Re: serial console puzzle

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

On Fri, Apr 30, 2021 at 05:04:34PM +0200, Manuel Bouyer wrote:
> On Fri, Apr 30, 2021 at 03:44:46PM +0100, Patrick Welche wrote:
> > In /boot.cfg:
> > 
> > menu=Boot normally:rndseed /var/db/entropy-file;consdev com0,57600;boot
> > 
> > # installboot -ve /dev/rsd0a
> > File system:         /dev/rsd0a
> > Boot options:        timeout 5, flags 0, speed 57600, ioaddr 0, console com0
> > 
> > Yet in dmesg:
> > 
> > com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, 1-byte FIFO
> > com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, 1-byte FIFO
> > com1: console
> > 
> > (so I don't actually see anything)
> > 
> > (Wednesday's -current/amd64)
> > 
> > 
> > Thoughts?
> 
> one possibility is that the bios has com0 and com1 swapped.
> In some case I had to explicitely set ioaddr with installboot to have
> the serial console working.

I should have said: according to the BIOS "COM A" is 0x3f8, and "COM B"
is 0x2f8, so they are the right way around.

(Of course UEFI is fine, and I get console output, but...)


Cheers,

Patrick