xen,bproc and grub

Adam Sulmicki adam at cfar.umd.edu
Sun Nov 7 13:05:00 CET 2004

> Thus I'm trying to figure out how I could boot xen/linux- duo
> on nodes. Are there any other options to boot it besides using grub[4][5]?
> and preferably does not rquire multiboot [6].
> I figure out I that maybe could load xen.gz [7] using FILO, Kexec, or
> maybe etherboot but it still would not load linux kernel in turn (because
> of the dependency on multiboot).

ok, so I I grabbed kexec-tools-1.98, then I patched it with this patch


and I got an kexec kernel that supports multiboot. Now the fun thing is
that on laptop it just works fine, as it should, but on an another machine
the same setup results in reboot instead of starting a new kernel. weird

ideas ?

monte: entry point (protected mode): 0x100000
Linux version (root at redbull) (gcc version 3.3.3 (SuSE Linux)) #6 Sat Nov 6 14:58:34 MST 2004
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 0000000000000b40 (reserved)
 BIOS-e820: 0000000000000b40 - 00000000000a0000 (usable)
 BIOS-e820: 0000000000100000 - 0000000010000000 (usable)
256MB LOWMEM available.
DMI not present.
ACPI: Unable to locate RSDP
Built 1 zonelists
Kernel command line: console=ttyS0,19200 root=/dev/nfs nfsroot= ip= init=/bin/sh
Initializing CPU#0
PID hash table entries: 2048 (order 11: 16384 bytes)
Detected 533.502 MHz processor.
Using tsc for high-res timesource
Console: colour dummy device 80x25
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Memory: 255300k/262144k available (1108k kernel code, 6100k reserved, 371k data, 100k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay loop... 1048.57 BogoMIPS
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
CPU: L1 I Cache: 64K (32 bytes/line), D cache 64K (32 bytes/line)
CPU: L2 Cache: 64K (32 bytes/line)
CPU: Centaur VIA Samuel 2 stepping 03
Checking 'hlt' instruction... OK.
Checking for popad bug... OK.
checking if image is initramfs... it is
Freeing initrd memory: 1588k freed
NET: Registered protocol family 16
PCI: Using configuration type 1
Linux Plug and Play Support v0.97 (c) Adam Belay
PCI: Probing PCI hardware
PCI: Probing PCI hardware (bus 00)
PCI: Using IRQ router VIA [1106/8231] at 0000:00:11.0
isapnp: Scanning for PnP cards...
isapnp: No Plug & Play device found
Serial: 8250/16550 driver $Revision: 1.90 $ 8 ports, IRQ sharing disabled
ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
via-rhine.c:v1.10-LK1.1.20-2.6 May-23-2004 Written by Donald Becker
PCI: Found IRQ 11 for device 0000:00:12.0
IRQ routing conflict for 0000:00:11.2, have irq 12, want irq 11
IRQ routing conflict for 0000:00:11.3, have irq 12, want irq 11
eth0: VIA Rhine II at 0x1800, 00:40:63:cc:0e:d9, IRQ 11.
eth0: MII PHY found at address 1, status 0x786d advertising 05e1 Link 45e1.
mice: PS/2 mouse device common for all mice
i8042.c: Can't read CTR while initializing i8042.
NET: Registered protocol family 2
IP: routing cache hash table of 2048 buckets, 16Kbytes
TCP: Hash tables configured (established 16384 bind 32768)
NET: Registered protocol family 17
eth0: Setting full-duplex based on MII #1 link partner capability of 45e1.
IP-Config: Complete:
      device=eth0, addr=, mask=, gw=,
     host=node2, domain=, nis-domain=(none),
     bootserver=, rootserver=, rootpath=
Looking up port of RPC 100003/2 on
Looking up port of RPC 100005/1 on
VFS: Mounted root (nfs filesystem) readonly.
Freeing unused kernel memory: 100k freed


sh-2.05b# /sbin/kexec

No kernel specified
kexec 1.98 released 15 September 2004
Usage: kexec [OPTION]... [kernel]
Directly reboot into a new kernel

 -h, --help        Print this help.
 -v, --version     Print the version of kexec.
 -f, --force       Force an immediate kexec, don't call shutdown.
 -x, --no-ifdown   Don't bring down network interfaces.
                   (if used, must be last option specified)
 -l, --load        Load the new kernel into the current kernel.
 -u, --unload      Unload the current kexec target kernel.
 -e, --exec        Execute a currently loaded kernel.
 -t, --type=TYPE   Specify the new kernel is of this type.

Supported kernel file types and options:
    --command-line=STRING        Set the kernel command line to STRING.
    --module="MOD arg1 arg2..."  Load module MOD with command-line "arg1..."
                                 (can be used multiple times).
    --reset-vga                  Include code to set VGA text mode 3.
                                 (use this flag at load time).
    --command-line=STRING Set the kernel command line to STRING
    --append=STRING       Set the kernel command line to STRING
    --initrd=FILE         Use FILE as the kernel's initial ramdisk.
    --ramdisk=FILE        Use FILE as the kernel's initial ramdisk.
    --args-linux          Pass linux kernel style options
    --args-elf            Pass elf boot notes
-d, --debug               Enable debugging to help spot a failure.
    --real-mode           Use the kernels real mode entry point.
    --command-line=STRING Set the kernel command line to STRING.
    --append=STRING       Set the kernel command line to STRING.
    --initrd=FILE         Use FILE as the kernel's initial ramdisk.
    --ramdisk=FILE        Use FILE as the kernel's initial ramdisk.

sh-2.05b# /sbin/kexec --load /boot/xen-full --type=multiboot-x86 \
>                 --command-line="dom0_mem=65536" \
>                 --module="/boot/vmlinuz-
Cannot open /proc/iomem: No such file or directory
Could not get memory layout


sh-2.05b# mount /proc


sh-2.05b# cat /proc/iomem

00000000-00000b3f : reserved
00000b40-0009ffff : System RAM
000a0000-000bffff : Video RAM area
000f0000-000fffff : System ROM
00100000-0fffffff : System RAM
  00100000-00215068 : Kernel code
  00215069-00271e9f : Kernel data
feb00000-feb000ff : 0000:00:12.0
  feb00000-feb000ff : via-rhine


sh-2.05b# cat /proc/mounts

rootfs / rootfs rw 0 0
/dev/root / nfs ro,v2,rsize=4096,wsize=4096,hard,udp,nolock,addr= 0 0 proc /proc proc rw,nodiratime 0 0

sh-2.05b# touch /x

touch: cannot touch `/x': Read-only file system

sh-2.05b# /sbin/kexec --load /boot/xen-full --type=multiboot-x86 \
>                 --command-line="dom0_mem=65536" \
>                 --module="/boot/vmlinuz- root=/dev/hda1"
kexec_load succeeded (multiboot-x86)

sh-2.05b# /sbin/kexec -e

Starting new kernel

LinuxBIOS- Wed Mar 24 14:39:17 MST 2004 starting...
vt8601 init starting
Slot 00 is SDRAM 10000000 bytes
Slot 01smbus_error: 04
Device Error
 is empty
Slot 02smbus_error: 04
Device Error
 is empty
Slot 03smbus_error: 04
Device Error
 is empty
vt8601 done
LinuxBIOS- Wed Mar 24 14:39:17 MST 2004 booting...

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