No root filesystem

[Pascal Hofstee]

On Tue, Sep 2, 2008 at 4:33 PM, John Baldwin <jhb at freebsd.org> wrote:
> This explains k8temp.  So my earlier test patch to Christian only checked on
> i386 which is why it didn't find an issue before.  Try the updated patch at
> http://www.FreeBSD.org/~jhb/patches/pcie.patch
>
> This does PCI config reads using both methods and panics if it doesn't get the
> same result.

I had to adjust the patch slightly by actually initializing edata to
-1 to get the kernel to actually build (WARNS was complaining about
possibly uninitialized variable edata). I then booted the resulting
kernel and got the following boot log:

[snip earlier parts of boot log]
acpi0: <090607 RSDT1001> on motherboard
PCIe: Memory Mapped configuration base @ 0xe0000000
ioapic0: routing intpin 9 (ISA IRQ 9) to vector 48
acpi0: [MPSAFE]
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
panic: pci_cfgread(0:24:0, 11, 1) => 0x6, 0xff
cpuid = 0

According to pciconf -lv on a working kernel device 0:24:0 is the following:
hostb0 at pci0:0:24:0:     class=0x060000 card=0x00000000 chip=0x11001022
rev=0x00 hdr=0x00
    vendor     = 'Advanced Micro Devices (AMD)'
    device     = '(K8) Athlon 64/Opteron HyperTransport Technology
Configuration'
    class      = bridge
    subclass   = HOST-PCI

Which matches perfectly with the first previously mentioned missing
devices that are normally attached to pcib0.

-- 
  Pascal Hofstee