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Re: 8250 memory mapped UART

From: Matthias Lange
Subject: Re: 8250 memory mapped UART
Date: Wed, 1 Mar 2017 10:38:11 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0


On 03/01/2017 08:00 AM, Andrei Borzenkov wrote:
> please test patches from Matthias Lange
> On Wed, Mar 1, 2017 at 9:15 AM, Gailu Singh <address@hidden> wrote:
>> Hi Experts,
>> I am using GRUB2 on intel apollo lake board. This board does not have IO
>> mapped uart instead it has 8250 memory mapped UART.

Could you share some details about the board?

>> GRUB2 does not recognize memory mapped uart and gives error ("serial port
>> COM0 not found). There is a 8250 memory mapped driver available in coreboot.
>> Is it possible to port that driver to Grub2?

My patch set adds support for 8250 MMIO PCI cards. Is the UART on your
board connected via PCI?


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