arm64: cpufeature: Extend bbml2_noabort support list

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Add below cpus to the midr list, which supports
BBML2_NOABORT.

Cortex A520(AE)
Cortex A715
Cortex A720(AE)
Cortex A725
Neoverse N3
C1-Nano
C1-Pro
C1-Ultra
C1-Premium

C1-Ultra and C1-Premium both suffer from erratum 3683289,
where Break-Before-Make must be followed to avoid a livelock.
For both CPUs, the erratum is fixed from r1p1.
Hence we do not enable BBML2_NOABORT for CPU revisions <= r1p0.

The relevant SDENs are:
* C1-Ultra: https://developer.arm.com/documentation/111077/9-00/
* C1-Premium: https://developer.arm.com/documentation/111078/9-00/

Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Linu Cherian <linu.cherian@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

...

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Linu Cherian 2026-07-23 10:10:30 +05:30 • committed by Will Deacon

parent 357230cb52

commit a7ac604144

2 changed files with 14 additions and 0 deletions

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4

Documentation/arch/arm64/silicon-errata.rst

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10

arch/arm64/kernel/cpufeature.c

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