Re: porting IDE patches to PATA driver

[Robert Hancock <hancockrwd@gmail.com>]

On 07/03/2009 03:50 AM, Andrei Martynov wrote:
> Monday, June 29, 2009, 4:53:49 PM, Alan Cox wrote:
>
>> The only other thing I can see is the way it hangs around waiting a bit
>> for the DMA to finish after the DMA completion event occurs - that might
>> be your problem if they goofed and reported DMA complete too early.
>
> Thank you very much for your advices. Reading from disk works fine now
> but writing attempt results in a series of similar error messages.
> What is the meaning of this error? Is there any documentation that may
> be useful to understand libata error messages?
>
> ~ # cp /hdd/c/Test/test.dat /hdd/d
> ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
> ata1.00: BMDMA stat 0x6

BMDMA status 0x6 means DMA failed because the adapter encountered an 
error transferring data to/from host memory (from the PCI ATA host 
adapter spec). Some problem in the adapter setup?

> ata1.00: cmd 35/00:98:40:6f:fe/00:01:20:00:00/e0 tag 0 dma 208896 out
>           res 50/00:00:d7:70:fe/00:00:20:00:00/e0 Emask 0x20 (host bus error)
> ata1.00: status: { DRDY }
> jasper_set_piomode: devno = 0
> jasper_tune_chipset: slave = 0 speed = 0x0c
> jasper_set_dmamode: devno = 0
> jasper_tune_chipset: slave = 0 speed = 0x22
> ata1.00: configured for MWDMA2
> ata1: EH complete
> sd 0:0:0:0: [sda] 586070255 512-byte hardware sectors (300068 MB)
> sd 0:0:0:0: [sda] Write Protect is off
> sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
> sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
> ata1.00: BMDMA stat 0x6
> ata1.00: cmd 35/00:a0:b0:72:fe/00:01:20:00:00/e0 tag 0 dma 212992 out
>           res 50/00:00:4f:74:fe/00:00:20:00:00/e0 Emask 0x20 (host bus error)
> ata1.00: status: { DRDY }
> jasper_set_piomode: devno = 0
> jasper_tune_chipset: slave = 0 speed = 0x0c
> jasper_set_dmamode: devno = 0
> jasper_tune_chipset: slave = 0 speed = 0x22
> ata1.00: configured for MWDMA2
> ata1: EH complete
>
>