Pack of CAM improvements

[Yamagi Burmeister]

On Thu, 28 Jan 2010, Alexander Motin wrote:

>>> Yamagi Burmeister wrote:
>>>> ahcich0: is 00000002 cs 00000000 ss 00000000 rs 00000001 tfd 50 serr
>>>> 00000000
>>>> ahcich0: Timeout on slot 0
>>>
>>> Try to disable MSI interrupts with `hint.ahci.0.msi=0`.
>>
>> That fixed the problem. Thank you :)
>
> That's quite strange, as in many other cases IXP700 is working fine.
> Different revisions? What is your `pciconf -lvbc` reports?

When I helped nox@ debugging a problem with timeouts we noticed, that
our controlers are of differend revisions. The pciconf output ist:

ahci0 at pci0:0:17:0:      class=0x010601 card=0x43911002 chip=0x43911002
rev=0x00 hdr=0x00
     vendor     = 'ATI Technologies Inc. / Advanced Micro Devices, Inc.'
     device     = 'SB700 SATA Controller [AHCI mode]'
     class      = mass storage
     subclass   = SATA
     bar   [10] = type I/O Port, range 32, base 0xd000, size  8, enabled
     bar   [14] = type I/O Port, range 32, base 0xc000, size  4, enabled
     bar   [18] = type I/O Port, range 32, base 0xb000, size  8, enabled
     bar   [1c] = type I/O Port, range 32, base 0xa000, size  4, enabled
     bar   [20] = type I/O Port, range 32, base 0x9000, size 16, enabled
     bar   [24] = type Memory, range 32, base 0xfe8ff800, size 1024,
enabled
     cap 01[60] = powerspec 2  supports D0 D3  current D0
     cap 05[50] = MSI supports 4 messages, 64 bit
     cap 12[70] = SATA Index-Data Pair

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