Re: RT example

[Junior <ejr@inbox.com>]

With no response, perhaps someone can tell me what are the basic needs for a ARM platform to use the rt patches.
So far, the pactches hurt rather than help me and I've remove them. So, there must be something I don't know I'm missing.

Your help will be appreciated.
--Jr.


> -----Original Message-----
> From: ejr@inbox.com
> Sent: Sat, 27 Jan 2007 11:34:05 -0800
> To: ejr@inbox.com, r.schwebel@pengutronix.de
> Subject: Re: RT example
> 
> Hi All,
> Does anyone have any comments on my quesions below.
> I'm really looking for a good place to start and it would be a great help
> if someone could suggest one.
> 
> Or, someone could guide me in the right direction with a serial driver
> I'm working on. I'm trying to make the serial driver interrupt
> get serviced with 10-12ms when its fired. Do I use a timer or is there
> something in the rt patch that I can adjust in response to interrupts?
> 
> Thanks much.
> --Junior
> 
>> -----Original Message-----
>> From: ejr@inbox.com
>> Sent: Thu, 25 Jan 2007 07:11:30 -0800
>> To: r.schwebel@pengutronix.de
>> Subject: Re: RT example
>> 
>>> On Wed, Jan 24, 2007 at 10:58:41AM -0800, Junior wrote:
>>>> Does anyone have example code using the PREEMPT_RT patch?
>>> 
>>> You could for example start with cyclictest. It is also a good example
>>> for how to write cyclic realtime programs on Linux.
>> 
>> Thanks, I will start there.
>> 
>> Where do I get the rt library? (-lrt in makefile)?
>> 
>> cyclictest.c: In function `timerthread':
>> cyclictest.c:153: error: `SIGEV_THREAD_ID' undeclared (first use in this
>> function)
>> 
>> Someone got this before but no solution on how to fix it.
>> 
>> 
>>> Note that realtime is not about running fast, but running "in time".
>>> That may often mean that the overall system performance goes down.
>>> 
>>>> PS. I'm using an ARM9 platform
>>> 
>>> Do you have clocksource/clockevent support for your ARM9 chip?
>> 
>> Aparently I don't. It's set as IS_TICK_BASED. How does this affect the
>> system?
>> 
>> Thanks,
>> --Jr.