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Re: sti() freezes the kernel

To: Yoann Allain <yallain@avilinks.com>
Subject: Re: sti() freezes the kernel
From: Ralf Baechle <ralf@linux-mips.org>
Date: Mon, 17 Oct 2005 14:10:47 +0100
Cc: linux-mips@linux-mips.org
In-reply-to: <4353656E.8070601@avilinks.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <4353656E.8070601@avilinks.com>
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On Mon, Oct 17, 2005 at 10:48:46AM +0200, Yoann Allain wrote:

> I'm actually trying to start a 2.4 kernel on our new card.
> The kernel freezes when enabling interrupts with sti() in start_kernel() 
> (just before calculating BogoMips...).
> This looks like an interrupts is up when enabling so that it stops the 
> MIPS and freezes the kernel.
> I'm looking after this interrupt but I would like to know if there could 
> be any others reasons for my kernel to freeze when doing a call to sti();

This is a fairly scenario and as you suspect it's being caused by interrupt
problems, such as interrupts still pending from the firmware, being
not initialized at all or similar.

  Ralf

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