programmer: Add bitbanging programmer driver for Linux libgpiod
With this driver, any single board computer, old smartphone, etc. with
a few spare GPIOs can be used for flashrom.
Tested by reading of a 2048 kB flash chip on a Qualcomm MSM8916 SoC
@800 MHz, ran the following command:
time flashrom -p linux_gpiod:gpiochip=0,cs=18,sck=19,mosi=13,miso=56 -r test.bin
This command uses /dev/gpiochip0 with the specified GPIO numbers for the
SPI lines. All arguments are mandatory.
Output:
[...]
Found GigaDevice flash chip "GD25LQ16" (2048 kB, SPI) on linux_gpiod.
[...]
real 1m 33.96s
Change-Id: Icad3eb7764f28feaea51bda3a7893da724c86d06
Signed-off-by: Steve Markgraf <steve@steve-m.de>
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/73290
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/include/programmer.h b/include/programmer.h
index b0eac19..6798851 100644
--- a/include/programmer.h
+++ b/include/programmer.h
@@ -76,6 +76,7 @@
extern const struct programmer_entry programmer_internal;
extern const struct programmer_entry programmer_it8212;
extern const struct programmer_entry programmer_jlink_spi;
+extern const struct programmer_entry programmer_linux_gpio_spi;
extern const struct programmer_entry programmer_linux_mtd;
extern const struct programmer_entry programmer_linux_spi;
extern const struct programmer_entry programmer_mstarddc_spi;