Hi, On Wed, Mar 14, 2012 at 8:51 AM, pcuser p <pcuser.mails@gmail.com> wrote:

I'm doing kernel porting to arm926 based FPGA board,very minimal setup. Only UART and timer devices are available as part of FPGA.

Below are the details #define PLAT_PHYS_OFFSET       0x80000000 (with 128 MB SDRAM) #define CONFIG_PAGE_OFFSET  0xc0000000

Kernel command parameter has 64MB for mem (mem=64M)

Memory layout:

0xc000_0000 - 0xc800_0000 (128MB virtual mapped SDRAM) initramfs from 0xC200_0000 - 0xC280_0000 (8MB) vmalloc is used from 0xc400_0000 - 0xc800_0000

CONFIG_HIGH_MEM not used

device registers are accessed by using ioremap() calls

If I enable data cache and debug with JTAG, Kernel ends up in data abort exception vector address after paging_init() call.

You should include the full output of the abort. What we really need to see is the address that the abort is complaining about. Generally, it's one of the device registers not being mapped in properly (either for your timer or your UART). If you let the code continue to run, it should write the exception message into the log buffer, which you can find in __log_buf -- Dave Hylands Shuswap, BC, Canada http://www.davehylands.com