UEFI serial bootloader

[Dima Veselov <kab00m%lich.phys.spbu.ru@localhost>]

Greetings,

I have a server with IPMI serial console on COM2, which fails to show 
serial bootloader in UEFI mode. For testing purposes I am using iPXE 
stack with pxeboot_ia32 with console and serial options installed via 
installboot.

UEFI shows itself on every serial port and monitor simultaneously. If 
standard pxeboot is loaded it shows up on the same devices as UEFI, and
the kernel continues on monitor only, but if pxeboot with com2 option is
used - it does not show up anywhere, but the kernel works on com2.

I've tried to check the problem on KVM VM but it works as intended -
UEFI on all devices, pxeboot on programmed device (monitor or serial),
kernel continues on same as pxeboot.

It would be okay if kernel could have console= boot option, but as far
as I know it does not, so there is no way I can set up both bootloader
and kernel to serial device on real hardware.

Is there any clue to check why it happens or any way to debug pxeboot?

--
Sincerely yours,
Dima Veselov
Physics R&D Establishment of Saint-Petersburg University