Hi,
On Wed, Mar 20, 2013 at 10:22 PM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> On Wed, 20 Mar 2013, victor yeo wrote:
>
>> Thanks, i add processing the pending data from FIFO after queue was
>> called. The UDC driver can process the SCSI INQUIRY command and SCSI
>> READ FORMAT CAPACITIES command now.
>>
>> In the processing of SCSI READ FORMAT CAPACITIES command, there is
>> attention condition. Then the bulk transfer stops completely and
>> control transfer is repeated.
>
> What control transfer?
those get descriptor requests.
>> How can i solve it?
>
> First you have to figure out why it isn't working. What does the
> debugging information show?
Here is some debugging information:
receive GET_DESCRIPTOR, 80, 6 index 0 value 200 len 20
receive SET_CONFIGURATION, 0, 9 index 0 value 1 len 0
set curlun->unit_attention_data to SS_NO_SENSE
do_set_config() is called because of FSG_STATE_CONFIG_CHANGE
do_set_interface() is called
set curlun->unit_attention_data to SS_RESET_OCCURRED
receive *UNKNOWN*, a1, fe index 0 value 0 len 1
receive SCSI Inquiry
receive SCSI read format capacities, get attention condition,
curlun->unit_attention_data is 062900 (SS_RESET_OCCURRED)
The gadget code is able to process SCSI Inquiry because it does not
fulfill the if-condition:
if (curlun && curlun->unit_attention_data != SS_NO_SENSE &&
fsg->cmnd[0] != INQUIRY &&
fsg->cmnd[0] != REQUEST_SENSE) {
Why is curlun->unit_attention_data set to SS_RESET_OCCURRED?
Regards,
Victor
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