If you tried every way on output to Linux kernel, but nothing work. Probably that’s because SPCR(Serial Port Console Redirection Table), and this option default is enable.
Just disable it in your BIOS and add “console=tty0” to /etc/default/grub, then update grub.cfg. it will work.
In AMI BIOS, it should be in the Advanced->Serial Port Console Redirection->Console Redirection
Set it to [Disabled]
Some Linux distrubtions might not use GRUB_CMDLINE_LINUX in the file /etc/default/grub with grub paramater GRUB_ENABLE_BLSCFG=true, if you this parameter in th e grub.cfg file, please disable it.
ref.
[RFC PATCH v2 0/3] Prefer working VT console over SPCR and device-tree chosen stdout-path
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