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- # SPDX-License-Identifier: GPL-2.0-or-later
- # BeagleBone native GPIO interface for SWD
- #
- # This is best used with a fast buffer but it is also suitable for a direct
- # connection if the target voltage matches the host's IO voltage (typically
- # 3.3V) and the cable is short.
- #
- # DO NOT APPLY VOLTAGE TO THE GPIO PINS UNTIL SYS_RESETN IS HIGH.
- #
- # Do not forget the GND connection.
- adapter driver am335xgpio
- # Transition delay calculation: SPEED_COEFF/khz - SPEED_OFFSET
- # These depend on the system clock, calibrated for stock 1 GHz BeagleBoneBlack
- # am335xgpio speed SPEED_COEFF SPEED_OFFSET
- am335xgpio speed_coeffs 600000 575
- # BeagleBone pin P9_22
- adapter gpio swclk 2 -chip 0
- # BeagleBone pin P9_18
- adapter gpio swdio 4 -chip 0
- # BeagleBone pin P9_12
- adapter gpio swdio_dir 28 -chip 1
- # USR0 LED
- adapter gpio led 21 -chip 1
- # BeagleBone pin P8_18
- adapter gpio srst 1 -chip 2
- reset_config srst_only srst_push_pull
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