On Sun, 2010-03-21 at 20:41 -0400, Brian Hutchinson wrote: > Hi, > > I've never needed to really get into the startup scripts much but now > I need to try and understand how the mini_fo union gets set up so I'm > trying to learn the startup scripts like preinit. > > I'm using a Pronghorn SBC (ixp-42xx) and I thought that maybe if I > edited preinit and put #!/bin/sh -x that I could turn on debugging and > see what the scripts were doing via the serial console. > > That didn't work so well. How you all debug startup scripts?
It depends on the error. If the problem is that preinit doesn't start
at all, that usually indicates a syntax error or some such in the start
up scripts, so on the host, I fire up dash, and do something like:
for script in *; do
. $script
done
in the build_dir/target.../root.../lib/preinit directory
If there is a syntax error it will emit an error message and it can be
fixed.
Errors that prevent successful sourcing of files will cause preinit to
die.
>
> I can't change preinit from the target can I? I tried but I guess it
I was going to suggest using a 'pure' jffs image, but I realized that
defeats the purpose of what you are trying to test. For a squashfs, the
preinit runs from squashfs, not jffs (because mounting the jffs is part
of the preinit functionality; probably the most important).
> isn't using the one from /jffs and is using the one from /rom. I had
> to rebuild the image to get my preinit changes to execute on startup.
>
Stefan had good suggestions for the rest.
--
And that's my crabbing done for the day. Got it out of the way early,
now I have the rest of the afternoon to sniff fragrant tea-roses or
strangle cute bunnies or something. -- Michael Devore
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