[coreboot] unexpected exception errors loading vga rom
Joseph Smith
joe at settoplinux.org
Wed Apr 29 05:38:12 CEST 2009
On Mon, 27 Apr 2009 10:14:02 +0200, Stefan Reinauer <stepan at coresystems.de>
wrote:
> On 27.04.2009 9:55 Uhr, Joseph Smith wrote:
>> Well, I have confirmed the problem. Looks there is something crazy about
>> how the ethernet and modem (even though the IP1000 doesn't actually have
> a
>> modem) are setup. If I disable the ICH4 ethernet and enable the AC97
> ICH4
>> modem, sure as shit it boots up everytime (VGA too) and all IRQS look
>> great. If I enable both of them EVERYTHING gets IRQ 0, and I have
> issues.
>> If I enable ethernet and disable the modem (this is the way it should
> be)
>> EVERYTHING gets IRQ 0, and I have issues.....
>>
>> Anyone seen this kind of thing before? I have no idea how to fix this
>> one....
>>
>>
Well now were getting somewhere. It is as I thought. The modem and Ethernet
were not playing nice causing io read/write issues under 0x200, hence the
unexpected exception errors. The IRQ 0 problems also make sense because the
interrupt controllers live in that io area correct? I guess on this board
they were not designed to coincide...there isn't an actual on-board modem
anyways.
So here is what I did to get it working, and this is the part I need help
with.
1. In auto.c I disabled the modem right off through the LPC device:
/* Set the LPC device statically. */
dev = PCI_DEV(0x0, 0x1f, 0x0);
/* Disable Modem. */
pci_write_config8(dev, 0xf2, 0x40);
2. I completely removed the modem code from
src/mainboard/thomson/ip1000/Config.lb
- device pci 1f.6 off end # AC'97 modem
3. Then I completely removed the modem code from
src/southbridge/intel/i82801xx/i82801xx_ac97.c
-static const struct pci_driver i82801db_ac97_modem __pci_driver = {
- .ops = &ac97_ops,
- .vendor = PCI_VENDOR_ID_INTEL,
- .device = PCI_DEVICE_ID_INTEL_82801DB_AC97_MODEM,
-};
And boom :-)
I am booting like a rocket ship in action:-)
I have tried Just step 1 with no luck, and step 1 & 2 with no luck. So
even with the device disabled via the LPC and coreboot something from the
i82801db_ac97_modem() is still partially initializing causing this io
crazyness. I can submit a patch for steps 1-2 but....my question is how can
I completely disable the i82801db_ac97_modem() driver without having to
manually delete code every time I use a new revision???
Maybe a #ifdef to global disable modem define???
--
Thanks,
Joseph Smith
Set-Top-Linux
www.settoplinux.org
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