Initial boot messages go directly to VGA/MDA video memory
look at
...../arch/i386/boot/compressed/misc.c
and CONFIG_VGA_CONSOLE in
..../arch/i386/kernel/setup.c
btw there is no option to deselect CONFIG_VGA_CONSOLE in 'make config'
you have to #undef it manuall or change config scripts.
At 12:46 PM 7/28/99 -0400, Jeremy Impson wrote:
>
>On Wed, 28 Jul 1999, Vidar Hokstad wrote:
>> On Wed, 28 Jul 1999, Warren Postma wrote:
>
>[snip]
>
>> > - I would also like to have my kernel detect a VGA card and run with
>> > it, or automatically revert
>> > to a serial console at 38400 bps if the VGA card is not detected.
>> > Can anyone help with that?
>>
>> Linux 2.2 does that for you. Look at the serial console documentation -
>> it's in there (disclaimer: I haven't tested it myself).
>
>I don't believe it automatically does this for you. (The documentation is
>a little vague.) You have to tell it to use the serial console. You can
>tell it to use both VGA and serial, and it will gracefully fail on
>whatever isn't present. I guess this is equivalent, except that if both
>are present it will use both.
>
>If you are worried about more than the kernel messages, some way that
>userspace can be told what the kernel is using as console, so it can run
>getty (or whatever) appropriately, would be a nice feature.
>
>According to the docs, there is some code that determines what device
>should be "official" /dev/console if multiple consoles are enabled. It
>first tries VGA, then serial. So it could be modified to set
>/proc/which_console, or some other way to tell userspace what happened.
>
>--Jeremy
>
>Jeremy Impson
>Network Engineer
>Advanced Technologies Department
>Lockheed Martin Federal Systems
>email: [EMAIL PROTECTED]
>phone: 607-751-5618
>fax: 607-751-6025
>
>
