[XenPPC] Booting Dom0 with SLES10 on JS20

[Tony Breeds <tony@xxxxxxxxxxxxxxxxxx>]

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.

 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!


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