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Re: How to enter ddb on recent NetBSD/amd64 current
prlw1%cam.ac.uk@localhost (Patrick Welche) writes:
>uc> diskable pckbc
> pckbc0 disabled
>but no change:
>wsdisplay0 at vga0 kbdmux 1: console (80x25, vt100 emulation)
>wsmux1: connecting to wsdisplay0
>ukbd0 at uhidev0: 8 modifier keys, 6 key codes
>wskbd0 at ukbd0 mux 1
>wskbd0: connecting to wsdisplay0
>So can lack of "console" be the reason I can't break into ddb?
Sure. Only the console keyboard checks for magic input.
When wskbd is attached from a console keyboard, you see the "console keyboard"
message. The first USB keyboard should be the 'console keyboard' unless
pckbc_cnattach finds a PC keyboard.
The problem is, pckbc finds a PC keyboard even when you disable the driver
because it just maps the hardware (and that a long time before autoconfig
would attach the driver) and sends a simple enable command. Sending
the command doesn't require any complex response from the hardware
and it doesn't require a working keyboard.
There is a kernel option PCKBC_CNATTACH_SELFTEST which sends a selftest
command to the PC keyboard and waits for a successful response. Maybe
this helps in your case to really skip the PC keyboard for the console.
The alternative is of course to remove pckbd from the kernel configuration.
Michael van Elst
"A potential Snark may lurk in every tree."
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