JTAG connection fails after updated to Debian12 (Bookworm)

[danergo]

myinterface.cfg:

adapter driver bcm2835gpio                                                                                                                                                                                         
                                                                                                                                                                                                                   
# Set speed                                                                                                                                                                                                        
adapter speed 10                                                                                                                                                                                                   
                                                                                                                                                                                                                   
# Base address of I/O port                                                                                                                                                                                         
bcm2835gpio peripheral_base 0x3F000000                                                                                                                                                                             
                                                                                                                                                                                                                   
# Clock scaling                                                                                                                                                                                                    
bcm2835gpio speed_coeffs 194938 48                                                                                                                                                                                 
                                                                                                                                                                                                                   
# JTAG                tck tms tdi tdo                                                                                                                                                                              
adapter gpio tck 31                                                                                                                                                                                                
adapter gpio tms 14                                                                                                                                                                                                
adapter gpio tdi 29                                                                                                                                                                                                
adapter gpio tdo 30                                                                                                                                                                                                
                                                                                                                                                                                                                   
# Set transport                                                                                                                                                                                                    
transport select jtag

Board is a CM3. GPIO:

# gpio readall
+-----+------+-------+      +-----+------+-------+
| Pin | Mode | Value |      | Pin | Mode | Value |
+-----+------+-------+      +-----+------+-------+
|   0 | IN   | High  |      |  27 | IN   | High  |
|   1 | IN   | High  |      |  28 | OUT  | High  |
|   2 | IN   | High  |      |  29 | IN   | Low   |
|   3 | IN   | High  |      |  30 | IN   | Low   |
|   4 | IN   | High  |      |  31 | IN   | Low   |
|   5 | IN   | High  |      |  32 | IN   | Low   |
|   6 | IN   | High  |      |  33 | IN   | Low   |
|   7 | OUT  | High  |      |  34 | IN   | High  |
|   8 | OUT  | High  |      |  35 | IN   | High  |
|   9 | ALT0 | Low   |      |  36 | OUT  | Low   |
|  10 | ALT0 | Low   |      |  37 | IN   | Low   |
|  11 | ALT0 | Low   |      |  38 | IN   | Low   |
|  12 | IN   | Low   |      |  39 | IN   | Low   |
|  13 | IN   | Low   |      |  40 | ALT5 | High  |
|  14 | ALT0 | High  |      |  41 | ALT5 | High  |
|  15 | ALT0 | High  |      |  42 | IN   | Low   |
|  16 | ALT3 | Low   |      |  43 | IN   | Low   |
|  17 | ALT3 | High  |      |  44 | OUT  | High  |
|  18 | OUT  | High  |      |  45 | IN   | Low   |
|  19 | IN   | Low   |      |  46 | IN   | High  |
|  20 | IN   | Low   |      |  47 | OUT  | High  |
|  21 | IN   | Low   |      |  48 | ALT0 | Low   |
|  22 | IN   | Low   |      |  49 | ALT0 | High  |
|  23 | IN   | Low   |      |  50 | ALT0 | High  |
|  24 | IN   | High  |      |  51 | ALT0 | High  |
|  25 | IN   | High  |      |  52 | ALT0 | High  |
|  26 | IN   | High  |      |  53 | ALT0 | High  |
+-----+------+-------+      +-----+------+-------+

Command:

openocd -c "debug_level 2" -f interface/myinterface.cfg -f target/ti_cc26x2.cfg -c "program $FIRMWARE verify exit"

Output:

Open On-Chip Debugger 0.12.0
Licensed under GNU GPL v2
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
debug_level: 2

jtag
cortex_m reset_config vectreset

Info : BCM2835 GPIO JTAG/SWD bitbang driver
Info : clock speed 10 kHz
Error: JTAG scan chain interrogation failed: all zeroes
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway...
Error: cc26x2.jrc: IR capture error; saw 0x00 not 0x01
Warn : Bypassing JTAG setup events due to errors
Info : starting gdb server for cc26x2.cpu on 3333
Info : Listening on port 3333 for gdb connections
Error: JTAG scan chain interrogation failed: all zeroes
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway...
Error: cc26x2.jrc: IR capture error; saw 0x00 not 0x01
Warn : Bypassing JTAG setup events due to errors
** Programming Started **
Error: Target not examined yet
Error: auto_probe failed
** Programming Failed **
shutdown command invoked

Target is a CC2652R1F, wires have been checked.

Also, this used to work earlier before we have upgraded Debian to Bookworm.

Also, before issuing openocd command, we reset the target with

gpio write $RST_GPIO 0; sleep 0.5; gpio write $RST_GPIO 1; sleep 1

What do you suggest?

[danergo]

ping

[P33M]

ping

Are you familiar with the concept of a "week-end"?

[P33M]

Since the following upstream commit:

commit da434d7d5975c1c7ebae8e35eb71b6d2d6ad062e
Author: Paul Fertser <fercerpav@gmail.com>
Date:   Sat Oct 9 23:32:01 2021 +0300

    jtag: drivers: bcm2835gpio: don't allow GPIOs > 31

    Current code assumes all the GPIO signals are manipulated via a single
    32-bit register so using higher GPIOs silently fails.

    Fix the check instead of trying to handle additional GPIOs (available on
    Raspberry Pi Compute Modules) as that would slow the driver down.

    Change-Id: Ib3b5864afb3b972d952f9b74665201cd93924959
    Signed-off-by: Paul Fertser <fercerpav@gmail.com>
    Reviewed-on: https://review.openocd.org/c/openocd/+/6658
    Tested-by: jenkins
    Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

openocd will not configure GPIOs > 31. Nor will it warn you that it refused to do so, which is arguably a bug.
That said, I'm not sure why it worked in Buster at all - the commit claims the GPIO accessors didn't handle indices >31 anyway.

As this is an unmodified upstream change, it should be reported to their mailing list - https://openocd.org/doc-release/doxygen/bugs.html

Your other option is to build and install openocd locally, reverting to an earlier version that works.

[P33M]

Another possibility, which doesn't require recompilation or bisecting, is to use the linuxgpiod driver instead of the bcm2835 bitbasher. This will support all the GPIOs that a gpiochip exports. As you're running at 10kHz the slower performance (up to ~1MHz) won't be an issue.

See here for its config options and example - https://openocd.org/doc/html/Debug-Adapter-Configuration.html

[danergo]

adapter gpio tck 31                                                                                                                                                                                                
adapter gpio tms 14                                                                                                                                                                                                
adapter gpio tdi 29                                                                                                                                                                                                
adapter gpio tdo 30    

None of the gpios here are above 31!

Please confirm! Shall they all below or equal to 31?
Or shall they all below 31?

Thank you!

[danergo]

Okay, now I changed the interface config to:

# Set speed
adapter speed 10

adapter driver linuxgpiod

adapter gpio srst 28 -chip 0
adapter gpio tdo 30 -chip 0
adapter gpio tck 31 -chip 0
adapter gpio tms 14 -chip 0
adapter gpio tdi 29 -chip 0

# Set transport
transport select jtag

Output:

Open On-Chip Debugger 0.12.0
Licensed under GNU GPL v2
For bug reports, read
        http://openocd.org/doc/doxygen/bugs.html
debug_level: 2

jtag
cortex_m reset_config vectreset

Info : Linux GPIOD JTAG/SWD bitbang driver
Info : This adapter doesn't support configurable speed
Error: JTAG scan chain interrogation failed: all zeroes
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway...
Error: cc26x2.jrc: IR capture error; saw 0x00 not 0x01
Warn : Bypassing JTAG setup events due to errors
Info : starting gdb server for cc26x2.cpu on 3333
Info : Listening on port 3333 for gdb connections
Error: JTAG scan chain interrogation failed: all zeroes
Error: Check JTAG interface, timings, target power, etc.
Error: Trying to use configured scan chain anyway...
Error: cc26x2.jrc: IR capture error; saw 0x00 not 0x01
Warn : Bypassing JTAG setup events due to errors
** Programming Started **
Error: Target not examined yet
Error: auto_probe failed
** Programming Failed **
shutdown command invoked

[lurch]

Target is a CC2652R1F

AFAIK this https://github.com/raspberrypi/openocd repo was only created to add support for RP2040 and RP2350 to openocd. For any other target, you should probably be using the upstream version of openocd? (and be reporting bugs there too)

openocd will not configure GPIOs > 31

#117 claims to fix that, but I've not tested it.