help : choose "/dev/nvram support" can destroy the date in NVRAM?

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I have downloaded linux2.4.4-2002-10-06 from www.denix.de
My target board is MBX860 .
I config linux with MTD and JFFS2,
boot linux on MBX860,but MTD fail to load,
then power off MBX860 board ,then power on MBX860
board, the EPPC_BUG program on MBX860's ROM cannot
boot !!!!.
I take out board J1 jumper (backup battery),then put in
J1 jumper , the EPPC_BUG can boot.

why EPPC_BUG could not boot ?
choose "make menuconfig" ->"Character devices" ->"/dev/nvram support" can
cause EPPC_BUG cannot boot??
( the EPPC_BUG program may read  paramters in NVRAM )

choose "/dev/nvram support" can destroy the date in NVRAM?

please help me !
thanks !

 ------------------------------
 guo zhenglin
 ------------------------------
 OKI Software Technology Co.,Ltd.
 Development Division
 E-mail: guo_zl9@hotmail.com
 TEL:+86-519-690-2222(ext.249)
 FAX:+86-519-690-2188
 ------------------------------
 http://www.okijs.com/
 ------------------------------

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