In message 20040224162652.7167.qmail@web10606.mail.yahoo.com you wrote:
We have ported U-boot and Linux to a custom 8280 board. For this board, the LED base has been set at 0x2200A000. I am able to write to this base from U-boot using mw command and control the LED display. But if I try to access the same memory from Linux, the kernel is raising an exception. I even tried to map
This is not a U-Boot related question. It is thus off topic on this list.
this memory area by calling ioremap in MMU_init but the result was same. Do I have to do any other
...
Oops: kernel access of bad area, sig: 11 NIP: C0139034 XER: 00000000 LR: C0139024 SP: C05B9F90 REGS: c05b9ee0 TRAP: 0300 Not tainted MSR: 00009032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11 DAR: 2200A000, DSISR: 22000000
^^^^^^^^^^^^^^^
I think that this address was not mapped by the Linux kernel. Check you code again. Also, please reconsider your memory map - see http://www.denx.de/twiki/bin/view/PPCEmbedded/Kernel#Section_10.2.
Best regards,
Wolfgang Denk