Bugs item #3587834, was opened at 2012-11-16 01:57
Message generated for change (Comment added) made by joerg_wunsch
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: svenq (svenq)
Assigned to: Nobody/Anonymous (nobody)
Summary: Avarice dies with timeout upon memory read

Initial Comment:
Avarice dies with a receive timeout when reading memory from an ATMega32u4 via 
JTAG, after apparently correct initialization.

MCU: ATMEGA32U4
Tools: AVR JTAG ICE mkII, FW 7.28 or FW 6.x
Avarice 2.10, 2.12 or 2.13 on Gentoo Linux or Debian Linux
avr-gdb 7.2 or 7.6

Same setup works with AVR Studio 6

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>Comment By: Joerg Wunsch (joerg_wunsch)
Date: 2012-11-16 09:18

Message:
The main difference between both appears to be the use of the undocumented
command 0x36, rather than the old CMND_SET_DEVICE_DESCRIPTOR.  So far, I
assumed command 0x36 is only used for Xmega device, but perhaps it is to
be
used in general now.

In addition to the already known usage (with a 0x0002 as the initial value
of the
configuration record), it seems the IO register bitmaps are also configured
through
command 0x36, but with initial values 0x0080, 0x0081, 0x0088, 0x0089.

This configuration method looks very similar to what the JTAGICE3 uses (see
the
respective feature request and attached USB trace).

----------------------------------------------------------------------

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