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| author | Marc Reilly <marc@cpdesign.com.au> | 2012-08-20 09:46:07 +1000 |
|---|---|---|
| committer | Freddie Chopin <freddie.chopin@gmail.com> | 2012-09-26 16:16:17 +0000 |
| commit | fe52282c37cc0c4ab9863e95ef6970e6fad540b4 (patch) | |
| tree | 62fe800ed0fac86ad3d286774b61be2b48cca8fa /tcl | |
| parent | a4830e7a6ad0c6bf954184894a0dbec74075306b (diff) | |
| download | riscv-openocd-fe52282c37cc0c4ab9863e95ef6970e6fad540b4.zip riscv-openocd-fe52282c37cc0c4ab9863e95ef6970e6fad540b4.tar.gz riscv-openocd-fe52282c37cc0c4ab9863e95ef6970e6fad540b4.tar.bz2 | |
drivers: new jtag bitbang driver using sysfs gpio
This driver implements a bitbang jtag interface using gpio lines exported via
sysfs.
The aim of this driver implementation is to use system GPIOs but to avoid the
need for an additional kernel driver.
A config suitable for RaspberryPi is included.
Change-Id: Ib2acf720247a219768d1cbfeebd88057ed2d7b8b
Signed-off-by: Marc Reilly <marc@cpdesign.com.au>
Reviewed-on: http://openocd.zylin.com/762
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Tested-by: jenkins
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
Diffstat (limited to 'tcl')
| -rw-r--r-- | tcl/interface/sysfsgpio-raspberrypi.cfg | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/tcl/interface/sysfsgpio-raspberrypi.cfg b/tcl/interface/sysfsgpio-raspberrypi.cfg new file mode 100644 index 0000000..105173c --- /dev/null +++ b/tcl/interface/sysfsgpio-raspberrypi.cfg @@ -0,0 +1,24 @@ +# +# Config for using RaspberryPi's expansion header +# +# This is best used with a fast enough buffer but also +# is suitable for direct connection if the target voltage +# matches RPi's 3.3V +# +# Do not forget the GND connection, pin 6 of the expansion header. +# + +interface sysfsgpio + +# This has no effect on the driver, but is required +adapter_khz 100 + +# Each of the JTAG lines need a gpio number set: tck tms tdi tdo +# Header pin numbers: 23 22 19 21 +sysfsgpio_jtag_nums 11 25 10 9 + +# At least one of srst or trst needs to be specified +# Header pin numbers: TRST - 26, SRST - 18 +sysfsgpio_trst_num 7 +# sysfsgpio_srst_num 24 + |