error code as follow:
ACPIsupports s0 s1 s4 s5)
RAMDISK:cramfs filesystem found at block 0
RAMDISK:Loading 4256 blocks [1 disk] into ram disk ....done.
VFS:Mounted root (cramfs filesystem) readonly
Error -3 while decompressing!
c033dc10 (1816815467)->F7AD8000(4096)
Error -3 while decompressing!
c033dc10 (1816815467)->F7AD8000(4096)

request_modules:runaway loop modproble binfmt-0000
request_modules:runaway loop modproble binfmt-0000
request_modules:runaway loop modproble binfmt-0000
request_modules:runaway loop modproble binfmt-0000
request_modules:runaway loop modproble binfmt-0000

what's does the code mean??and how to solve ,thanks.....................

There isn't a great deal of info on this but I would suspect that the initrd.img may be corrupt. You have not provided a lot of history. Have you just upgraded the kernel? Was the previous kernel booting correctly? Could you give some background to this.

the debian was installed in one harddisk,and other OS was installed in the first harddisk,so there are not in the same harddisk!
when i boot debian from its master hd,it works well,everything was ok!
but when it was the slave hd,and boot from another GRUB,it doesn't works,just like above error.so I don't know where the problem is.....

Maybe reinstalling Debian again from scratch paying special attention on the drive partitions specially would solve the problem. Hope you fix/have fixed it.

Regards