On Tue, 13 Jan 2009, Brad Boyer wrote:
On Tue, Jan 13, 2009 at 09:49:59PM +0000, flameman mayer wrote:
...
i'm working with kernel-2.6.27 and i have this issue
macserial kernel panic
unable to handle kernel NULL pointer de reference at virtual address
000004 modules linked in: m68k_handle_int+0x1c/0x36
call trace mac_scc_dispatch+0x3a/0x40 auto_irqhandler_fixup+0x4/0x6
also, i hacked the "emile-0.12" sources to build a monitor able to
serially talk: it works for both the 2 LC475 serial lines :P
is there anything about serial support for linux-m68k ?
The real driver for the serial ports on m68k Macintosh systems got
removed from the tree a long time ago and has not been replaced as of
this time. However, we still register mac_scc_dispatch as an interrupt
handler for the line that the SCC uses. This looks like you got an
interrupt for the serial chip and the interrupt code got confused trying
to dispatch to nothing. I've never seen it happen, but it does look like
that would be the expected behavior of the current code.
I've seen it happen. You should avoid sending anything to the mac serial
port. But you can still capture kernel messages from the mac serial port
without triggering the panic.
It's on my list to fix, but I honestly haven't had much time to work on
it. My plan is to either share or copy pmac_zilog.c which is the driver
for the serial on PowerMacs rather than start from the Atari driver as
mentioned in the web page above. It's not only the same chip but
attached to the system in mostly the same way.
It's on my list, too. But above it are frame buffer, Nubus, SCSI and PMU
issues.
Finn
Brad Boyer
flar@xxxxxxxxxxxxx
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