Attention is currently required from: Xiang Wang, Stefan Reinauer, Angel Pons.

Xiang Wang uploaded patch set #11 to this change.

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sysfsgpio.c implement spi interface via linux sysfs

Linux can operate gpio through sysfs, this patch implements a bitbang
spi interface through sysfs. Through this patch, some SBC can be used
as flash programmers.

TEST=build and run flashrom with sysfsgpio on raspberrypi to read  W25Q128.V

Change-Id: I1bc47ef8011bba560326b501a80869340bb9f733
Signed-off-by: Xiang Wang <merle@hardenedliux.org>
---
M Makefile
M flashrom.c
M meson.build
M meson_options.txt
M programmer.h
A sysfsgpio.c
6 files changed, 287 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/54/49254/11

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