CONFIG_DEBUG_UART_PHYS/VIRT for rpi-4

[Nicolas Saenz Julienne]

Hi Laurentiu,

On Thu, 2021-02-18 at 17:16 +0200, Laurentiu-Cristian Duca wrote:
> Hello there,
> 
>   Does anybody know the values of CONFIG_DEBUG_UART_PHYS
> and CONFIG_DEBUG_UART_VIRT for rpi-4 on 64bits
> that should be set in order to have access to earlyprintk and printascii ?

By adding this to the kernel command line you should have early access to the
console logs:

	earlycon=uart8250,mmio32,0xfe215040

This, as long as you're using the serial port exposed on pins 8 and 10 of the
expansion port (see https://pinout.xyz/).

Regards,
Nicolas


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