test_extension.py assumes that no extension is known at test start.
This assumption is wrong because we do not come out of reboot.
A prior test may have already hunted for the extension bootdev.
Remove the invalid assert.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit extends the sandbox to implement a dummy
extension_board_scan() function and enables the extension command in
the sandbox configuration. It then adds a test that checks the proper
functionality of the extension command by applying two Device Tree
overlays to the sandbox Device Tree.
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
[trini: Limit to running on sandbox]
Signed-off-by: Tom Rini <trini@konsulko.com>