Hi everybody,
I wanted to use a Mitsumi FA404M floppy/card reader combo in my Linux PC.
Floppy disk operations and reading from FLASH-card all work well.
The trouble starts when I try to *write* to a FLASH card. After some
megabytes of data the SCSI layer send some error messages and the card
reader refuses to work.
Now to the details:
I have tested on kernel 2.6.8 and 2.6.13, using different motherboards
(Supermicro X6DH3-G2 and AS-Rock P4VT8)
The device contains a Via VT6205 controller chip:
T: Bus=05 Lev=01 Prnt=01 Port=07 Cnt=01 Dev# 2 Spd=480 MxCH= 0
D: Ver= 2.00 Cls=99(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=040d ProdID=6205 Rev= 0.03
S: Manufacturer=VIA Technologies Inc.
S: Product=USB 2.0 Card Reader
S: SerialNumber=000000081822
C:* #lfs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=125us
I have also tested with different CF-cards. It looks like the faster the
flash card the lesser errors I get. But this is just my opinion, I
cannot proof it.
The error I get always looks like
Nov 16 11:21:55 linux kernel: SCSI error : <11 0 0 0> return code = x8000002
Nov 16 11:21:55 linux kernel: Current sdf: sense key Hardware Error
Nov 16 11:21:55 linux kernel: Additional sense: Data phase error
Nov 16 11:21:55 linux kernel: end_request: I/O error, dev sdf, sector 11376
Nov 16 11:21:55 linux kernel: Buffer I/O error on device sdf1, logical
block 11373
Nov 16 11:21:55 linux kernel: lost page write due to I/O error on sdf1
After that all I can do is unplug the device.
I have found some informations on the mailing list archive regarding
similar problems with an external USB hard drive. Therefore it looks to
me like there is a hardware bug in the controller chipset of the drive.
Is there any possibility of tweaking the scsi or usb stack (writing some
magic parameters to /proc or /sys, or so) to get the thing working?
To me it looks like the problems start as soon as the FLASH card (or
maybe scsi layer?) RAM cache is full and real writing starts. At that
moment the transmission speed breaks down.
Any help is welcome. Even somebody recommending me another internal
floppy/card reader combo is welcome (I have tested TEAC FD-CR7 as well,
same problem).
Cheers
Thomas
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