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SubjectRe: 2.6.13 PowerBook boot hang (was Re: 2.6.13-rc7-git2 crashes on iBook)
Sean Neakums writes:
> Andreas Schwab <schwab@suse.de> writes:
>
> > The last change to drivers/pci/setup-res.c (Ignore disabled ROM resources
> > at setup) is breaking radeonfb on iBook G3 (with Radeon Mobility M6 LY).
> > It crashes in pci_map_rom when called from radeonfb_map_ROM. This is
> > probably a dormant bug that was just uncovered by the change.
>
> 2.6.13 hangs on boot on my PowerBook 5.4, reverting the disabled ROM
> patch (appended for confirmation) fixes it. 2.6.13-rc7 was fine.

Same here, on an Apple eMac with Radeon graphics. 2.6.13-rc7 worked fine,
2.6.13 vanilla hangs early in the boot when radeonfb is about to take over
from OF. Reverting the patch below eliminates the hang.

/Mikael

> diff-tree 755528c860b05fcecda1c88a2bdaffcb50760a7f (from 26aad69e3dd854abe9028ca873fb40b410a39dd7)
> Author: Linus Torvalds <torvalds@g5.osdl.org>
> Date: Fri Aug 26 10:49:22 2005 -0700
>
> Ignore disabled ROM resources at setup
>
> Writing even a disabled value seems to mess up some matrox graphics
> cards. It may be a card-related issue, but we may also be writing
> reserved low bits in the result.
>
> This was a fall-out of switching x86 over to the generic PCI resource
> allocation code, and needs more debugging. In particular, the old x86
> code defaulted to not doing any resource allocations at all for ROM
> resources.
>
> In the meantime, this has been reported to make X happier by Helge
> Hafting <helgehaf@aitel.hist.no>.
>
> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
>
> diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
> --- a/drivers/pci/setup-res.c
> +++ b/drivers/pci/setup-res.c
> @@ -53,7 +53,9 @@ pci_update_resource(struct pci_dev *dev,
> if (resno < 6) {
> reg = PCI_BASE_ADDRESS_0 + 4 * resno;
> } else if (resno == PCI_ROM_RESOURCE) {
> - new |= res->flags & IORESOURCE_ROM_ENABLE;
> + if (!(res->flags & IORESOURCE_ROM_ENABLE))
> + return;
> + new |= PCI_ROM_ADDRESS_ENABLE;
> reg = dev->rom_base_reg;
> } else {
> /* Hmm, non-standard resource. */
> -
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