Context Switch Problem
S.Bitton at sstl.co.uk
Fri May 12 14:34:50 UTC 2006
I don't believe that's the problem though as the software actually breaks during context switch, i.e. I don't come out of the _Context_Switch, and as far as I can tell the enabling of the interrupts is not done by _Context_Switch but by _ISR_Enable which happens just after.
From: Joel Sherrill [mailto:joel.sherrill at oarcorp.com]
Sent: 12 May 2006 16:21
To: Chris Johns
Cc: Samuel Bitton; rtems-users at rtems.com
Subject: Re: Context Switch Problem
Chris Johns wrote:
> Samuel Bitton wrote:
>> I'm currently working on a new RTEMS BSP for a custom made board
>> based around the i386ex processor.
>> The software currently breaks towards the end of RTEMS
>> initialisation, at the point where it is doing the first context
>> switch (_Context_Switch called at the end of
>> My application only has one small init task which toggles a line
>> Any idea what could be going wrong.
>> I'm using RTEMS 4.6.4.
> Have you look over this page:
> It has some reasons a BSP can fail.
And the most likely reason is included there -- an interrupt is pending
and you are taking
an exception. The first context switch enables CPU interrupts and any
device not in a
quiescent state will slap you here. :)
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