Is it possible to redirect GRUB2 output to a MMIO serial UART?

For example I have a UART that is displayed in a Linux boot log as:

AMDI0020:01: ttyS5 at MMIO 0xfedca000 (irq = 4, base_baud = 3000000) is a 16550A

To get kernel boot log, I just add this kernel parameter:


But how to redirect GRUB2 output to such kind of UART?

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