Re: [PATCH] ARM: SAMSUNG: Fix for S3C2412 EBI memory mapping.

From: Josà Miguel GonÃalves
Date: Thu May 10 2012 - 09:49:09 EST

On 10-05-2012 10:25, Kukjin Kim wrote:
Josà Miguel GonÃalves wrote:
While upgrading the kernel on a S3C2412 based board I've noted that it was
impossible to boot the board with a 2.6.32 or upper kernel.
I've tracked down the problem to the EBI virtual memory mapping that is in
conflict with the IO mapping definition in arch/arm/mach-s3c24xx/s3c2412.c.

Signed-off-by: Josà Miguel GonÃalves<jose.goncalves@xxxxxxx>
arch/arm/plat-samsung/include/plat/map-s3c.h | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/arm/plat-samsung/include/plat/map-s3c.h b/arch/arm/plat-
index 7d04875..c0c70a8 100644
--- a/arch/arm/plat-samsung/include/plat/map-s3c.h
+++ b/arch/arm/plat-samsung/include/plat/map-s3c.h
@@ -22,7 +22,7 @@

#define S3C2412_VA_SSMC S3C_ADDR_CPU(0x00000000)
-#define S3C2412_VA_EBI S3C_ADDR_CPU(0x00010000)
+#define S3C2412_VA_EBI S3C_ADDR_CPU(0x00100000)

#define S3C2410_PA_UART (0x50000000)
#define S3C24XX_PA_UART S3C2410_PA_UART
Yeah, as you said, the mapping for SSMC invade EBI area but I think, just SZ_4K is enough for SSMC. So following is better in this case. How do you think? And there is no problem on your board?

diff --git a/arch/arm/mach-s3c24xx/s3c2412.c b/arch/arm/mach-s3c24xx/s3c2412.c
index d4bc7f9..ac906bf 100644
--- a/arch/arm/mach-s3c24xx/s3c2412.c
+++ b/arch/arm/mach-s3c24xx/s3c2412.c
@@ -72,7 +72,7 @@ static struct map_desc s3c2412_iodesc[] __initdata = {
.virtual = (unsigned long)S3C2412_VA_SSMC,
.pfn = __phys_to_pfn(S3C2412_PA_SSMC),
- .length = SZ_1M,
+ .length = SZ_4K,
.type = MT_DEVICE,

It does not work! I tried also a 64K length and also did not work. With your patch my console (with earlyprintk set) only displays the following:

## Booting image at 30800000 ...
Image Name: Linux-3.2.16-inov1
Created: 2012-05-10 12:42:49 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1202592 Bytes = 1.1 MB
Load Address: 30008000
Entry Point: 30008000
Verifying Checksum ... OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
Linux version 3.2.16-inov1 (jmpg@st-ze) (gcc version 4.6.4 20120402 (prerelease) (crosstool-NG 1.15.2) ) #3 PREEMPT Thu May 10 13:42:48 WEST 2012
CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177
CPU: VIVT data cache, VIVT instruction cache
Machine: SMDK2412
bootconsole [earlycon0] enabled
Memory policy: ECC disabled, Data cache writeback
CPU S3C2412 (id 0x32412003)

My guess is that the MMU initialization on the S3C2412 chip only allows a minimum of 1MB for the page size.

Best regards,
Josà GonÃalves

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