[U-Boot-Users] Booting kernel with initrd

[Wolfgang Denk]

Dear Rainer,

in message <2574043332486841A5B27A5FE9769E45014F82C2 at esealnt888.al.sw.ericsson.se> you wrote:

> I want to have it like the configuration with loadlin, where you have the four files on the FAT filesystem, the kernel, the initrd image, the root filesystem image (ext2) and a swap image. When the kernel boots the initrd, this mounts the root filesyste
> m through the loopback device (root=/dev/loop0), this is described various times on the net.

Can you please restrict your line  length  to  the  usual  70  or  so
characters? Thanks.

> I have read the manuals about uboot i have found (DLUG).
> 
> The bootm command describes how the images (kernel and initrd) are processed, when they are in flash and copied out in memeory. But that not what i need in this case. They must be loaded from filesystem into RAM. It makes no sense to load the images int

Just use "fatload" to load the images to RAM, then.

> o RAM with another command and then run bootm, which copies them from one position in RAM to another.

But this is the way it needs to be done. There is a command  to  load
it  to  memory  (fatload  in  your  case),  and  another  command  to
uncompress the kernel and start it (bootm).

> The reply from fumin showed a way to do this. Looking at the kernel source for the parameter parsing for initrd parameter assumes initrd=0x00800000,16M to be correct (first start address and then size). I dont understood 
> your reply.

I don;t understand your question and/or problem.

> Maybe i have completly misunderstood something, but for me the boot sequency is to load the kernel from filesystem (probable fatload, but where is the documentation for that command), then the initrd, and then starting the kernel with go with bootargs s
> et to root=/dev/loop0 initrd=start,size.

Did you ever try typing "help fatload" at the U-Boot prompt?

Ther eyou got your documentation. If this is not sufficient for  you,
then please RTFS.

> Is this wrong ?

Yes, this is worng. A kernel does NOT get started by "go",  but  only
by "bootm".

> Should i use other commands ?

Yes, see above.


Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
Don't panic.