[EMAIL PROTECTED] wrote:
On Tuesday 30 August 2005 11:23, [EMAIL PROTECTED]
wrote:
HCK,
just use the initrd for your ramdisk. Rather than doing a NFS mount,
and a pivot-root, just put all the stuff you need into your initrd, and
at the end of /linuxrc, run /sbin/init.
If you are using a 2.6 kernel, take a look at initramfs, rather than
initrd. It's a bit more flexible.
Jim McQuillan
[EMAIL PROTECTED]
On Sat, 27 Aug 2005, hckimm2 wrote:
Hi
I am an engineer who is making communication systems.
I have a board(made by Kontron ltd, Intel CPU, currently with diskless )
that is used in compactPCI.
I boot that board with network PXELINUX method and currently using NFS.
But I don't want to use NFS and I want to make and use ram disk image.
That means I want to use a ram disk as / after network booting.
Currently I made a initrd by ltsp_initrd_kit.
What should I have to change in 'linuxrc' file and pxelinux.cfg/default
file. And how can I make ram disk image.
I'd love to hear pros/cons of using the initrd for ever, vs using the initrd
to unwind a root fs into ram, then pivot root to ram. I've done both.
The only caveat I've got: if you unwind a usb-mem stick (even a fast stick)
it's s--o-- s--l--o--w-- (100s K/sec no Ms/sec!!)
initrd purpose is to load an initial filesystem in ramdisk memory. What
programs are called in that initrd is up to you (edit your linuxrc file
accordingly).
The only potential drawback I could see to using a initrd only root FS
is the initrd file could get so large that it would not all fit into
memory. To correct, it would require a special kernel built to make
initrd image as large as you need. Not an impossible problem to work
around.
The memory stick is slow because of the technology (slow writes,
slightly improved reads). Memory sticks are meant for a convenient
replacement for floppies. I have a boot version of Linux working with a
USB memory stick. It does work, but, I agree is slow. However, it
makes it very convenient to load a complete Linux OS (with GUI) on a
memory stick, go to a Windows computer that supports booting from USB
device, and boot into Linux without touching the Windows drive.
Ken Cobler
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