On Thu, Jun 30, 2011 at 06:30:04PM +0530, Suzuki Poulose wrote:
On 06/30/11 18:02, Edgar E. Iglesias wrote:
On Thu, Jun 30, 2011 at 05:45:23PM +0530, Suzuki Poulose wrote:
Hi,
I am working on enabling the KEXEC on PPC440 chipsets. To debug my patches,
I would like to use the Qemu. The only available PPC440 support in Qemu is
for the ppc-virtex. (Thanks for adding the support).
I was trying to use the default image provided at
http://wiki.qemu.org/download/ppc-virtexml507-linux-2_6_34.tgz
However I cannot get the network up for the board to use the nfs root file
system.
Hi,
The problem is that there is no model of the LL-TEMAC in qemu, the one in
the refdesign beeing emulated. An easy way out is probably to connect
a xilinx,ethlite instead. You'll need to modify both QEMU and the dtb.
IIRC, the dtb published with the image has the lltemac removed.
I've got a working LL-temac model here, will try to post it this weekend.
Or if you're interested in hacking on it, I could probably code dump it as
is.
Edgar,
Thanks a lot for the quick reply.
Is there something I can do to get the networking up ? I think this may need to
be fixed in the dtb.
Or is there any other mechanism to use a different file system ?
( I have the tool chain to build the kernel etc)
Another way is to create ramdisks with all the stuff you need and just
not use networking. Thats how the image from the wiki does it.
I think I can try this option. By the way, could you pass on the steps to
attach the ramdisks to the image ?
Hi,
If I dont remember wrong, the image on the wiki contains a kernelconfig file.
The config file sets the CONFIG_INITRAMFS_SOURCE option to "./romfs".
In my case I created a romfs subdir right in my linux-2.6 kernel tree,
e.g linux-2.6/romfs/.
You'll then have to populate the romfs directory with all the things
you need. romfs/dev/xxx, romfs/lib/xxx etc etc.
Then, once you build the kernel, an image of the romfs/ will be baked
into the kernel image. You then need to choose your init cmd by
passing an rdinit option in ther kernel cmd line.
With qemu:
-append "rdinit=/bin/sh"
The qemu-run.sh script from the wiki does that aswell.
There are probably other better ways to do it that I am not aware
of at the moment. But I hope it helps as example.