[syslinux] boot... round 2

H. Peter Anvin hpa at zytor.com
Wed Jul 1 23:13:23 PDT 2015


On 07/01/2015 03:12 AM, Gene Cumm wrote:
> On Tue, Jun 30, 2015 at 5:39 PM, H. Peter Anvin <hpa at zytor.com> wrote:
>> On 06/30/2015 01:52 PM, Gene Cumm via Syslinux wrote:
>>>
>>> I should restate: A serial port that responds on BIOS IO port 3F8h
>>> that can reliably operate at 115200 8n1 may be necessary.  A USB
>>> serial port that the BIOS doesn't bother setting up for IO port 3F8h
>>> is just random hardware.
>>>
>>
>> A USB serial port looks completely different from a UART serial port, so
>> that is not really an option.
> 
> I wasn't sure if it's possible (albeit a lot of work that probably
> hasn't been done/implemented by anyone) to have a BIOS use a USB
> serial adapter and emulate a traditional UART.
> 

Yes, it can be done using the same technology that is used to emulate a
classical 8042 keyboard controller using a USB keyboard, that is a
combination of hardware and SMM firmware.

	-hpa



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