The character device we currently have is cumbersome to use.
The Linux way to access it at /sys/firmware/qemu_fw_cfg
is much nicer to use, so this series adds support for a similar
FS to barebox.
A very nice result of having file system access to the QEMU variables
in barebox is that we get a trivial way to pass data to barebox.
To make it even more convenient to use, this series enables overriding
individual files in the environment via the new mechanism, e.g.:
pytest --env nv/boot.default=fit --env boot/fit=@boot.sh
v1 -> v2:
- drop already upstream patches
- drop truncate (Sascha)
- make writing files besides "raw" an error (Sascha)
- mount file system unconditionally, so environment can be read
from it
Ahmad Fatoum (4):
fs: add qemu_fw_cfg file system
firmware: qemu_fw_cfg: register at device initcall level
video: ramfb: use new qemu fw_cfg FS
fs: qemu_fw_cfg: support populating environment via QEMU fw_cfg
conftest.py | 22 ++
defaultenv/defaultenv.c | 22 ++
drivers/firmware/qemu_fw_cfg.c | 2 +-
drivers/video/Kconfig | 2 +-
drivers/video/ramfb.c | 98 ++------
fs/Kconfig | 7 +
fs/Makefile | 1 +
fs/qemu_fw_cfg.c | 446 +++++++++++++++++++++++++++++++++
include/envfs.h | 5 +
include/string.h | 5 +
10 files changed, 525 insertions(+), 85 deletions(-)
create mode 100644 fs/qemu_fw_cfg.c
--
2.39.5
