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Document how to drop into DDB from a serial console.

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This commit is contained in:
Jordan K. Hubbard 1996-04-13 11:57:18 +00:00
parent 5e814ff6c2
commit 39cef8f8cb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=15236
1 changed files with 10 additions and 1 deletions
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11
sys/i386/boot/biosboot/README.serial
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@ -69,6 +69,15 @@ To boot FreeBSD in serial console mode, you must do the following:
in order to connect the terminal to the PC's serial port. If you don't
have one, go to Radio Shack and buy one: they're cheap.
NOTE #3:
If you wish to drop into the kernel debugger from the serial console
(useful for remote diagnostics, but also dangerous if you generate a
spurious BREAK on the serial port!) then you should compile your kernel
with the following options:
options BREAK_TO_DEBUGGER
options DDB
- BOOT THE MACHINE. The boot block will probe for a keyboard on your
system. If it fails to find one, you'll see a prompt appear on the
terminal that looks something like this:
@ -152,4 +161,4 @@ CAVEATS:
from the new kernel.
$Id: README.serial,v 1.3 1995/04/20 23:15:07 joerg Exp $
$Id: README.serial,v 1.4 1996/04/07 14:27:58 bde Exp $