[PATCH v4 05/12] ARM: EXYNOS: add support uart for EXYNOS4 and EXYNOS5

[Thomas Abraham]

On 14 March 2012 20:12, Kukjin Kim <kgene.kim at samsung.com> wrote:
> Actually, the base address of uart is different between EXYNOS4
> and EXYNOS5 and this patch enables to support uart for EXYNOS4
> and EXYNOS5 SoCs at runtime.
>
> Signed-off-by: Kukjin Kim <kgene.kim at samsung.com>
> ---

[...]

> diff --git a/arch/arm/mach-exynos/include/mach/debug-macro.S b/arch/arm/mach-exynos/include/mach/debug-macro.S
> index 6cacf16..6c857ff 100644
> --- a/arch/arm/mach-exynos/include/mach/debug-macro.S
> +++ b/arch/arm/mach-exynos/include/mach/debug-macro.S
> @@ -21,8 +21,13 @@
>         */
>
>        .macro addruart, rp, rv, tmp
> -               ldr     \rp, = S3C_PA_UART
> -               ldr     \rv, = S3C_VA_UART
> +               mov     \rp, #0x10000000

This is physical address of Exynos4/5 CPUID register which cannot be
used here. And virtual address S5P_VA_CPUID also cannot be used here
since this will be called before paging_init when earlyprintk boot
param is used. So, with this change, earlyprintk does not work for
both Exynos4 and Exynos5.

Thanks,
Thomas.