[U-Boot] Board Reset issue

[rk1825]

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 ? 
-- 
View this message in context: http://www.nabble.com/Board-Reset-issue-tp22802830p22802830.html
Sent from the Uboot - Users mailing list archive at Nabble.com.