13921 2020-05-26 03:59:49 +0000 SERIAL_CONSOLES SERIAL_CONSOLES_CHECK 2024-01-11 18:45:01 +0000 1 1 11 Runtime System Startup system-startup 3.1 All Multiple RESOLVED FIXED Medium+ normal 3.4 M1 1 pokylinux tvgamblin kevin.tian mark.morton randy.macleod --- --- Yes (doc changes required) oldest_to_newest 87332 0 pokylinux 2020-05-26 03:59:49 +0000 It looks like either the docu is missing something, or I misunderstand something I use SERIAL_CONSOLES and SERIAL_CONSOLES_CHECK both for SysVinit and systemd. For systemd according to [2] SERIAL_CONSOLES_CHECK is not needed. The behavior I see is that with systemd on every boot SERIAL_CONSOLES are searched and one is picked from the list. If that's the case it should be documented a bit better. For SysVinit indeed only the first time around SERIAL_CONSOLES_CHECK is used to find some serial console which is written into /etc/inittab. This makes it unsuitable for read-only images and the build breaks if you have SERIAL_CONSOLES_CHECK plus EXTRA_IMAGE_FEATURES += "read-only-rootfs" . (which should be documented as well). Is there a workaround for read-only images e.g. make the one file writeable. [1] https://www.yoctoproject.org/docs/latest/mega-manual/mega-manual.html#var-SERIAL_CONSOLES [2] https://www.yoctoproject.org/docs/latest/mega-manual/mega-manual.html#var-SERIAL_CONSOLES_CHECK 87376 1 tvgamblin 2020-06-01 07:00:31 +0000 Patch is in on master now: https://git.openembedded.org/openembedded-core/commit/?id=982b7f98b8423236cc986346379b1bde3694f131 Closing this as resolved. 87377 2 tvgamblin 2020-06-01 07:01:08 +0000 Closed wrong defect by mistake. 87760 3 tvgamblin 2020-07-14 12:49:12 +0000 After doing some reading, I don't think that there's a way to achieve this, short of using the https://github.com/cmhe/meta-readonly-rootfs-overlay layer or the methods described there (i.e. sym-links for files that need to change). I'll talk to Mark and see about getting documentation added for the incompatibility of read-only rootfs with SERIAL_CONSOLES_CHECK for SysVinit. 90480 4 tvgamblin 2021-05-25 16:29:27 +0000 Added to the docs. See: http://docs.yoctoproject.org/ref-manual/variables.html?highlight=serial_consoles_check 97781 5 pokylinux 2024-01-11 18:45:01 +0000 Just for completeness and since it was removed: https://docs.yoctoproject.org/4.0.15/ref-manual/variables.html?highlight=serial_consoles_check#term-SERIAL_CONSOLES_CHECK