Re: [Qemu-devel] Powerpc regressions?

[Aurelien Jarno]

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 
> delay.
> 
> 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 + 
> 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: 
> /address@hidden/address@hidden/address@hidden/address@hidden
> 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 
> console=ttyS0 
> 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.

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
address@hidden                 http://www.aurel32.net