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>
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@ -145,8 +145,23 @@ endfunc check_errata_855873
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* This workaround is statically enabled at build time.
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* This workaround is statically enabled at build time.
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*/
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*/
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func check_errata_835769
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func check_errata_835769
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mov x1, #0x04
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cmp x0, #0x04
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b cpu_rev_var_ls
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b.hi errata_not_applies
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/*
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* Fix potentially available for revisions r0p2, r0p3 and r0p4.
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* If r0p2, r0p3 or r0p4; check for fix in REVIDR, else exit.
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*/
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cmp x0, #0x01
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mov x0, #ERRATA_APPLIES
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b.ls exit_check_errata_835769
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/* Load REVIDR. */
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mrs x1, revidr_el1
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/* If REVIDR[7] is set (fix exists) set ERRATA_NOT_APPLIES, else exit. */
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tbz x1, #7, exit_check_errata_835769
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errata_not_applies:
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mov x0, #ERRATA_NOT_APPLIES
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exit_check_errata_835769:
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ret
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endfunc check_errata_835769
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endfunc check_errata_835769
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/*
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/*
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