Subject: serial console for dom0?
To: None <firstname.lastname@example.org>
From: Steven M. Bellovin <email@example.com>
Date: 12/29/2006 23:02:56
I'm trying to build a dom0 system (4.0beta2) with a serial console.
The standard XEN3-DOM0 doesn't include a com port; however, it
includes XEN2_DOM0, which defines ISA com ports. My machine is (and
should be) ACPI, which is supported by the XEN3-DOM0 config file.
Accordingly, I added
attimer* at acpi? # AT Timer
com* at acpi? # Serial communications
interface #fdc* at acpi? # Floppy disk
controller joy* at acpi? # Joystick/Game port
lpt* at acpi? # Parallel port
mpu* at acpi? # Roland MPU-401 MIDI UART
#npx* at acpi? # Math coprocessor
pckbc* at acpi? # PC keyboard controller
pcppi* at acpi? # AT-style speaker sound
wss* at acpi? # NeoMagic 256AV in wss mode
to my config file, plus
no com1 at isa?
no lpt0 at isa?
no pckbc0 at isa?
When I boot, though, I get this:
com0 at acpi0 (PNP0501-1)
com0: io 0x3f8-0x3ff irq 4
com0: com probe failed
com1 at acpi0 (PNP0501-2)
com1: io 0x2f8-0x2ff irq 3
com1: ns16550a, working fifo
I don't know why com0 is failing, unless perhaps it's because there's a
cable going to it. com1 is just a header on the motherboard. (I also
can't figure out how to configure the floppy, since including get gets
link-time errors about a missing interrupt routine, but since I doubt
I'll ever actually use a floppy on this machine I don't really care.)
--Steve Bellovin, http://www.cs.columbia.edu/~smb