Hi All
I am working on a customized board which has S3C2410 as its processor.
I have applied the following Linux patches patch-2.4.18-rmk6 and 
patch-2.4.18-RMK6-SWL5.
There are  two types of custom hardware with me. One has 64MB contiguous
SDRAM and the other has 32 MB with following discontiguous physical 
memory  map.

1. 0x30000000 to 0x307fffff size is 8MB
2. 0x31000000 to 0x317fffff size is 8MB
3. 0x32000000 to 0x327fffff size is 8MB
4. 0x33000000 to 0x337fffff size is 8MB

RAMDISK location 0x31000000 (Maximum size is 7 MB) and ZIMAGE
location 0x31700000

In the 64 MB hardware, Linux runs without any issues. Because the patch is
for 64MB  contiguous memory. I am able to boot the 32 MB hardware 
with the same kernel used for 64MB. But in 32MB hardware, it crashes 
when I  run some of our applications. I assume that this is because the 
kernel is not configured for the discontiguous memory map.

I did the following changes to support discontiguous memory.

1. I changed the MEM_SIZE macro to 32 * 1024 * 1024
(include/as/arch/s3c2410.h)
2. Changed the macros in the include/asm/arch/memory.h
3. modified the fixup_s3c2410 () function in 
arch/arm/mach-s3c2410/arch.c to support 4 memory banks.
4. Enabled CONFIG_DISCONTIGMEM option

After doing the above changes, Linux crashes during the bootup.
Is my understanding correct ?
I have attached the modified files.
Any help regarding the discontiguous memory configuration will be grateful.

Thanking you in advance.

Regards
Aman