[SeaBIOS] Commit d6728f301d7e ("add serial console support") causes double-printing

Gerd Hoffmann kraxel at redhat.com
Thu Jan 11 10:07:03 CET 2018


> But instead I get the following mess:
>     │  BBoooott  AArrcchh  LLiinnuuxx  ((xx8866__6644))

Seems both seabios and boot loader print to the serial line.

> qemu-system-x86_64 -nodefaults -nographic -serial mon:stdio -cpu kvm64 -enable-kvm -boot d -no-reboot -cdrom archlinux-2018.01.01-x86_64.iso

Try "-display none" instead of "-nographic".

"-nographic" is a shortcut which does several things, one of them is
setting the "-machine graphics=off" guest hint, which in turn enables
the serial console in seabios.


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