See [YOCTO #13921]
Add details to the SERIAL_CONSOLES_CHECK entry to clarify that it
doesn't work with read-only rootfs.
(From yocto-docs rev: cefd66301a40f9048499879674e467543f704c44)
Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Reviewed-by: Quentin Schulz <foss@0leil.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>