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Grub2 UEFI boot and serial console output

From: Matwey V. Kornilov
Subject: Grub2 UEFI boot and serial console output
Date: Wed, 11 Jan 2017 16:27:43 +0300
User-agent: Mozilla/5.0 (X11; Linux i686; rv:45.0) Gecko/20100101 Thunderbird/45.4.0


What is the proper way to output GRUB2 menu to serial rs232 console when UEFI boot is used? I've copy-pasted GRUB_SERIAL_COMMAND="serial --unit=0 --speed=115200" from Google because I didn't find anything else. It doesn't work. Now, reading grub sources, I see that the proper way should probably be something like GRUB_SERIAL_COMMAND="serial efi0".

Could you please point me to proper documentation?

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