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RE: Stall due to babble when reading card ATR from CCID device using UHC

From: Lenthamre Johan
Subject: RE: Stall due to babble when reading card ATR from CCID device using UHCI
Date: Mon, 7 Nov 2011 13:09:25 +0000

Hi Ales,

I'm fairly new to USB at this lower level, and I realized that I used the wrong 
read API call. Since the ATR is of variable size I should've use the 
grub_usb_bulk_read_extended() call. Reading less resulted in babble and reading 
too much in a timeout. Using read_extended() worked fine.

Ales, I also downloaded your EHCI branch; any idea when/if it will support 
companion controllers?

Anyhow, thanks for your input!



-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Aleš Nesrsta
Sent: den 4 november 2011 22:21
To: The development of GNU GRUB
Subject: Re: Stall due to babble when reading card ATR from CCID device using 


AFAIK, the babble is fatal bus error which should not normally occur, so if You 
get it regularly, there is probably something wrong in protocol data / 
parameters / request sent into device.
I expect that only reset of the device or some class-specific reset can help in 
recovery. Try see into related CCID class specification or USB
1.1 specification for bubble recovery.
Unfortunately I don't know USB CCID class device protocol (and I have no time 
to study it yet...), so I cannot help You more.


Lenthamre Johan píše v Čt 03. 11. 2011 v 10:04 +0000:
> Hi,
> When reading card ATR from a CCID device (RDR_to_PC_DataBlock), the bulk-in 
> endpoint is stalled due to babble. I still get the complete ATR though. I've 
> successfully issued other commands, such as PC_to_RDR_GetSlotStatus and read 
> back the result ok. The reader is a 2.0 device plugged into a 1.1 controller 
> using GRUB's UHCI driver. The TD status is 0x18500009; stall + babble. I am 
> not really sure where to go from here or where to start looking. Any hints 
> are appreciated.
> Clear halt doesn't solve the issue.
> BR
> /Johan
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> Johan Lenthamre
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> Security and Defence Solutions
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