Commit f71cbfe3 authored by Nitin Garg's avatar Nitin Garg Committed by Stefano Babic
Browse files

ARM: Add workaround for Cortex-A9 errata 794072

A short loop including a DMB instruction might cause a denial of
service on another processor which executes a CP15 broadcast operation.
Exists on r1, r2, r3, r4 revisions.
Signed-off-by: default avatarNitin Garg <>
Acked-by: default avatarDirk Behme <>
parent 1a9df13d
......@@ -566,6 +566,7 @@ The following options need to be configured:
If set, the workarounds for these ARM errata are applied early
during U-Boot startup. Note that these options force the
......@@ -205,7 +205,7 @@ ENTRY(cpu_init_cp15)
mcr p15, 0, r0, c1, c0, 0 @ write system control register
#ifdef CONFIG_ARM_ERRATA_742230
#if (defined(CONFIG_ARM_ERRATA_742230) || defined(CONFIG_ARM_ERRATA_794072))
mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
orr r0, r0, #1 << 4 @ set bit #4
mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment