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ARM: EXYNOS: fix CONFIG_DEBUG_LL 

addruart cannot read from the physical address of the chipid
register, that will fail as soon as the mmu is turned on.
Fixing it to read from the physical or virtual address depending
on the mmu state also does not work, because there is a period
between head.S and exynos_map_io where the mmu is on, the uart
is mapped and used, but the chipid mapping is not yet present.

Fix addruart to use the ARM Main ID cp15 register to determine
if the core is Cortex A15 (EXYNOS5) or not (EXYNOS4).

Signed-off-by: Colin Cross <ccross@android.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Colin Cross 2012-04-04 09:27:19 -07:00 committed by Kukjin Kim
parent 8551f3ff49
commit fd9abe1b5b
1 changed files with 3 additions and 4 deletions
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7
arch/arm/mach-exynos/include/mach/debug-macro.S
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@ -21,10 +21,9 @@
*/
.macro addruart, rp, rv, tmp
mov \rp, #0x10000000
ldr \rp, [\rp, #0x0]
and \rp, \rp, #0xf00000
teq \rp, #0x500000 @@ EXYNOS5
mrc p15, 0, \tmp, c0, c0, 0
and \tmp, \tmp, #0xf0
teq \tmp, #0xf0 @@ A15
ldreq \rp, =EXYNOS5_PA_UART
movne \rp, #EXYNOS4_PA_UART @@ EXYNOS4
ldr \rv, =S3C_VA_UART