Brain storm: how do I debug this?

[Aviv Greenberg]

The bt shows you are in cpu_idle but what is the full trace. If i had
to bet i would say that this is related to power management issue or
some another interrupt that the OS is waiting for that does not
arrive.

2011/3/19 Shachar Shemesh <shachar at shemesh.biz>:
> In 2009 I won a SheevaPlug as part of Hamakor Prize. At the time, I made
> sure it was actually working (it wasn't at first. The problem turned out to
> be that the MiniUSB cable that was bundled with the device was too short to
> make contact with the MiniUSB connector inside the device), and that I can
> connect to it, and that was it.
>
> A little while ago I picked it up again, and found out it wasn't booting. I
> managed to bootstrap uboot on it (which i compiled from the kirkwood git
> repository), and boot it into the bundled jffs2 Ubuntu 9.04 image that came
> with it, using a kernel I compiled from git (2.6.38-rc8, and later 2.6.38).
> So far, so good.
>
> Now I wanted to replace the image on it with Debian. I managed to
> debootstrap debian onto a disk on key, but when I try to boot it, it hangs
> during boot. I moved the image to a UBIFS image on the internal nand, but
> the problem persist. I can boot into single user mode, and everything works,
> but if I try to let the system boot completely, it just hangs.
>
> Symptoms:
>
> Pressing anything on the keyboard does not echo
> Magic sysrq key does not work (it does if I send the break before the hang)
> The boot sequence starts a couple of the init processes, and does not
> continue.
> The console is working. If I plug a disk on key, I see the console message
> about it, and it detects the partitions on it a second later.
>
> I tried to connect via jtag and get a backtrace - the system is in the
> cpu_idle routine - no panic and nothing out of the ordinary, except that it
> is not doing what it was supposed to be doing at this point.
>
> I tried to remove the last loaded service from the startup. The result is
> that it still loads two services and hangs (just, different services).
>
> Now I'm stuck for idea as to what to try next. Anyone?
>
> Shachar
>
> --
> Shachar Shemesh
> Lingnu Open Source Consulting Ltd.
> http://www.lingnu.com
>
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