Alan Stern,您好！
======= 2006-06-29 11:15:21 您在来信中写道：=======
>Alan Stern,您好！
>
> thanks for your reply!
>
>======= 2006-06-29 00:32:58 您在来信中写道：=======
>
>>On Wed, 28 Jun 2006, JackRain wrote:
>>
>>> linux-usb-users，您好！
>>>
>>> hi,glad to see you again:)
>>>
>>> i would like to ask a question about ： how does mass storage
>>> device cope with unsupported commands,such as 0x23 etc?
>>
>>Many mass storage devices do support that command. It is documented in
>>the UFI specification.
> I mean unsupported command is the command which device
> received from pc host but the device doesn't implement.
> so,i want to know the device how to response this situation.
>
>>> my way is : refering to mass bulk-only spec.(usbmassbulk_10
>>> 6.6.4 command failure),
>>>
>>> The device shall report this condition by returning a Command
>>> Failed status (bCSWStatus = 01h).
>>>
>>> so,i now try :
>>>
>>> 1) return with sense_data 6th,12th,13th:
>>> 0x5,0x24,0x00.
>>
>>You can't return sense data to the host unless the command was REQUEST
>>SENSE.
> I think i was wrong.
>>> 2) return CSW with status (0x01) fail.
>>>
>>> but it seems from bus hound that ,the USB commnication halt a
>>> long time then reset.
>>
>>What mass storage device are you talking about? Do you have any logs you
>>can post?
because I write the device usb firmware by myself,i print
less message only for the software flow chart.
now:
1)when device get READ_FORMAT_CAPCITY(0x23) command ,stall
the bulk-in endpoint.
2)waitting for ep0setup interrupt,and get the clear_feature request \
unstall the endpoint and toggle the DATA pid by
disable then enable the bulk-in endpoint (isp1582)
3)bulk-in endpoint send a ACK signal to PC;
4)then send the CSW to PC to reflect the command status of
this unsupported command
5)EP0TX send a ACK signal to PC
6) bus reset.
7)bulk-out endpoint interrypt occurs,read CBW
if command unsupported ,do the same thing 1~5;
again bus reset.
if command supported ,it's normal and go on processing SCSI protocol.
and I can't see the disk tray icon on windows.
but because bus reset ,the device still won't work.
> the procedure is :
> 1)bulk-out endpoint occurs,read endpoint fifo to get CBW
> 2)decode CBW and found the unsupported command
> 3)how to react if the command I don't want to implement ?
> 4)I tried as i told previously but got bus reset.
>
> I want to know the right way:)
>
>>> another method i have tried is to stall the bulk-in endpoint
>>> then wait host __set feature__ and unstall endpoint.
>>>
>>> this failed again~
>>>
>>> could anyone tell me the correct way ?? thank you very much~
>>
>>According to the specification, you are supposed to stall the bulk-in
>>endpoint (if the Direction bit was set in bmCBWFlags; otherwise you should
>>stall the bulk-out endpoint) and then return CSW status = 1. When the
>>host then sends a REQUEST SENSE command, you should reply with key = 0x5,
>>ASC = 0x24, ASCQ = 0x00.
>
> Shall the endpoint muct be stalled??
>
> thanks you!
>>Alan Stern
>>
>
>= = = = = = = = = = = = = = = = = = = =
>
>
> 致
>礼！
>
>
> JackRain
>[EMAIL PROTECTED]
> 2006-06-29
>
= = = = = = = = = = = = = = = = = = = =
致
礼！
JackRain
[EMAIL PROTECTED]
2006-06-29
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