Host tool for KDP over serial
Host tool for KDP over serial
- Subject: Host tool for KDP over serial
- From: David Elliott <email@hidden>
- Date: Wed, 10 Jun 2009 00:46:13 -0400
Hi,
I'd like to run KDP over RS232 serial on an i386 target. Examination
of source in osfmk/kdp indicates that the kernel expects to see
ethernet frames coming in over RS232 preceded with 0xFA and ending
with 0xFB with occasional escaping using 0xFE to indicate an escape,
two's complement of the escaped bytes, and 0xFB to end the escape.
I have succeeded in hand crafting an ARP packet of this format and
when I send it down the wire I appear to get the appropriate response
from the kernel.
So now I am wondering if Apple has provided or can provide a tool
similar to the one for Firewire debugging that listens on UDP 41139
and shuttles the data over a /dev/tty device and back.
If not, writing one would be reasonably easy but I figured I'd ask
before embarking on that. Source is preferable as I'd prefer to run
it on a Linux machine with a hardware serial port as the PL2303-based
USB I have on the host side seems to have strange issues with the
driver from sourceforge.
Also, there's an interesting "bug" of sorts in the code. The IP of
the KDP will actually be different depending on whether it's big or
little endian. The target's IP is set to 0xABADBABE so on little
endian targets the IP is 190.186.173.171 but on big endian targets it
would presumably be 171.173.186.190. A bad babe indeed.
-Dave
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