ARM
Neoverse-N2
#2067961
ARM64_ERRATUM_2067961


ARM
Neoverse-N2
#2253138
ARM64_ERRATUM_2253138


ARM
Neoverse-V1
#1619801
N/A


ARM
Neoverse-V3
#3312417
ARM64_ERRATUM_3194386


ARM
MMU-500
#841119,826419
N/A


ARM
MMU-600
#1076982,1209401
N/A


ARM
MMU-700
#2268618,2812531
N/A


ARM
GIC-700
#2941627
ARM64_ERRATUM_2941627


Broadcom
Brahma-B53
N/A
ARM64_ERRATUM_845719


Broadcom
Brahma-B53
N/A
ARM64_ERRATUM_843419


Cavium
ThunderX ITS
#22375,24313
CAVIUM_ERRATUM_22375


Cavium
ThunderX ITS
#23144
CAVIUM_ERRATUM_23144


Cavium
ThunderX GICv3
#23154,38545
CAVIUM_ERRATUM_23154


Cavium
ThunderX GICv3
#38539
N/A


Cavium
ThunderX Core
#27456
CAVIUM_ERRATUM_27456


Cavium
ThunderX Core
#30115
CAVIUM_ERRATUM_30115


Cavium
ThunderX SMMUv2
#27704
N/A


Cavium
ThunderX2 SMMUv3
#74
N/A


Cavium
ThunderX2 SMMUv3
#126
N/A


Cavium
ThunderX2 Core
#219
CAVIUM_TX2_ERRATUM_219


Marvell
ARM-MMU-500
#582743
N/A


NVIDIA
Carmel Core
N/A
NVIDIA_CARMEL_CNP_ERRATUM


NVIDIA
T241 GICv3/4.x
T241-FABRIC-4
N/A


Freescale/NXP
LS2080A/LS1043A
A-008585
FSL_ERRATUM_A008585


Hisilicon
Hip0{5,6,7}
#161010101
HISILICON_ERRATUM_161010101


Hisilicon
Hip0{6,7}
#161010701
N/A


Hisilicon
Hip0{6,7}
#161010803
N/A


Hisilicon
Hip07
#161600802
HISILICON_ERRATUM_161600802


Hisilicon
Hip08 SMMU PMCG
#162001800
N/A


Hisilicon
Hip08 SMMU PMCG
Hip09 SMMU PMCG
#162001900
N/A


Qualcomm Tech.
Kryo/Falkor v1
E1003
QCOM_FALKOR_ERRATUM_1003


Qualcomm Tech.
Kryo/Falkor v1
E1009
QCOM_FALKOR_ERRATUM_1009


Qualcomm Tech.
QDF2400 ITS
E0065
QCOM_QDF2400_ERRATUM_0065


Qualcomm Tech.
Falkor v{1,2}
E1041
QCOM_FALKOR_ERRATUM_1041


Qualcomm Tech.
Kryo4xx Gold
N/A
ARM64_ERRATUM_1463225


Qualcomm Tech.
Kryo4xx Gold
N/A
ARM64_ERRATUM_1418040


Qualcomm Tech.
Kryo4xx Silver
N/A
ARM64_ERRATUM_1530923


Qualcomm Tech.
Kryo4xx Silver
N/A
ARM64_ERRATUM_1024718


Qualcomm Tech.
Kryo4xx Gold
N/A
ARM64_ERRATUM_1286807


Rockchip
RK3588
#3588001
ROCKCHIP_ERRATUM_3588001


Fujitsu
A64FX
E#010001
FUJITSU_ERRATUM_010001


ASR
ASR8601
#8601001
N/A


Microsoft
Azure Cobalt 100
#2139208
ARM64_ERRATUM_2139208


Microsoft
Azure Cobalt 100
#2067961
ARM64_ERRATUM_2067961


Microsoft
Azure Cobalt 100
#2253138
ARM64_ERRATUM_2253138