| Subject: [x86] single-stepping in DDB eventually causes machine to reboot?

ddb doesn't deal with 16-bit code very well, so when you step through
into the bios, you lose.

Are you trying this with -current since 2000/05/11 05:54:49? Therein
I committed code to work around a problem with pnpbios rebooting
Sony VAIOs.

Can you build your kernel with PNPBIOSDEBUG and PNPBIOSVERBOSE, boot
with a serial console, and offer the output?

Alternatively, for debugging, I'd suggest breakpointing on pnpbioscall()
and cont-ing after each break and seeing which call is the one
causing the reboot.

--jhawk