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tcl/board: Add Raspberry Pi 4 model B board 

OpenOCD cannot connect to BCM2711's JTAG interface on RPi 4B board until
the reset configuration mode is set as trst_only.

According to Table 94. GPIO Pins Alternative Function Assignment of
Broadcom's BCM2711 ARM Peripherals datasheet [1] and Raspberry Pi's GPIO
control in config.txt document [2], only Test Reset (TRST) pin (no
System Reset, SRST) is exposed.

[1] https://datasheets.raspberrypi.org/bcm2711/bcm2711-peripherals.pdf
[2] https://www.raspberrypi.org/documentation/configuration/config-txt/gpio.md

Change-Id: I806f0be9700fa0f0944b42c8a651a5731adc762b
Link: http://openocd.zylin.com/#/c/6364/1
Signed-off-by: Jian-Hong Pan <chienhung.pan@gmail.com>
Reviewed-on: http://openocd.zylin.com/6367
Tested-by: jenkins
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Jian-Hong Pan 2021-07-11 12:54:39 +08:00 committed by Antonio Borneo
parent f5aa2e11cd
commit 25d45da407
1 changed files with 13 additions and 0 deletions
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tcl/board/rpi4b.cfg Normal file
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# SPDX-License-Identifier: GPL-2.0-or-later
# This is the Raspberry Pi 4 model B board with BCM2711 chip
# https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711/README.md
#
# Enable JTAG GPIO on Raspberry Pi boards
# https://www.raspberrypi.org/documentation/configuration/config-txt/gpio.md
source [find target/bcm2711.cfg]
transport select jtag
# Raspberry Pi boards only expose Test Reset (TRST) pin, no System Reset (SRST)
reset_config trst_only