Re: sata_via: SError: { UnrecovData Proto TrStaTrns }

[Mikael Pettersson <mikpe@it.uu.se>]

Krzysztof Halasa writes:
 > Hi,
 > 
 > What could that be?
 > VIA VT6421A mini-PCI card and SATA SSD from Transcend. IXP425 (ARM)
 > little-endian CPU. 128 MB RAM - VT6421A can access only the first 64 MB
 > of system RAM, but there is bounce buffering (a la swiotlb) for the
 > rest.
 > 
 > Sometimes it produces:
 > 
 > ata1.00: exception Emask 0x12 SAct 0x0 SErr 0x1000500 action 0x6
 > ata1.00: BMDMA stat 0x5
 > ata1: SError: { UnrecovData Proto TrStaTrns }
 > ata1.00: cmd c8/00:20:b7:18:38/00:00:00:00:00/e0 tag 0 dma 16384 in
 >          res 51/40:20:b7:18:38/00:00:00:00:00/e0 Emask 0x12 (ATA bus error)
 > ata1.00: status: { DRDY ERR }
 > ata1.00: error: { UNC }
 > ata1: hard resetting link
 > ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
 > ata1.00: configured for UDMA/100
 > ata1: EH complete

I got (in private) a request to help debug a similar issue
a few months ago:

 > the other problem is vt6421a(SATA port contorller) on ixp425
 > platform with 256MB ram. the driver in 2.6.28 is sata_via.c.
 > the controller has two SATA ports.
 > when i connect one harddisk to IXP425 mainboard, Reading & Writing
 > is all right. but when i connected two drives to the mainboard,
 > and transfer a big file(more than 200MB) from one harddisk to another one. 
 > and the problem will happen.
...
 > ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
 > ata2.00: cmd c8/00:00:3f:d6:02/00:00:00:00:00/e0 tag 0 dma 131072 in
 >          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x24 (host bus error)
 > ata2.00: status: { DRDY }
 > ata2: hard resetting link
 > ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
 > ata2.00: configured for UDMA/133
 > ata2: EH complete
...
 > ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
 > ata1.00: cmd c8/00:20:c7:6a:03/00:00:00:00:00/e0 tag 0 dma 16384 in
 >          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x24 (host bus error)
 > ata1.00: status: { DRDY }
 > ata1: hard resetting link
 > ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
 > ata1.00: configured for UDMA/133
 > ata1: EH complete

I couldn't do much about it other than ask the person to take
it to linux-ide (which I don't think he did), but it does make
one wonder if there is some issue with the vt6421a when connected
to an ixp4xx.