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

From: Krzysztof Kozlowski <[email-masked]>
Date: Fri, 11 Sep 2020 16:33:43 +0200

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

Signed-off-by: Krzysztof Kozlowski <[email-masked]>
---
 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