guide for serial console & early printk enabling?
on UP Xtreme board,
do have a guide for serial console & early printk enabling? on either Ubuntu or Debian,
just like wiki for UP2:
and 'early printk' is useful when a linux kernel image fail to boot.
I know we can google it but still handy if have a wiki/guide on UP Xtreme's support website.
well, I found on UP Xtreme (cpu is WHL8565U),
debug serial port (in M10 header ) is /dev/ttyS2
tested out on Debian 10, the only necessary update in /etc/default/grub is GRUB_CMDLINE_LINUX, others are not need in most common case;
GRUB_CMDLINE_LINUX="console=tty1 console=ttyS2,115200n8" #GRUB_TERMINAL="serial" #GRUB_TERMINAL_INPUT="console serial" #GRUB_TERMINAL_OUTPUT="gfxterm serial" #GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"
console=tty1, boot time printk msg will not show on monitor, that's the only difference I found.
if u can see output in putty/minicom on host machine, but cannot input by keyboard, check your serial cable's RX/TX connection.
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