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a question qbout kernel panic

when i port the 2.6 kernel to a mips machine, a kernel panic happens in
prepare_namespace function when try to mount_root:
VFS: Cannot open root device hda1 or unknown-block(0,0)
Please append a correct "root=" boot option

kernel panic: VFS: Unable to mount root fs on unknown-block(0,0)

when i debug into the kernel, i find the return value of ext3_get_sb()
is wrong, and it is because the do_open failed, can some one help me to
find the

thank you!
zouqiong <zouqiong@ict.ac.cn>

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