Thank you Gerd,
Can I change somewhere in coreboot to make this UART port stay with original address 0x3e8, instead of 32bit MMIO address?
Sent: Wednesday, January 22, 2020 at 1:53 AM
From: "Gerd Hoffmann" <kra...@redhat.com>
To: "john brown" <john.brown89...@mail.com>
Cc: seabios@seabios.org
Subject: Re: [SeaBIOS] does sercon-port support for memory mapped MMIO 32bit address?
From: "Gerd Hoffmann" <kra...@redhat.com>
To: "john brown" <john.brown89...@mail.com>
Cc: seabios@seabios.org
Subject: Re: [SeaBIOS] does sercon-port support for memory mapped MMIO 32bit address?
Hi,
> But I can't turn on the sercon port for boot menu. Seems that address for
> sercon is u16, only take 16bit address. I use 16bit serial port address
> for coreboot 0x3e8, it is not working.
>
> How to turn on MMIO serial console for boot menu?
Not supported right now. Needs non-trivial changes, sercon code might
have to switch to 32bit mode for mmio access, the registers are
out-of-reach in real mode.
cheers,
Gerd
> But I can't turn on the sercon port for boot menu. Seems that address for
> sercon is u16, only take 16bit address. I use 16bit serial port address
> for coreboot 0x3e8, it is not working.
>
> How to turn on MMIO serial console for boot menu?
Not supported right now. Needs non-trivial changes, sercon code might
have to switch to 32bit mode for mmio access, the registers are
out-of-reach in real mode.
cheers,
Gerd
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