(beginner) Kernel fail during local_irq_enable()

[Siva Prasad]

Hi, 

Some thing similar happened for me before. After I set the IRQ enable
bits, it resulted in an exception. After analyzing the exception and
SRR1 bits set, I was able to take care of it.

Other reason can be...
Immediately after you enable interrupts, any interrupt (which are
already enabled) can cause the system to take a different path of
servicing those interrupts. If some thing happens in that service
routine, you are in for a surprise.

If you have a JTAG emulator, after system hangs, just halt it and see
where it is executing. That may give a clue of what might have happened.
Or, you can look at the stack, based on the register contents, to see
the call back (difficult, but possible).

Good Luck.

- Siva


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Date: Tue, 13 Nov 2007 12:04:59 +0100
From: fabien <fabien.fb at gmail.com>
Subject: (beginner) Kernel fail during local_irq_enable()
To: linuxppc-embedded at ozlabs.org

I work on a custom board based on MPC8xx.

The bootloader on it is a ppcboot 1.1.5. I'm a beginner with Linux port

and ppc.
 I'm trying to pass the board working with a 2.4.4 kernel to a 2.6.19
kernel

from denx.
 The kernel hang when trying to enable interrupt in local_irq_enable()

in init/main.c.
 Nothing happened after. Look at the printk log dumped from __log_buf
adresse with md ppcboot command.