This is late kernel degradation problem report.
I'm late reporning this, so please forgive me, my server is not reboot often and
when i discovered the problem i was in hope what it will be fixed soon, but
several mounths later next reboot showed me the problem again. I did quick
diagnose of problem, and again late posting it here the results. I also made a
quick search of bugs with fedora kernels containing 680 word - nothing valuable
was found, so or it is nobody now use sil680 driver or i found uncommon bug.
This all, late reporting, uncertain kernel version when trouble begins, rare
hardware, makes possible solution harder, but please help me.

Description of problem:
After kernel update, during boot process, the following kernel messages are
showed in section Actual results, and the hard disks on Silicon Image 0680 IDE
controller are not accessible.
Trying to give 'irqpoll' option as suggested to kernel, nothing really was
changed. Actual results2 section shows it.
Than I tried to boot wihout 'silent' kernel option, and the long result of it is
attached to this message.

Previous version of kernel boots just ok.
No hardware changes was made.

Version-Release number of selected component (if applicable):

The 'ok' kernel version is 2.6.23.15-137.fc8
The wersion of the first buggy kernel is not exactly known, but I suppose that
is several kernel updates later (no longer than month period).
The kernel that I used for data collection is 2.6.25.4-10 or previous.

If I had access to all sequence of the updated kernels during period (the
repository does not store previous versions of kernels) I could try to find last
working and fist not working kernel by the division unknown by half method.

How reproducible:
Every time, but there nust be Silicon Image 0680 based IDE controller available.
And also, probably same hardware configuration.

Steps to Reproduce:
1. Install fedora 8
2. Check normal boot
3. Update kernel to last version
4. Check sil680 driver load messages
  
Actual results:
ata3.00: cmd c8/00:08:00:00:00/00:00:00:00:00/e0 tag 0 dma 4096 in
ata3.00: status: { DRDY }
ata3.01: revalidation failed (errno=-2)
ata3.01: revalidation failed (errno=-2)
irq 11: nobody cared (try booting with the "irqpoll" option)
handlers:
[<f08e1966>] (ata_interrupt+0x0/0x1ba [libata])
Disabling IRQ #11
ata3.01: revalidation failed (errno=-2)
ata3.00: revalidation failed (errno=-5)
ata3.00: revalidation failed (errno=-22)
ata3.00: revalidation failed (errno=-5)
Buffer I/O error on device sdd, logical block 0
...9 times...
ata4.00: cmd c8/00:08:00:00:00/00:00:00:00:00/e0 tag 0 dma 4096 in
ata4.01: status: { DRDY }
ata4.01: revalidation failed (errno=-2)
ata4.01: revalidation failed (errno=-2)
ata4.01: revalidation failed (errno=-5)
ata4.00: revalidation failed (errno=-2)
ata4.00: revalidation failed (errno=-2)
ata4.00: revalidation failed (errno=-5)
Buffer I/O error on device sde, logical block 0
...9 times...
Buffer I/O error on device sdd, logical block 3001520
...2 times...
...
Starting udev: ata_id[645]: main HDIO_GET_IDENTITY failed for '/dev/.tmp-8-48'
ata_id[649]: main: HDIO_GET_IDENTITY failed for '/dev/.tmp-8-64'
                                                           [  OK  ]

Actual results2:
ata3.00: cmd c8/00:08:00:00:00/00:00:00:00:00/e0 tag 0 dma 4096 in
ata3.00: status: { DRDY }
ata3.01: revalidation failed (errno=-2)
ata3.01: revalidation failed (errno=-2)
ata3.01: revalidation failed (errno=-5)
ata3.00: revalidation failed (errno=-5)
ata3.00: revalidation failed (errno=-5)
ata3.00: revalidation failed (errno=-2)
Buffer I/O error on device sdd, logical block 0
...9 times...
ata4.00: cmd c8/00:08:00:00:00/00:00:00:00:00/e0 tag 0 dma 4096 in
ata4.00: status: { DRDY }
ata4.01: revalidation failed (errno=-2)
ata4.01: revalidation failed (errno=-2)
ata4.01: revalidation failed (errno=-2)
ata4.00: revalidation failed (errno=-5)
ata4.00: revalidation failed (errno=-5)
ata4.00: revalidation failed (errno=-2)
Buffer I/O error on device sde, logical block 0
...9 times...
Buffer I/O error on device sdd, logical block 3001520
...2 times...
...
Starting udev: ata_id[644]: main HDIO_GET_IDENTITY failed for '/dev/.tmp-8-48'
ata_id[648]: main: HDIO_GET_IDENTITY failed for '/dev/.tmp-8-64'
                                                           [  OK  ]

Expected results:
normal boot

Additional info:
Here is my hardware configuration
http://www.smolts.org/client/show/pub_5e295b1d-bfcc-4217-a47a-ce36ceca6f77