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Re: [Qemu-devel] Powerpc regressions?

From: Alexander Graf
Subject: Re: [Qemu-devel] Powerpc regressions?
Date: Sun, 2 Aug 2009 14:25:45 +0200

On 02.08.2009, at 12:04, Aurelien Jarno wrote:

On Sun, Aug 02, 2009 at 12:40:53AM -0500, Rob Landley wrote:
On Monday 13 July 2009 07:25:45 Aurelien Jarno wrote:
If changing my kernel .config so I build a new kernel that works with the
new qemu is my only alternative, I'm happy to do that.  But I don't
currently have a working kernel .config, and don't understand why the old
one broke or how to avoid being hit by similar changes in future.

I am using the Debian kernel and it works fine, please find attached the
.config attached.

Finally got back in a position to spend some more time on this. Sorry for the

Ok, I'm trying just to boot to a command prompt with a serial console and IDE
/dev/hda.  (Or funky scsi IDE /dev/sda in a pinch.)

Your .config is for a 2.6.26 kernel and I'm building 2.6.30, so I have to run make oldconfig against it (and just hit enter on everything to take the defaults). Also, I'm not using an initramfs at the moment, so presumably anything that's in a module can go because it won't get loaded before I get a
shell prompt anyway, so I can yank anything config =m, and the module
infrastructure itself, to simplify things a bit.

That gave me the (much smaller) attached .config, which _should_ work the same as yours, I hope? Note that CONFIG_SERIAL_8250_CONSOLE is on, so I should be able to get a serial console, which is my first target: get boot messages from
this kernel.

I built a kernel using the attached .config and my existing powerpc toolchain (which built a kernel that booted under older qemu), and attempted to boot the
result under current git (28e738dcb81d):

qemu-system-ppc -M g3beige -nographic -no-reboot -kernel zImage- powerpc -hda image-powerpc.sqf -append "root=/dev/hda rw init=/usr/sbin/ init.sh
panic=1 PATH=/usr/bin console=ttyS0 "

OpenBIOS 1.0 [Jul 5 2009 17:36]
Configuration device id QEMU version 1 machine id 2
CPUs: 1
Memory: 128M
UUID: 00000000-0000-0000-0000-000000000000
CPU type PowerPC,750
Welcome to OpenBIOS v1.0 built on Jul 5 2009 17:36

[ppc] Kernel already loaded (0x01000000 + 0x0039bef0) (initrd 0x00000000 +
[ppc] Kernel command line: root=/dev/hda rw init=/usr/sbin/ init.sh panic=1
PATH=/usr/bin console=ttyS0
OF stdout device is: 
Preparing to boot Linux version 2.6.30 (address@hidden) (gcc version 4.2.1)
#1 Sat Aug 1 17:35:12 CDT 2009
command line: root=/dev/hda rw init=/usr/sbin/init.sh panic=1 PATH=/ usr/bin
memory layout at init:
 alloc_bottom : 013a0000
 alloc_top    : 08000000
 alloc_top_hi : 08000000
 rmo_top      : 08000000
 ram_top      : 08000000
found display   : /address@hidden/QEMU,address@hidden, opening... done
copying OF device tree...
Building dt strings...
Building dt structure...
Device tree strings 0x013a1000 -> 0x013a1383
Device tree struct  0x013a2000 -> 0x013a4000
Calling quiesce...
returning from prom_init

At which point it exits and I get the prompt back.

I think using console=ttyPZ0 which is the serial port name on PowerPC
will give you more details.

Also try "-vnc :5 -serial mon:stdio" instead of -nographic.


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