[PATCH 3/4] test: document pytest --env and --fs options

[Ahmad Fatoum <a.fatoum@barebox.org>]

These two options are really useful to avoid needless typing in QEMU by
making files and environment variables available to barebox from outside.

Document them outside of the pytest --help text as well.

Signed-off-by: Ahmad Fatoum <a.fatoum@barebox.org>
---
 Documentation/boards/emulated.rst | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/boards/emulated.rst b/Documentation/boards/emulated.rst
index 44e78eef7fe1..602def560120 100644
--- a/Documentation/boards/emulated.rst
+++ b/Documentation/boards/emulated.rst
@@ -59,6 +59,18 @@ more easily::
   # Run tests and pass a block device (here /dev/virtioblk0)
   pytest --lg-env test/arm/virt@multi_v8_defconfig.yaml --blk=rootfs.ext4
 
+For testing, the QEMU fw_cfg and virtfs support is particularly useful::
+
+  # inject boot.sh file in working directory into barebox environment
+  # at /env/boot/fit and set /env/nv/boot.default to fit
+  pytest --lg-env test/arm/virt@multi_v8_defconfig.yaml \
+     --env nv/boot.default=fit --env boot/fit=@boot.sh
+
+  # make available the host's local working directory in barebox as
+  # /mnt/9p/host
+  pytest --lg-env test/arm/virt@multi_v8_defconfig.yaml \
+     --fs host=.
+
 For a complete listing of possible options run ``pytest --help``.
 
 MAKEALL
-- 
2.39.5