i meet the same problem,though i 'm using linux-2.40-test10-rmk2-np3.
i tried to mout loopback device on flash and nfs file system,but the system
just hang.
i did some printk work to find what's going wrong,and found in fuction
"do_lo_request" (loop.c),
system doing infinite loop.

Guillaume Jaunet wrote:

> I've got an an assabet platform with a Microdrive. I'm starting Linux
> from flash with a Ramdisk. I'd like to be able to modify this ramdisk
> directly from the embedded platform. So I tried to mount the
> corresponding file with the following command :
>
> mount -o loop -t ext2 ramdisk_ks /mnt/ramdisk
>
> But this command fails. I get no output messages and loose control over
> the box. But the scheduler is still running, as a flashing led indicates
> me.
> I thought about memory lack (the kernel would do calls to free some) but
> I've still got 12Mb of available memory to mount a 8Mb ramdisk.
>
> I've compiled kernel with loopback support, the ramdisk_ks file is the
> decompressed image of my ramdisk and the mount point exists.
>
> I,ve debugged the mount program with gdb, and it seems that the problem
> is in the kernel : I can get to the mount system call, and then it
> "hangs".
>

[linuxkernelnewbies] The Ipaq Archives: [iPAQ] Re: mounting Ramdisk with loopback

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