Date: Sun, 28 Dec 1997 13:04:14 +1100 From: Bruce Evans <bde@zeta.org.au> To: grog@lemis.com, skynyrd@opus.cts.cwu.edu Cc: bde@zeta.org.au, freebsd-current@FreeBSD.ORG Subject: Re: Remote gdb (was: no boot: config -g and options DDB) Message-ID: <199712280204.NAA01965@godzilla.zeta.org.au>
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>On the subject of remote debugging: the handbook entry is missing some
>other important information. I still haven't been able to get the
>link to work. After considerable digging in the sources, I found that
>3. At some point, on the debugged machine, I re-enter the debugger.
> It hangs after the message
>
> Debugger("manual escape to debugger")
>
> and (presumably) waits for communication from the debugging
> machine.
>
>4. On the debugging machine, I enter
>
> target remote /dev/cuaa0
>
> I get the messages:
>
> Remote debugging using /dev/cuaa0
> Ignoring packet error, continuing...
> Ignoring packet error, continuing...
> Couldn't establish connection to remote target
> Malformed response to offset query, timeout
Possibly a speed mismatch. 16550s may be required on the debugged machine.
It may work better to do step 3) before 4).
>So what gives? Do I have my serial config wrong? I've done
>everything according to the book, and there is no indication, neither
>in the documentation nor in the sources, about how to set up the bit
>rate, character size and such. I assume somebody has got this to
>work, but I can't work out how.
Speed setting is fully doc^H^H^Hcoded in the sources. It may work better
to use a serial console or boot with -D. The speed will then be set by
the boot blocks, and the kernel will use the same speed (if it agrees
with the boot blocks about the port), and the h/w speed will be initialized
(-current neglects to initialize when the speed registers wouldn't change,
but this may leave the h/w behind the registers uninitialized after reset).
Bruce
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