Not enough info, I'll guess that manjaro is on emmc, manjaro has a somewhat defective uboot
3 methods, disable emmc (for 2-3s at boot), serial to interrupt boot, write another uboot to emmc
(IMPORTANT -- if you write another uboot, be aware the pinebook is NOT pinebookpro, the uboot has quite different locations, get the right one)
probably disabling emmc is easiest, start with lsblk (SD inserted) to see what you want,
then power-off, flip switch, start, flip switch after 2-3s, lsblk again to see if you got timing right
The new image will have a new uboot in the 1st 16M, which will replace the one on the emmc
I am assuming that a SD boot will look different than an emmc boot,
but lsblk will show where / is locacted, if you are paying attention
another warning
the hinges are fragile when back is off, don't move screen or you may break it (hinge screw inserts)
3 methods, disable emmc (for 2-3s at boot), serial to interrupt boot, write another uboot to emmc
(IMPORTANT -- if you write another uboot, be aware the pinebook is NOT pinebookpro, the uboot has quite different locations, get the right one)
probably disabling emmc is easiest, start with lsblk (SD inserted) to see what you want,
then power-off, flip switch, start, flip switch after 2-3s, lsblk again to see if you got timing right
The new image will have a new uboot in the 1st 16M, which will replace the one on the emmc
I am assuming that a SD boot will look different than an emmc boot,
but lsblk will show where / is locacted, if you are paying attention
another warning
the hinges are fragile when back is off, don't move screen or you may break it (hinge screw inserts)