[U-Boot-Users] U-boot Bus Fault Error while accessing NOR flash

Nikhil Gautam
2008-02-15T17:22:13Z

Hi Everyone,

I am try to use the u-boot to program the NOR flash on my proprietary
board based on AMCC sequoia board. I can boot from 1Gb NAND flash ok
but everytime I try access the last 4K of NOR flash, U-boot gives me
following error and reboots:-

{{{
U-Boot$ md 0xFFFFF000
fffff000:Bus Fault @ 0x00000000, fixup 0x00000000
Machine check in kernel mode.
Caused by (from msr): regs 0fe8fca8 Unknown values in msr
NIP: 00000000 XER: 20000000 LR: 0FF6412C REGS: 0fe8fca8 TRAP: 0200 DAR:
041F0000
MSR: 00000000 EE: 0 PR: 0 FP: 0 ME: 0 IR/DR: 00

GPR00: 0FF6412C 0FE8FD98 7FFFFFFF EF600300 00000000 00000001 00000001 C838AE89
GPR08: 0FF5145C 00000000 01FCA055 03F940AB 0FE8FB50 041F0000 0FFACD00 0EED0000
GPR16: 00000000 00000000 00000000 00000000 0FE8FDA0 00000040 0FE8FDA0 0FE8FDA0
GPR24: 00000000 00000100 00000010 00000004 FFFFF000 0FE8FF40 0FFADB58 0FE8FDA0
Call backtrace:
machine check
}}}

I get the same error if I press "ENTER" after u-boot gives me the
prompt. If I type some command its ok and then its fine thereafter.

I know the NOR flash is ok because I used BDI to program it and also I
can access this address when I boot from NOR flash.

Any Clue?

Thanks In Advance!

Nikhil Gautam