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From: Gavin Atkinson <gavin@FreeBSD.org>
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Subject: PCI bus not being scanned (was: Re: SATA drive device moving on 8.0
 current)
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On Sun, 22 Feb 2009, Barney Cordoba wrote:

> Has anyone been able to find what might be causing drives under 8.0 to
> be detected as a different device than under 7?

For some reason, 8.0 is failing to find any devices on pci17.  There are 
tweo devices on that bus inder 7:

> Feb  6 06:34:57 bigby7 kernel: pci17: <ACPI PCI bus> on pcib6
> Feb  6 06:34:57 bigby7 kernel: vgapci0: <VGA-compatible display> port 0x5000-0x50ff mem 0xd0000000-0xd7ffffff,0xd8400000-0xd840ffff irq 22 at device 3.0 on pci17
> Feb  6 06:34:57 bigby7 kernel: atapci0: <ITE IT8213F UDMA33 controller> port 0x5420-0x5427,0x5414-0x5417,0x5418-0x541f,0x5410-0x5413,0x5400-0x540f irq 23 at device 4.0 on pci17
> Feb  6 06:34:57 bigby7 kernel: atapci0: [ITHREAD]
> Feb  6 06:34:57 bigby7 kernel: ata2: <ATA channel 0> on atapci0
> Feb  6 06:34:57 bigby7 kernel: ata2: [ITHREAD]
> Feb  6 06:34:57 bigby7 kernel: ata3: <ATA channel 1> on atapci0
> Feb  6 06:34:57 bigby7 kernel: ata3: [ITHREAD]

but under 8, only the bus itself is detected.

> Feb  6 06:30:48 bigby7 kernel: pci17: <ACPI PCI bus> on pcib6

Again, without a verbose dmesg, it's not really possible to even guess 
what is going wrong here.  How old is the 8.0 you're testing, and do you 
have any idea when this started failing?

Gavin