autoboot with initial RAM disk

Wolfgang Denk wd at
Fri Dec 21 19:49:30 EST 2001

In message <B164B53F5BD6D511888D009027732E1A0249CB at ntserver.act.domain> you wrote:
> I am using ppcboot to start my 8260 based card. At the moment, we load Linux
> kernel via tftp and then start it. Linux kernel maps its root file system
> over the network. This works fine qith ppcboot autoboot feature.
> Now, we want to put initial RAM disk into RAM as well as compressed kernel.
> Do do that, both images have to be copied into card's memory using tftp and
> them bootm command will be used with two arguments to start kernel.
> To continue to use ppcboot autoboot feature we have to pass two commands as
> boot command (to tftp two kernels) and then issue bootm command with two
> arguments. Is there any way of doing it without altering the ppcboot source
> code?

There are many ways.

First, you can define a complex boot sequence  in  one  command,  for
instance like this:

=> setenv bootcmd tftp 100000 /tftpboot/pImage\;tftp 200000 /tftpboot/pRamdisk\;bootm 100000 200000

You can also get the IP configuration in the first step for instance using DHCP and then re-use this:

=> setenv bootcmd dhcpboot 100000\;tftp 200000 /tftpboot/pRamdisk\;bootm 100000 200000


But the most simple way is to combine the kernel and  ramdisk  images
into one PPCBoot image (using the "multi-file image" format) and just
use this:

=> setenv bootcmd tftp 100000 /tftpboot/pMulti\;bootm 100000

See the SELF Makefile for example how to build multifile images.  You
can find our Simple Embedded Linux Framework at

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at
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