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?
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
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