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Check presence of fix for errata 835769 in Cortex-A53 

A fix for errata 835769 may be available in revisions r0p2, r0p3 or r0p4
of the Cortex-A53 processor. The presence of the fix is determined by
checking bit 7 in the REVIDR register.

If the fix is present we report ERRATA_NOT_APPLIES which silences the
erroneous 'missing workaround' warning.

Change-Id: Ib75b008e755e9ac648554ca9398024fdbea4a91a
Signed-off-by: Jonathan Wright <jonathan.wright@arm.com>
This commit is contained in:
Jonathan Wright 2018-03-28 16:55:54 +01:00
parent 9ec3921c02
commit fe634fa62f
1 changed files with 17 additions and 2 deletions
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19
lib/cpus/aarch64/cortex_a53.S
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@ -145,8 +145,23 @@ endfunc check_errata_855873
* This workaround is statically enabled at build time.
*/
func check_errata_835769
mov x1, #0x04
b cpu_rev_var_ls
cmp x0, #0x04
b.hi errata_not_applies
/*
* Fix potentially available for revisions r0p2, r0p3 and r0p4.
* If r0p2, r0p3 or r0p4; check for fix in REVIDR, else exit.
*/
cmp x0, #0x01
mov x0, #ERRATA_APPLIES
b.ls exit_check_errata_835769
/* Load REVIDR. */
mrs x1, revidr_el1
/* If REVIDR[7] is set (fix exists) set ERRATA_NOT_APPLIES, else exit. */
tbz x1, #7, exit_check_errata_835769
errata_not_applies:
mov x0, #ERRATA_NOT_APPLIES
exit_check_errata_835769:
ret
endfunc check_errata_835769
/*