Re: pcib allocation failure

On Thursday, May 19, 2011 5:23:42 am deeptech71_at_gmail.com wrote:
> On Tue, May 17, 2011 at 10:40 PM, John Baldwin <jhb_at_freebsd.org> wrote:
> > On Tuesday, May 17, 2011 2:03:42 pm deeptech71_at_gmail.com wrote:
> >> On Tue, May 17, 2011 at 3:44 PM, John Baldwin <jhb_at_freebsd.org> wrote:
> >> > On Saturday, May 14, 2011 12:27:59 pm deeptech71_at_gmail.com wrote:
> >> >> pcib1: <ACPI PCI-PCI bridge> at device 1.0 on pci0
> >> >> pcib1: failed to allocate initial prefetch window: 
0xd0000000-0xfaffffff
> >> >>
> >> >> the console output is cut shortly after those 2 lines (but the machine
> >> >> seems to continue booting, as i have reset'd the machine, after which
> >> >> "/" was found to be improperly dismounted).
> >> >
> >> > So it actually boots fine, but video output breaks during the boot? 
 Does it
> >> > ever come back or it is permanently broken until reboot?
> >>
> >> the video output is permanently broken until reboot (i was able to
> >> gather logs by using delayed rc.d scripts).
> >>
> >> > Your BIOS is actually violating the PCI spec by assigning the same 
resource
> >> > ranges to two devices on the same PCI bus (the hostb device and the AGP 
bridge
> >> > device).  It's also doing so unnecessarily.
> >>
> >> ok, i've tried changing random BIOS settings, and found that changing
> >> "AGP Aperture Size" from 128M to 64M solved the problem with the new
> >> PCI bus driver. (i have a computer with 512MiB of RAM and an AGP video
> >> card with 128MiB of RAM.) weird. any comments on that?
> 
> (also, i have noticed a ~64Mi detraction in resource ranges)
> 
> > Does it still fail to alloc the initial prefetch window in that case?
> 
> hmm! good question, there does seem to be another failure with pcib2,
> although without any noticable effect on the system's functionality:
> pcib2: failed to allocate initial memory window: 0xf7f00000-0xfbffffff
> 
> for the sake of completeness, here r the logs, coming from an r222043
> kernel with the new PCI bus driver:

Yeah, your BIOS continues to behave very poorly.  Please try this hack to see 
if it allows your video to still work with any AGP aperture size:

Index: pci_pci.c
===================================================================
--- pci_pci.c	(revision 222093)
+++ pci_pci.c	(working copy)
_at__at_ -231,7 +231,9 _at__at_ pcib_alloc_window(struct pcib_softc *sc, struct pc
 		    w->name, (uintmax_t)w->base, (uintmax_t)w->limit);
 		w->base = max_address;
 		w->limit = 0;
+#if 0
 		pcib_write_windows(sc, w->mask);
+#endif
 		return;
 	}
 	pcib_activate_window(sc, type);

-- 
John Baldwin