help needed to boot from compact flash

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Date: Mon, 24 Jan 2005 05:32:55 GMT

Hi All,

I have trying to move my linux from harddrive to a compact flash without
much success for a week. Here is what I am trying to do:

I already have my own kernel and modules, tested successfully on my computer
on hard drive. I followed
the three article series from Bruce Perens here to make busybox and file
system:

part 1 for busybox
http://www.linuxdevices.com/articles/AT6143283999.html

part 2 for file system,
http://linuxdevices.com/articles/AT9416075241.html
I used Ram disk intead of romfs described in book by Karim Yaghmour
"Building embedded Linux systems"

The compact flash is connect to an IDE to CF, set to the master of the
second channel.

Then I used grub to load my kernel and initrd. by running /sbin/grub
root (hd2,0)
setup (hd2,0)

When it boots, it gives me a grub prompt
I typed

kernel /boot/bzImage
initrd /boot/initrd.bin
boot

where the initrd.bin is a compressed Ram disk image from the whole rootfs.

Then I got this message
....
VFS: Mounted root (ext2 filesystems).
kmod: failed to exec /sbin/modeprobe -s -k block-major-3 errrno=2
VFS: Cann't open root device "" or 03:07
Please append a correct "root=" boot option
kernel panic: VFS: Unable to mount root fs on 03:07

I also tried to copy the filesystem directly to the flash and reboot
it also gives me a grub prompt
do the same for the kernel and initrd (I used the real initrd.img from
mkinitrd this time)
I got this message:
hda hda1 hda1 hda3 (these are OK because I have three partitions on the
compact flash)
hda7 bad access block 3 count 2
end-request I/O error dev 03:07 (hda) sector 2
unable to read superblock
...
I never have anything like hda7. It has only 3 partitions.

Can any one help me here? Do I have to compile all the modules into the
kernel or keep them as modules as I am doing it now?

Thanks in advance.

Everett

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