RZ/G OpenOCD Information
â RZ-G
Introduction
This page provides a guide to use OpenOCD and compatible JTAG debugger devices on RZ/G2 platforms.
Target Device
- RZ/G2L SMARC evaluation board
- RZ/G2E Rev C (or newer)
- RZ/G2M-N-H HiHope rev3 (or newer)
Overview
OpenOCD is an opensource software that provides on-chip programming and debugging feature, with support from compatible JTAG hardware debugger devices.
Prerequisites
A compatible JTAG hardware debugger device is required. Different JTAG devices can have slightly different procedure.
As an example, following guidance is for:
Environment
Below illustration shows how user should connect RZ/G2 platform with JTAG debugger and OpenOCD (run on a Linux Host PC). Note that most RZ/G2 development board has 10 pin JTAG header, so a JTAG converter (20pin-10pin) is required, for example the Olimex ARM-JTAG-20-10. The following pictures illustrates how to setup the environment with a Flyswatter2 and a EK874 (RZ/G2E) board. The setup is similar if other JTAG debuggers and/or devices are used.
Hardware setup
After connecting the devices as per guide in the previous section, follow below instructions to use OpenOCD and JTAG debugger. You must change the switches setting on development board to enable the JTAG debugging feature. The switches setting may be different for each development board. Please refer to the relevant board manual or user guide for detailed information.
SMARC RZ/G2L board
Change switches as per below.
- SW1: OFF - OFF
EK874 RZ/G2E board
Change switches as per below. Note that board version 3 (Rev C) or later must be used.
- SW12: change bit 4 and 5 to OFF to enable JTAG
- SW50: change to (2-3) side
- SW51: change to (1-2) side
HiHope RZ/G2M-N-H board
Change switches as per below. Note that board version 3 (Rev C) or later must be used.
- SW1003: change bit 4 to OFF to enable JTAG
- SW305: change to (2-3) side
- SW2405: change to (1-2) side
OpenOCD setup
Make sure you have all the necessary packages installed:
$sudo apt-get install libtool pkg-config texinfo libusb-dev libusb-1.0.0-dev libftdi-dev autoconf
Download OpenOCD
You can get latest OpenOCD software from the repository:
$ git clone https://github.com/ntfreak/openocd $ cd openocd
Configure, build and install OpenOCD
Next, follow instruction from github to build openocd.
$ ./bootstrap $ ./configure --prefix ${PWD}/installdir $ make $ make install
OpenOCD binaries can be found in the installdir/bin directory.
In configuration, you may need to add option â--enable-ftdiâ to ensure ftdi related function (which Flyswatter2 uses) will be built. Same for J-Link, with â--enable-jlinkâ, however both should be recognized and added automatically during the configuration phase.
Run openocd
OpenOCD provides many setting scripts for many JTAG debugger and development boards under directory share/openocd/scripts/. Normally two suitable scripts has to be chosen, one for Debugger configuration and one for the development board or chip.
To debug with Flyswatter2 the following scripts is available:
interface/ftdi/flyswatter2.cfg
To debug with J-Link, instead:
interface/jlink.cfg
Then for the RZ/G2 family:
target/renesas_rz_g2.cfg
Finally different commands have to be used to select different devices belonging to the RZ/G2 family:
- SMARC RZ/G2L board: set SOC G2L (default), i.e. -c can be omitted
- EK874 RZ/G2E board: set SOC G2E
- HiHope RZ/G2M board: set SOC G2M
- HiHope RZ/G2N board: set SOC G2N
- HiHope RZ/G2H board: set SOC G2H
So, for example to run OpenOCD and attach to a RZ/G2L device using a Flyswatter 2 JTAG adapter:
$ sudo bin/openocd -f share/openocd/scripts/interface/ftdi/flyswatter2.cfg -c âset SOC G2Lâ -f share/openocd/scripts/target/renesas_rz_g2.cfg
You can modify the renesas_rz_g2.cfg configure file to tweak the clock speed (default 4MHz), for example to increase it to 15MHz:
Adapter speed 15000
If openocd command succeeds, a message like below appears:
Open On-Chip Debugger 0.11.0+dev-00182-gbd1569d1b-dirty (2021-05-25-10:23) Licensed under GNU GPL v2 For bug reports, read http://openocd.org/doc/doxygen/bugs.html G2L G2L - 0 CA57(s), 2 CA55(s), 0 CA53(s), 0 CR7(s), 1 CM33(s) Boot Core - CA55 r9a07g044l.cpu SMP targets: r9a07g044l.a55.0 r9a07g044l.a55.1 init_reset Info : Listening on port 6666 for tcl connections Info : Listening on port 4444 for telnet connections Info : J-Link Lite V9 compiled May 17 2019 10:18:57 Info : Hardware version: 9.00 Info : VTarget = 1.833 V Info : clock speed 4000 kHz Info : JTAG tap: r9a07g044l.cpu tap/device found: 0x6ba00477 (mfg: 0x23b (ARM Ltd), part: 0xba00, ver: 0x6) Info : DAP transaction stalled (WAIT) - slowing down Info : DAP transaction stalled during replay (WAIT) - resending Info : DAP transaction stalled (WAIT) - slowing down Info : r9a07g044l.a55.0: hardware has 6 breakpoints, 4 watchpoints Info : DAP transaction stalled (WAIT) - slowing down Info : DAP transaction stalled during replay (WAIT) - resending Info : r9a07g044l.a55.0 cluster 0 core 0 multi core Info : starting gdb server for r9a07g044l.a55.0 on 3333 Info : Listening on port 3333 for gdb connections Info : starting gdb server for r9a07g044l.m33 on 3334 Info : Listening on port 3334 for gdb connections Info : gdb port disabled
Start debugging
Now that openocd command has succeeded, you can use GDB on your Linux Host PC and attach to GDB Server created by OpenOCD. Note that on the Linux machine there might be several instances of GDB, including the native GDB (x86_64). In order to debug the Cortex-A55 the cross GDB has to be used, normally the one included in the SDK generated by Yocto, target: aarch64-poky-linux. For the Cortex-M33, instead the target has to be arm-none-eabi (to be installed separately).
$ $GDB GNU gdb (GDB) 9.1 Copyright (C) 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "--host=x86_64-pokysdk-linux --target=aarch64-poky-linux". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word".
Different ports are potentially created for the different cores available in the device. For the example above GDB can connect to the port 3333 for the Cortex-A55 (configured in SMP by default) and port 3334 for the Cortex-M33.
(gdb) target remote localhost:3333 Remote debugging using localhost:3333 warning: No executable has been specified and target does not support determining executable automatically. Try using the "file" command. 0x0000000050000000 in ?? () (gdb)
A message similar to the one shown above means that GDB managed to connect to the target and it is ready to accept further commands to debug.