[U-Boot] Board Reset issue

[Liu Dave-R63238]

> I am using a custom board with MPC8313E processor. In u-boot 
> prompt, when i
> do TFTP of large size files, sometime it hangs completely 
> and, sometimes it
> says bus fault,  prints following message and resets the board.
> 
> /////////////////////////////////////////////////message
> printed/////////////////////////////////////////////////
> Bus Fault @ 0x00000900, fixup 0x00000000
> Machine check in kernel mode.
> Caused by (from msr): regs 07f85b48 Unknown values in msr
> NIP: 00000900 XER: 20000000 LR: 07FC709C REGS: 07f85b48 TRAP: 
> 0200 DAR:
> 07F85F58
> MSR: 00001000 EE: 0 PR: 0 FP: 0 ME: 1 IR/DR: 00
> 
> GPR00: 00000000 07F85C38 00000080 FFFFFFFF 07FFCD80 07FEDB88 07FEDB88
> 07FED124
> GPR08: 07FEDB98 4E800020 07FEDBB0 0000000C 07F85B28 F54ADC0C 07FF0000
> 09FA8000
> GPR16: 7347FB13 00000000 00000000 00000000 00000000 00000000 00000000
> 00000000
> GPR24: 07F89ED8 00000000 07F85FBC 00000003 00000000 07F85F58 0FFF1390
> 07FED054
> Call backtrace:
> 07FC70D4 07FC7274 07FC73F8 07FAE0E8 07FC4724 07FCBDDC 07FCB4D0
> 07FCB6DC 07FBAAC4 07FCBDDC 07FCB4D0 07FCB62C 07FBA2B4 07FAC84C
> 07FAB66C 00420400
> machine check
> Resetting the board.
> //////////////////////////////////////////////////////////////
> /////////////////////////////////////////////////
> 
> Please help me with what could be the reason for this ? 

Did you have one stable memory system?

What is the clock information? Such as core/csb/ddr data rate?
What is the ACR value?

Thanks, Dave