RAMDISK (initrd) booting in 2.3.13

Richard B. Johnson (root@chaos.analogic.com)
Thu, 26 Aug 1999 13:44:40 -0400 (EDT)


Hello,

I am making an embedded kernel, booted from NVRAM. Initial tests fail
so I am emulating it with a floppy. In the emulation, I simply boot using
initrd using a compressed root image located on the floppy. This works
fine and executes /linuxrc okay.

According to the documentation in ../linux/Documentation/initrd.txt,
line 206, in order to stay on the ramdisk mounted root file-system, I
should specify the new root to be the RAM disk.

This doesn't work. /dev/ram (on the boot image ramdisk) is a symlink to
/dev/ram1, a block-special device, major 1, minor 1.
When the machine boots, the resulting panic is:

Unable to mount root fs on 01:01.

This shows that lilo has properly interpreted what I told it, but that
/dev/ram1 isn't what is currently mounted as the initial RAM disk.
/dev/ram1 probably contains the compressed ramdisk image, not the
uncompressed file-system.

The question is; What is the name of the current root file-system when
a ramdisk is mounted? The documentation is probably not too up to date.
I guessed that it was /initrd, but that didn't work either.

Cheers,
Dick Johnson
**** FILE SYSTEM WAS MODIFIED ****
Penguin : Linux version 2.3.13 on an i686 machine (400.59 BogoMips).
Warning : It's hard to remain at the trailing edge of technology.

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