via 6421 hangs with 2 disks attached

[Oltion Kola <oltion.kola@myself.com>]

Hi,

I have a problem with my pci sata controller with a via chipset:

When i attach 2 disks to the controller, the kernel hangs at the moment 
it detects the 2 disks. I can not attach logs as the system is 
unresponsive after that. With only one disk everything is ok.

Tested with all kernels.

This is my pci print for the card:

01:06.3 RAID bus controller: VIA Technologies, Inc. VT6421 IDE/SATA 
Controller (rev 50)
     Subsystem: VIA Technologies, Inc. VT6421 IDE/SATA Controller
     Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
     Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR+ INTx-
     Latency: 64
     Interrupt: pin A routed to IRQ 18
     Region 0: I/O ports at dd60
     Region 1: I/O ports at dd70
     Region 2: I/O ports at dd80
     Region 3: I/O ports at dd90
     Region 4: I/O ports at dde0
     Region 5: I/O ports at de00
     Expansion ROM at fea00000 [disabled]
     Capabilities: [e0] Power Management version 2
         Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
         Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-

I have put some information also in 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/570434 as it is an 
old bug.

Let me know if I can do anything to help.

Thanks.