>Number:         13100
>Category:       port-mac68k
>Synopsis:       NetBSD kernel drops to debugger on PB 160 w/ serial echo enabled.
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    port-mac68k-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jun 03 15:36:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Lars Kellogg-Stedman
>Release:        NetBSD-1.5
>Organization:
>Environment:
NetBSD  1.5V NetBSD 1.5V (GENERIC) #49: Sun May 27 00:08:04 PDT 2001     root2@c610:/usr/cvs/src/sys/arch/mac68k/compile/GENERIC mac68k

>Description:
If the "serial boot echo" option is enabled in the MacOS booter *without* enabling a serial console (e.g., using the built-in screen and keyboard), the kernel drops into the debugger at the following point in the boot sequence:

  nubus0 at mainbus0
  fpu0 at mainbus0 (emulator)
  Stopped in pid 0 (swapper) at _cpu_Debugger+0x6 unlk a6
  db>

At this point, keyboard input is inoperative so the only alternative is to power down the system.

On a successful boot, the next step (after detecting the (lack of) fpu) is detecting the ADB subsystem.

With "serial boot echo" disabled, everything works fine.

>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: