umodem0, Cisco USB serial console, and quirks

[Mike Andrews]

On Tue, 19 Sep 2017, Hans Petter Selasky wrote:

> On 09/19/17 18:15, Mike Andrews wrote:
>> <OPEN|TRANSFERRING|STARTED|SHORT_XFER_OK|BDMA_ENABLE|BDMA_NO_POST_SYNC|BDMA_SETUP|CAN_CANCEL_IMMED|DOING_CALLBACK|0> 
>> 12:03:37.726830 usbus4.3 SUBM-BULK-EP=00000082,SPD=FULL,NFR=1,SLEN=0,IVAL=0
>>   frame[0] READ 1024 bytes
>>   flags 0xa <SHORT_XFER_OK|PIPE_BOF|0>
>>   status 0xcf023
>
> Hi,
>
> Look for:
>
> XXXX-BULK-EP=00000082
>
> This is the USB read transfer. The other side is not returning any data, so 
> neither is "cu" printing anything. Maybe you can try to get a similar trace 
> from the system where it works?
>
> Looks to me like some kind of protocol error, that the Cisco USB serial 
> console needs some kind of activation.

Took me a few days to get around to getting usbmon going on Linux.  The 
verbose dump is too large for the list, so:

    https://www.bit0.com/tmp/usbmon-ciscoasa-verbose.txt
    https://www.bit0.com/tmp/usbmon-ciscoasa.txt