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Re: [Qemu-devel] Powerpc regressions?

From: Rob Landley
Subject: Re: [Qemu-devel] Powerpc regressions?
Date: Sun, 2 Aug 2009 00:40:53 -0500
User-agent: KMail/1.11.2 (Linux/2.6.28-13-generic; KDE/4.2.2; x86_64; ; )

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.

Any idea what I'm doing wrong?


Latency is more important than throughput. It's that simple. - Linus Torvalds

Attachment: .config.zip
Description: Zip archive

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