Question related to FreeBSD Serial Console...

[Scott Long]

John Birrell wrote:
> On Mon, Sep 01, 2003 at 05:29:09PM -0600, Scott Long wrote:
> 
>>At one time I was working on patches to the loader to make the console
>>speed configurable.  At the time, at least, I didn't see any evidence
>>that the settings were stored in the boot0 block, but maybe I was wrong.
> 
> 
> AFAIK, the boot0 block uses bios int 0x16 to get a key-press and bios int
> 0x10 to display a character, so in a situation where you *want* a serial
> console, the F1 etc stuff can't be used unless the bios supports console
> re-direction. And you have to live with whatever baud rate the bios sets.
> 
> Once you get to boot2, then the serial console can work if set in /boot.config.
> 
> It would be nice to have a boot.config setting for the baud rate. I have a
> board here that allows bios re-direction to either the first or second serial
> port at a fixed baud rate of 38400. I have to build boot2 with
> BOOT_COMCONSOLE_SPEED=38400, and then the kernel with CONSPEED=38400 to
> get all the ducks in a row.
> 
> But it would be even nicer if both boot2 and the kernel would just work with
> whatever baud rate the bios set.
> 

This is exactly the problem that I was working on.

Scott