Re: [Qemu-devel] PreP kernels boot using Qemu

[Rob Landley <rob@landley.net>]

On Sunday 28 October 2007 4:29:15 am Aurelien Jarno wrote:
> Rob Landley a écrit :
> > On Saturday 27 October 2007 3:07:05 am Aurelien Jarno wrote:
> >> Rob Landley a écrit :
> >>> On Monday 22 October 2007 11:28:10 am Aurelien Jarno wrote:
> >>>> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
> >>>>
> >>>> diff --git a/arch/ppc/syslib/i8259.c b/arch/ppc/syslib/i8259.c
> >>>> index 1e5a00a..559f27c 100644
> >>>> --- a/arch/ppc/syslib/i8259.c
> >>>> +++ b/arch/ppc/syslib/i8259.c
> >>>> @@ -127,6 +127,7 @@ static void i8259_unmask_irq(unsigned int irq_nr)
> >>>>  static struct irq_chip i8259_pic = {
> >>>>  	.typename	= " i8259    ",
> >>>>  	.mask		= i8259_mask_irq,
> >>>> +	.disable	= i8259_mask_irq,
> >>>>  	.unmask		= i8259_unmask_irq,
> >>>>  	.mask_ack	= i8259_mask_and_ack_irq,
> >>>>  };
> >>>
> >>> Using mdm's qemu target platform and the 4k bios that supplies a device
> >>> tree, I applied this but it didn't make any difference in the ne2k-pci
> >>> adapter (not that I noticed).  It still doesn't bind to anything during
> >>> bootup.  (There's no eth0.)
> >>
> >> You need this patch to get the *ISA* NE2000 card working, the PCI one
> >> still doesn't work.
> >
> > Hmmm, Milton's ppc_qemu patch forgot to add PPC_QEMU to the ISA
> > dependency list along with PREP and CHRP.  Let's see, patch that, switch
> > on the config
> >
> > symbol, build in that driver and...  Nope:
> >> ne.c:v1.10 9/23/94 Donald Becker (becker@scyld.com)
> >> Last modified Nov 1, 2000 by Paul Gortmaker
> >> NE*000 ethercard probe at 0x300: failed to detect IRQ line.
> >
> > I still have no eth0.
>
> You have to build the NE2000 driver as a module, and pass irq=9 io=0x300
> when loading it.

Hmmm...  All the kernels I've built for this project are static.  In theory I 
can add "ne.irq=9" to the kernel command line, but in practice it doesn't 
seem to work.  Nor does ne.0.irq=9 or irq=9

However, when I hardwire "dev->irq=9;" into the source code, it does seem to 
work.  (Or at least I can ping qemu's virtual gateway.)

Off to read the kernel command line parsing logic...

Thanks,

Rob
-- 
"One of my most productive days was throwing away 1000 lines of code."
  - Ken Thompson.