Re: [Qemu-devel] [PATCH, RFC 3/4] prep: Fix duplicate ISA IDE IRQ

[Aurelien Jarno]

On Tue, Dec 14, 2010 at 01:49:17AM +0100, Andreas Färber wrote:
> Calling isa_ide_init() twice with the same IRQ 13 fails:
> 
> qemu: hardware error: isa irq 13 already assigned
> 
> Use a different IRQ (14) for the second one to avoid this.

I am not sure it is actually a good idea. While it fixes the QEMU error,
it breaks the kernel boot which waits for both IDE channels on IRQ 13.
This causes an endless boot, so the machine never finishes to boot:

| ide0 at 0x1f0-0x1f7,0x3f6 on irq 13
| ide1 at 0x170-0x177,0x376 on irq 13 (shared with ide0)
| hda: max request size: 512KiB
| hda: 20971520 sectors (10737 MB) w/256KiB Cache, CHS=16383/255/63
| hda: cache flushes supported
| hda: hda1 hda2
| ide-cd: cmd 0x5a timed out
| hdc: lost interrupt
| ide-cd: cmd 0x5a timed out
| hdc: lost interrupt
| hdc: ATAPI 4X CD-ROM drive, 512kB Cache
| Uniform CD-ROM driver Revision: 3.20
| hdc: lost interrupt
| ide-cd: cmd 0x3 timed out
| hdc: lost interrupt
| ide-cd: cmd 0x3 timed out
| hdc: lost interrupt
| hdc: lost interrupt
| ...

As a temporary workaround it seems better to disable the second IDE
channel, this solution works. 

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