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. Cheers