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xen-ppc-devel
Re: [XenPPC] Booting Dom0 with SLES10 on JS20
Tony Breeds wrote:
Hi All,
I thought I'd jot down a few notes about getting Xen and dom0 up and
running on a JS20 blade.
This assumes that you have a working OS on the blade. I used SLES10-rc3
but debian of other distribution with a kernel 2.6.10+ should be fine.
I have sent you a note about how you got SLES10-rc3 on the machine.
Probably not all people want to know the details, but I was unable to
boot the install kernel with SLOF. (This is a weird version of SLOF)
1) Install SLOF as per the instructions at:
http://www-128.ibm.com/developerworks/power/pa-slof/
After installing SLOF the machine will auto-netboot. I found that SLOF
is rather picky about what it will and will not boot. In fact the /only/
success I had was net-booting Xen as built in the next step.
If you have need to switch back to the non-SLOF firmware:
* When to see "SLOF" appears in the SOL console press any key to be dropped
into a Firmware prompt
* O > other-firmware
will reset the blade and make it boot with the firmware in the "P" side
The only way I found to get back to SLOF was to pull the blade.
2) Build Xen and dom0.
I did this on separate PPC machine but can be done on the JS20 before you
install SLOF. (or from a boot the JS20 native firmware)
These are the checkouts from the various mercurial trees I used:
tony@Fandango2:~/Xen/linux-ppc-2.6.hg.working$ hg ident
72c8bc5d88f4+ tip
tony@Fandango2:~/Xen/xenppc-unstable.hg.working/xen$ hg ident
b11a2c7b2989+ tip
The .config I crafted for the dom0 image is attached. It's based on the
xen_maple_defconfig in the linux-ppc-2.6.hg repo.
* To build linux I did:
cd path/to/linux-ppc-2.6.hg.working
cp ~/JS20.config .config
apply the Makefile_fix.patch (below)
# There are better ways but I wanted a quick fix.
make silentoldconfig
make zImage
* Now build Xen
cd path/to/xenppc-unstable.hg.working/xen
apply the default_bootargs.patch (below)
# Again there are better ways but I wanted a quick fix.
make debug=y optimize=0 \
DOM0_IMAGE=path/to/linux-ppc-2.6.hg.working/arch/powerpc/boot/zImage
move/copy the "xen" binary to the tftp server with the appropriate name
3) Reboot and enjoy Xen/Dom0 goodness
Clearly this process doesn't build the tools, or kernel modules but they're
not needed at this point.
If people care to see a boot log or other information I can post it
here.
This setup, auto-netbooting with no way to pass args to xen or dom0
(other than to compiler them in) seems cumbersome are there better
options?
----------------
Ref: makefile_fix.patch
arch/powerpc/platforms/xen deosn't seem to contain a xen_guest.[csS] file
so don't try and build a .o. The xen_guest section will come from
arch/powerpc/boot/xen_guest.S anyway.
diff -r 72c8bc5d88f4 arch/powerpc/platforms/xen/Makefile
--- a/arch/powerpc/platforms/xen/Makefile Thu Jun 29 13:04:30 2006 -0400
+++ b/arch/powerpc/platforms/xen/Makefile Mon Jul 17 15:14:39 2006 +1000
@@ -1,4 +1,4 @@ obj-y += setup.o evtchn.o hcall.o udbg_x
-obj-y += setup.o evtchn.o hcall.o udbg_xen.o xen_guest.o
+obj-y += setup.o evtchn.o hcall.o udbg_xen.o
ifndef CONFIG_XEN_BALLOON
obj-y += balloon.o
----------------
----------------
Ref: default_bootargs.patch
As the dom0 image is built into xen, I need to tell dom0 where it's root fs.
diff -r b11a2c7b2989 xen/arch/powerpc/ofd_fixup.c
--- a/xen/arch/powerpc/ofd_fixup.c Fri Jul 07 13:57:26 2006 -0500
+++ b/xen/arch/powerpc/ofd_fixup.c Mon Jul 17 15:13:35 2006 +1000
@@ -247,7 +247,7 @@ static ofdn_t ofd_xics_props(void *m)
* Good things you can stick here:
* init=/bin/bash ip=dhcp root=/dev/hda2 ide=nodma
*/
-static char default_bootargs[] = "";
+static char default_bootargs[] = "root=/dev/hda3 ro";
static ofdn_t ofd_chosen_props(void *m, const char *cmdline)
{
----------------
Yours Tony
linux.conf.au http://linux.conf.au/ || http://lca2007.linux.org.au/
Jan 15-20 2007 The Australian Linux Technical Conference!
_______________________________________________
Xen-ppc-devel mailing list
Xen-ppc-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-ppc-devel
I should also add that on a JS21 where we managed to install SLES10-rc3,
essentially the same set up as Tony, Dan Poff and I were unable to start
Dom0. In all likelyhood we ran out of memory.
Dan is currently working on fixing the memory situation.
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