Re: USB da(4) quirks deprecated

Nate Lawson wrote:

>>dmesg:
>>umass0: SigmaTel, Inc. USBMSC Audio Player, rev 1.10/0.01, addr 3
>>umass0: Get Max Lun not supported (IOERROR)
>>Enabling quirks for device
>>da0 at umass-sim0 bus 0 target 0 lun 0
>>da0: <SigmaTel MSCN 0001> Removable Direct Access SCSI-4 device
>>da0: 1.000MB/s transfers
>>da0: 125MB (256001 512 byte sectors: 64H 32S/T 125C)
>>    
>>
>The NO_PREVENT support has been added.  Does this work for you?
>       {
>           {T_DIRECT, SIP_MEDIA_REMOVABLE, "SigmaTel", "MSCN", "*"},
>            /*quirks*/ DA_Q_NO_SYNC_CACHE|DA_Q_NO_PREVENT
>       },
>
>  
>

Yes, it does work :)

I have just got around to trying this pen-drive again and have been 
trying tracking down data corruptions.  If I mount the drive, write a 
file, umount/mount again the file is different.

Using cmp I have found that there are consistent blocks of nulls in the 
written file where data should be. The block is always 0xfff bytes long 
and starts at 0x3000.  I have tried many files and the offsets are 
always the same. All the other data in the file is correct and at the 
right location.

0x3000 -> 0x3fff
0x7000 -> 0x7fff
0xb000 -> 0xbfff
0xf000 -> 0xffff
0x13000 -> 0x13fff
... and so on until the end of the file ...

Any suggestions?


Andy