From 0df3c29f6883facf56ba422dbb060a1ad787f865 Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Fri, 11 Sep 2020 16:33:43 +0200 Subject: ARM: s3c64xx: bring back notes from removed debug-macro.S Documentation references notes from a removed debug-macro.S file so bring the contents here. Signed-off-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20200911143343.498-3-krzk@kernel.org --- arch/arm/mach-s3c64xx/common.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'arch/arm') diff --git a/arch/arm/mach-s3c64xx/common.c b/arch/arm/mach-s3c64xx/common.c index 13e91074308a..cb5aafcd66fb 100644 --- a/arch/arm/mach-s3c64xx/common.c +++ b/arch/arm/mach-s3c64xx/common.c @@ -97,7 +97,12 @@ static struct cpu_table cpu_ids[] __initdata = { /* minimal IO mapping */ -/* see notes on uart map in arch/arm/mach-s3c64xx/include/mach/debug-macro.S */ +/* + * note, for the boot process to work we have to keep the UART + * virtual address aligned to an 1MiB boundary for the L1 + * mapping the head code makes. We keep the UART virtual address + * aligned and add in the offset when we load the value here. + */ #define UART_OFFS (S3C_PA_UART & 0xfffff) static struct map_desc s3c_iodesc[] __initdata = { -- cgit v1.2.3