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ARM: imx: replicate the diagnostic register of boot cpu into secondary cores

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The diagnostic register holds the errata bits.  Mostly bootloader
does not bring up secondary cores, so that when errata bits are set
in bootloader, they are set only for boot cpu.  But on a SMP
configuration, it should be equally done on every single core.
Set up the diagnostic register for secondary cores by replicating
the register from boot cpu.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Dirk Behme <dirk.behme@de.bosch.com>
This commit is contained in:
Shawn Guo
2013-04-16 22:11:19 +08:00
parent 0e574461c4
commit 087bb28329
2 changed files with 26 additions and 0 deletions
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12
arch/arm/mach-imx/headsmp.S
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@@ -18,8 +18,20 @@
.section ".text.head", "ax"
#ifdef CONFIG_SMP
diag_reg_offset:
.word g_diag_reg - .
.macro set_diag_reg
adr r0, diag_reg_offset
ldr r1, [r0]
add r1, r1, r0 @ r1 = physical &g_diag_reg
ldr r0, [r1]
mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
.endm
ENTRY(v7_secondary_startup)
bl v7_invalidate_l1
set_diag_reg
b secondary_startup
ENDPROC(v7_secondary_startup)
#endif