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194 lines
14 KiB
194 lines
14 KiB
======================================= |
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Silicon Errata and Software Workarounds |
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======================================= |
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Author: Will Deacon <[email protected]> |
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Date : 27 November 2015 |
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It is an unfortunate fact of life that hardware is often produced with |
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so-called "errata", which can cause it to deviate from the architecture |
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under specific circumstances. For hardware produced by ARM, these |
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errata are broadly classified into the following categories: |
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|
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========== ======================================================== |
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Category A A critical error without a viable workaround. |
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Category B A significant or critical error with an acceptable |
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workaround. |
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Category C A minor error that is not expected to occur under normal |
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operation. |
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========== ======================================================== |
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For more information, consult one of the "Software Developers Errata |
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Notice" documents available on infocenter.arm.com (registration |
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required). |
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As far as Linux is concerned, Category B errata may require some special |
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treatment in the operating system. For example, avoiding a particular |
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sequence of code, or configuring the processor in a particular way. A |
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less common situation may require similar actions in order to declassify |
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a Category A erratum into a Category C erratum. These are collectively |
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known as "software workarounds" and are only required in the minority of |
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cases (e.g. those cases that both require a non-secure workaround *and* |
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can be triggered by Linux). |
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For software workarounds that may adversely impact systems unaffected by |
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the erratum in question, a Kconfig entry is added under "Kernel |
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Features" -> "ARM errata workarounds via the alternatives framework". |
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These are enabled by default and patched in at runtime when an affected |
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CPU is detected. For less-intrusive workarounds, a Kconfig option is not |
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available and the code is structured (preferably with a comment) in such |
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a way that the erratum will not be hit. |
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This approach can make it slightly onerous to determine exactly which |
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errata are worked around in an arbitrary kernel source tree, so this |
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file acts as a registry of software workarounds in the Linux Kernel and |
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will be updated when new workarounds are committed and backported to |
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stable kernels. |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Implementor | Component | Erratum ID | Kconfig | |
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+================+=================+=================+=============================+ |
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| Allwinner | A64/R18 | UNKNOWN1 | SUN50I_ERRATUM_UNKNOWN1 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A510 | #2064142 | ARM64_ERRATUM_2064142 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A510 | #2038923 | ARM64_ERRATUM_2038923 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A510 | #1902691 | ARM64_ERRATUM_1902691 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A53 | #826319 | ARM64_ERRATUM_826319 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A53 | #827319 | ARM64_ERRATUM_827319 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A53 | #824069 | ARM64_ERRATUM_824069 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A53 | #819472 | ARM64_ERRATUM_819472 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A53 | #845719 | ARM64_ERRATUM_845719 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A53 | #843419 | ARM64_ERRATUM_843419 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A55 | #1024718 | ARM64_ERRATUM_1024718 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A55 | #1530923 | ARM64_ERRATUM_1530923 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A57 | #832075 | ARM64_ERRATUM_832075 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A57 | #852523 | N/A | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A57 | #834220 | ARM64_ERRATUM_834220 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A57 | #1319537 | ARM64_ERRATUM_1319367 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A72 | #853709 | N/A | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A72 | #1319367 | ARM64_ERRATUM_1319367 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A73 | #858921 | ARM64_ERRATUM_858921 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A76 | #1188873,1418040| ARM64_ERRATUM_1418040 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A76 | #1165522 | ARM64_ERRATUM_1165522 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A76 | #1286807 | ARM64_ERRATUM_1286807 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A76 | #1463225 | ARM64_ERRATUM_1463225 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A77 | #1508412 | ARM64_ERRATUM_1508412 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A510 | #2051678 | ARM64_ERRATUM_2051678 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A510 | #2077057 | ARM64_ERRATUM_2077057 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A710 | #2119858 | ARM64_ERRATUM_2119858 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A710 | #2054223 | ARM64_ERRATUM_2054223 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-A710 | #2224489 | ARM64_ERRATUM_2224489 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-X2 | #2119858 | ARM64_ERRATUM_2119858 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Cortex-X2 | #2224489 | ARM64_ERRATUM_2224489 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Neoverse-N1 | #1188873,1418040| ARM64_ERRATUM_1418040 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Neoverse-N1 | #1349291 | N/A | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Neoverse-N1 | #1542419 | ARM64_ERRATUM_1542419 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Neoverse-N2 | #2139208 | ARM64_ERRATUM_2139208 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Neoverse-N2 | #2067961 | ARM64_ERRATUM_2067961 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | Neoverse-N2 | #2253138 | ARM64_ERRATUM_2253138 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| ARM | MMU-500 | #841119,826419 | N/A | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_845719 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Broadcom | Brahma-B53 | N/A | ARM64_ERRATUM_843419 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Cavium | ThunderX ITS | #22375,24313 | CAVIUM_ERRATUM_22375 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Cavium | ThunderX ITS | #23144 | CAVIUM_ERRATUM_23144 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Cavium | ThunderX GICv3 | #23154,38545 | CAVIUM_ERRATUM_23154 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Cavium | ThunderX GICv3 | #38539 | N/A | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Cavium | ThunderX Core | #27456 | CAVIUM_ERRATUM_27456 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Cavium | ThunderX Core | #30115 | CAVIUM_ERRATUM_30115 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Cavium | ThunderX SMMUv2 | #27704 | N/A | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Cavium | ThunderX2 SMMUv3| #74 | N/A | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Cavium | ThunderX2 SMMUv3| #126 | N/A | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Cavium | ThunderX2 Core | #219 | CAVIUM_TX2_ERRATUM_219 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Marvell | ARM-MMU-500 | #582743 | N/A | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| NVIDIA | Carmel Core | N/A | NVIDIA_CARMEL_CNP_ERRATUM | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Freescale/NXP | LS2080A/LS1043A | A-008585 | FSL_ERRATUM_A008585 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Hisilicon | Hip0{5,6,7} | #161010101 | HISILICON_ERRATUM_161010101 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Hisilicon | Hip0{6,7} | #161010701 | N/A | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Hisilicon | Hip0{6,7} | #161010803 | N/A | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Hisilicon | Hip07 | #161600802 | HISILICON_ERRATUM_161600802 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Hisilicon | Hip08 SMMU PMCG | #162001800 | N/A | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Qualcomm Tech. | Kryo/Falkor v1 | E1003 | QCOM_FALKOR_ERRATUM_1003 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Qualcomm Tech. | Kryo/Falkor v1 | E1009 | QCOM_FALKOR_ERRATUM_1009 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Qualcomm Tech. | QDF2400 ITS | E0065 | QCOM_QDF2400_ERRATUM_0065 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Qualcomm Tech. | Falkor v{1,2} | E1041 | QCOM_FALKOR_ERRATUM_1041 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Qualcomm Tech. | Kryo4xx Gold | N/A | ARM64_ERRATUM_1463225 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Qualcomm Tech. | Kryo4xx Gold | N/A | ARM64_ERRATUM_1418040 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Qualcomm Tech. | Kryo4xx Silver | N/A | ARM64_ERRATUM_1530923 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Qualcomm Tech. | Kryo4xx Silver | N/A | ARM64_ERRATUM_1024718 | |
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+----------------+-----------------+-----------------+-----------------------------+ |
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+----------------+-----------------+-----------------+-----------------------------+ |
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| Fujitsu | A64FX | E#010001 | FUJITSU_ERRATUM_010001 | |
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+----------------+-----------------+-----------------+-----------------------------+
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