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Date: Wed, 26 Nov 2008 19:26:47 +0100
From: "Leon Woestenberg" <leon.woestenberg@gmail.com>
To: linux-pci@vger.kernel.org, linuxppc-dev@ozlabs.org
Subject: Re: AMCC PPC460EX Canyonlands does not see PCIe end point with only
	non-prefetchable memory (both 2.6.27.7 and -next)
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On Wed, Nov 26, 2008 at 4:25 PM, Leon Woestenberg
<leon.woestenberg@gmail.com> wrote:
> The non-detected end point boot:
>
> pci 0001:80:00.0: scanning behind bridge, config bf8180, pass 0
> PCI: Scanning bus 0001:81
> PCI: Fixups for bus 0001:81
>
Further debugging.

drivers/pci/probe.c:
static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
{
...
	if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))
		return NULL;
...
	/* some broken boards return 0 or ~0 if a slot is empty: */
	if (l == 0xffffffff || l == 0x00000000 ||
	    l == 0x0000ffff || l == 0xffff0000) {
  	printk(KERN_WARNING "--- slot empty?! l == 0x%lx\n", (u32)l);
		return NULL;
	}

It ends up here with l == 0xffffffff.

Note that u-boot finds the end point vendor ID, and Linux on x86 and
Linux on  mpc8316e powerpc also.

Regards,
-- 
Leon