From 25d45da40721d4a5413f796628536b88d4e23c3b Mon Sep 17 00:00:00 2001 From: Jian-Hong Pan Date: Sun, 11 Jul 2021 12:54:39 +0800 Subject: [PATCH] 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 Reviewed-on: http://openocd.zylin.com/6367 Tested-by: jenkins Reviewed-by: Florian Fainelli Reviewed-by: Antonio Borneo --- tcl/board/rpi4b.cfg | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 tcl/board/rpi4b.cfg diff --git a/tcl/board/rpi4b.cfg b/tcl/board/rpi4b.cfg new file mode 100644 index 000000000..5b046af7b --- /dev/null +++ b/tcl/board/rpi4b.cfg @@ -0,0 +1,13 @@ +# 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