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fix(cpus): workaround for Cortex-X4 erratum 2923985

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Cortex-X4 erratum 2923935 is a Cat B erratum that applies
to all revisions <= r0p1 and is fixed in r0p2.

The workaround is to set CPUACTLR4_EL1[11:10] to 0b11.

SDEN documentation:
https://developer.arm.com/documentation/SDEN-2432808/latest

Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Change-Id: I9207802ad479919a7f77c1271019fa2479e076ee
This commit is contained in:
Arvind Ram Prakash 2024-11-27 15:02:32 -06:00
parent e372c29153
commit cc46166144
3 changed files with 13 additions and 0 deletions
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3
docs/design/cpu-specific-build-macros.rst
View file

@ -843,6 +843,9 @@ For Cortex-X4, the following errata build flags are defined :
- ``ERRATA_X4_2897503``: This applies errata 2897503 workaround to Cortex-X4
CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2.
- ``ERRATA_X4_2923985``: This applies errata 2923985 workaround to Cortex-X4
CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2.
- ``ERRATA_X4_3076789``: This applies errata 3076789 workaround to Cortex-X4
CPU. This needs to be enabled for revisions r0p0 and r0p1. It is fixed in r0p2.

6
lib/cpus/aarch64/cortex_x4.S
View file

@ -75,6 +75,12 @@ workaround_reset_end cortex_x4, ERRATUM(2897503)
check_erratum_ls cortex_x4, ERRATUM(2897503), CPU_REV(0, 1)
workaround_reset_start cortex_x4, ERRATUM(2923985), ERRATA_X4_2923985
sysreg_bit_set CORTEX_X4_CPUACTLR4_EL1, (BIT(11) | BIT(10))
workaround_reset_end cortex_x4, ERRATUM(2923985)
check_erratum_ls cortex_x4, ERRATUM(2923985), CPU_REV(0, 1)
workaround_reset_start cortex_x4, ERRATUM(3076789), ERRATA_X4_3076789
sysreg_bit_set CORTEX_X4_CPUACTLR3_EL1, BIT(14)
sysreg_bit_set CORTEX_X4_CPUACTLR3_EL1, BIT(13)

4
lib/cpus/cpu-ops.mk
View file

@ -843,6 +843,10 @@ CPU_FLAG_LIST += ERRATA_X4_2816013
# to revisions r0p0 and r0p1 of the Cortex-X4 cpu. It is fixed in r0p2.
CPU_FLAG_LIST += ERRATA_X4_2897503
# Flag to apply erratum 2923985 workaround on reset. This erratum applies
# to revisions r0p0 and r0p1 of the Cortex-X4 cpu. It is fixed in r0p2.
CPU_FLAG_LIST += ERRATA_X4_2923985
# Flag to apply erratum 3076789 workaround on reset. This erratum applies
# to revisions r0p0 and r0p1 of the Cortex-X4 cpu. It is fixed in r0p2.
CPU_FLAG_LIST += ERRATA_X4_3076789