[PATCH 3/3] ARM: s3c: Bring back notes from removed debug-macro.S

Krzysztof Kozlowski
2020-09-11T15:29:11Z

Documentation references notes from a removed debug-macro.S file so
bring the contents here.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---
arch/arm/mach-s3c/s3c64xx.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-s3c/s3c64xx.c b/arch/arm/mach-s3c/s3c64xx.c
index b5fc615a482f..4dfb648142f2 100644
--- a/arch/arm/mach-s3c/s3c64xx.c
+++ b/arch/arm/mach-s3c/s3c64xx.c
@@ -95,7 +95,12 @@ 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 = {
--
2.17.1