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I know it’s possible to rotate video output in X server to display in portrait mode as well as landscape.
I’m curious if it’s possible to rotate the video output that occurs pre-X server. The white text on black background output as the machine boots (rc.sysinit, bringing up eth connections, etc.).
if you use the framebuffer-console you can use the
fbcon=rotate:ncommand at boot time to rotate the console output.(n = 0: no rotation, n=1 90deg clockwise, n=2 upside down, n=3: 90deg counterclockwise)
The framebuffer options are documented in the kernel source in the file