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SubjectRe: [PATCH][RFC] Possible PnP BIOS GPF Solution for Sony VAIO and other laptops
On Mon, Feb 03, 2003 at 01:09:57PM +1100, CaT wrote:
> On Sun, Feb 02, 2003 at 08:37:02PM +0000, Adam Belay wrote:
> > The PnP BIOS may be wandering into segement 0x40. If that is the case,
> > this patch should fix the problem. I do not have a buggy system so I
> > cannot test this patch but I'd be intersted to hear the results. If you
> > have a system that has caused pnpbios problems in the past, I recommend
> > you try this patch. If it works, the system will not panic on startup.
> > This patch is against 2.5.59 and separate from my other recent patches.
> This boots fine here. Then again 2.5.59 booted fine aswell. :) I also
> don't get any oopses from reading /proc/bus/pnp stuff as I did before
> when I first reported issues. As with the bootup, I also don't get these
> issues with 2.5.59. (ie 2.5.59 works fine with or without this patch).

This can be explained. When the pnpbios makes a get current resource call
on a buggy system it causes a GPF. In 2.5.59 I designed the pnpbios driver
to avoid making this call when scanning for devices. It uses a get boot
resource call instead.

In other words...

Without this patch, if you made the following change it would panic.

* from devices that are can only be static such as
* those controlled by the "system" driver.
- if (pnp_bios_get_dev_node(&nodenum, (char )1, node))
+ if (pnp_bios_get_dev_node(&nodenum, (char )0, node))
dev = pnpbios_kmalloc(sizeof (struct pnp_dev), GFP_KERNEL);

1 = boot config
0 = current config

Therefore it can be concluded that this patch does indeed solve the problem
for your system :-).

> Sorry for not getting back to you earlier btw... I lost almost a
> fortnights worth of email and yours was amongst them. :/

Thank you for testing my patch.

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