Context Switch Problem
S.Bitton at sstl.co.uk
Fri May 12 15:32:50 UTC 2006
Note that I'm relying mostly on the default RTEMS configuration.
My application (which is a simple single init task that toggles a line indefinitely) only defines the following before including confdefs.h
#define CONFIGURE_MAXIMUM_TASKS 2
Is there anything I'm missing in the RTEMS config or should that be ok in which case my current guess would be a bad memory mapping from my side.
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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