what files should be included in initrd

what files should be included in initrd

[Walser Martin]

Hi,

sorry for this question, but it's the first time I try to use linux on my
custom board.
I'm using PPCBoot and the MontaVista kernel. Both work fine, but I don't
know how to make a initrd image.

Can someone give me a short overwiew on how to build such an image and what
files should be included?

thanks
Martin


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Re: what files should be included in initrd

[Wolfgang Denk]

In message <040944A92C91D211954D00C095EE82680168FF32@POST> you wrote:
>
> sorry for this question, but it's the first time I try to use linux on my

It's a good question, but it has been asked many, many times before.
See http://penguinppc.org/usr/embedded/howto/PowerPC-Embedded-HOWTO-13.html#ss13.2
and http://www.linux.org/docs/ldp/howto/Bootdisk-HOWTO/buildroot.html

> I'm using PPCBoot and the MontaVista kernel. Both work fine, but I don't
> know how to make a initrd image.

See "Documentation/initrd.txt" in your Linux source directory.

> Can someone give me a short overwiew on how to build such an image and what
> files should be included?

You include those files you need in your embedded system. The minimum
(without any tricks and modifications  to  the  Linux  kernel)  is  a
special  file  for  /dev/console (c 5 1) and a regular file with your
statically linked application that is started as init process.

See ftp://ftp.denx.de/pub/LinuxPPC/usr/src/SIMPLE-PPCBOOT-ramdisk for
an example - this is a PPCBoot image ready for use; you can use

	dd if=SIMPLE-PPCBOOT-ramdisk bs=64 skip=1 of=ramdisk.image.gz

to create a "normal" ramdisk image.


Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
"There are three principal ways to lose money: wine, women, and engi-
neers. While the first two are more pleasant, the third is by far the
more certain."                           - Baron Rothschild, ca. 1800

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Re: what files should be included in initrd

[Mark Phillips]

Walser,

In my opinion, the best source for this is the Bootdisk-Howto, available everywhere (for example http://www.linuxdoc.org/HOWTO/Bootdisk-HOWTO/)
You should skip the "ldconfig" step.
You should also refer to Initrd.txt in the Documentation subdirectory of your kernel.

Mark Phillips

Walser Martin <walser.martin@rw.hirschmann.at> wrote:
>
>
> Hi,
>
> sorry for this question, but it's the first time I try to use linux on my
> custom board.
> I'm using PPCBoot and the MontaVista kernel. Both work fine, but I don't
> know how to make a initrd image.
>
> Can someone give me a short overwiew on how to build such an image and what
> files should be included?
>
> thanks
> Martin
>
>
>
>

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