On 05.09.2018 21:12, Jung-uk Kim wrote: > Put this line in /etc/make.conf. > > BOOT_BOOT0_COMCONSOLE_SPEED=0 > > Then, boot0sio will not change serial port configuration. I've tried this, and it doesn't help. Maybe, BIOS reset settings before calling boot code. -- // Lev Serebryakov