You might want to have an UART connection handy.
Or if that's not a possibility, the first thing you should probably do is building an initramfs with the modules required for the display so you can get output earlier during boot; no need to rebuild the kernel. Beware, though, that the default boot.txt on Manjaro doesn't seem to properly load the initramfs. The linked thread by limxr and/or https://github.com/lsfxz/pinebookpro-thi...aster/luks might help (the latter was initially a gist elsewhere, should give you some hints about where to look / modify things).
Or if that's not a possibility, the first thing you should probably do is building an initramfs with the modules required for the display so you can get output earlier during boot; no need to rebuild the kernel. Beware, though, that the default boot.txt on Manjaro doesn't seem to properly load the initramfs. The linked thread by limxr and/or https://github.com/lsfxz/pinebookpro-thi...aster/luks might help (the latter was initially a gist elsewhere, should give you some hints about where to look / modify things).
