From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Gregory Dymarek <gregd72002@gmail.com>, Xenomai <xenomai@xenomai.org>
Subject: Re: [Xenomai] RaspberryPi kernel 3.8 issue
Date: Sun, 02 Mar 2014 20:04:26 +0100 [thread overview]
Message-ID: <531380BA.70006@xenomai.org> (raw)
In-Reply-To: <53137F18.3020409@xenomai.org>
On 03/02/2014 07:57 PM, Gilles Chanteperdrix wrote:
> On 03/02/2014 07:54 PM, Gregory Dymarek wrote:
>> This works!!
>>
>> I thought xenomai does not deal with fiq. Why is it required to enable them
>> in the driver when having xenomai on?
>
> Because without CONFIG_IPIPE local_irq_restore deals with FIQs
> With CONFIG_IPIPE local_irq_restore does not deal with FIQs
>
> We can of course rework local_irq_restore to take into account FIQs with
> CONFIG_IPIPE, but that would make local_irq_restore heavier in a lot of
> places, whereas there are in fact only three spots to fix, for only one SOC.
>
>
BTW, using FIQs for USB means that USB activity will be able to
influence xenomai latencies. So, it is really not recommended, if there
is a configuration option for disabling the use of FIQ with this driver,
this should be recommended for use with xenomai.
--
Gilles.
next prev parent reply other threads:[~2014-03-02 19:04 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-23 21:27 [Xenomai] RaspberryPi kernel 3.8 issue Gregory Dymarek
2014-02-23 21:37 ` Gilles Chanteperdrix
2014-02-23 22:18 ` Gregory Dymarek
2014-02-23 22:36 ` Gilles Chanteperdrix
2014-02-23 22:37 ` Adam Vaughan
2014-02-23 23:08 ` Adam Vaughan
2014-02-23 23:30 ` Gregory Dymarek
2014-02-23 23:32 ` Gregory Dymarek
2014-02-23 23:42 ` Gilles Chanteperdrix
2014-02-24 21:19 ` Gregory Dymarek
2014-02-24 22:00 ` Gilles Chanteperdrix
2014-02-25 20:04 ` Gregory Dymarek
2014-02-25 20:20 ` Gilles Chanteperdrix
2014-02-25 20:23 ` Gregory Dymarek
[not found] ` <CAEbDrgkJCnbWu_J4svoXOU1x2rz=n95A5+3Ee=R_9CpMgx-JmA@mail.gmail.com>
2014-02-25 20:25 ` Gilles Chanteperdrix
2014-02-25 20:43 ` Gregory Dymarek
2014-02-25 20:50 ` Gilles Chanteperdrix
2014-02-25 21:09 ` Gregory Dymarek
2014-02-25 21:24 ` Gilles Chanteperdrix
2014-02-25 21:28 ` Gilles Chanteperdrix
2014-02-25 21:31 ` Gilles Chanteperdrix
2014-02-25 22:30 ` Adam Vaughan
2014-02-25 23:20 ` Gregory Dymarek
2014-02-25 23:42 ` Adam Vaughan
2014-02-25 23:45 ` Adam Vaughan
2014-02-26 0:12 ` Gregory Dymarek
2014-02-26 0:22 ` Adam Vaughan
2014-02-26 0:33 ` Gilles Chanteperdrix
2014-02-26 10:00 ` Gregory Dymarek
2014-02-26 18:48 ` Adam Vaughan
2014-02-26 21:46 ` Gilles Chanteperdrix
2014-02-26 10:26 ` Paul
2014-02-25 23:51 ` Gilles Chanteperdrix
[not found] ` <CAEbDrgkWZqSxjCUfjR3YCp=YOzh1r-=YC6Wyr-Jvk9d7JYEcmQ@mail.gmail.com>
[not found] ` <530E6159.4050204@xenomai.org>
2014-02-26 22:37 ` Gregory Dymarek
2014-02-27 10:48 ` Gilles Chanteperdrix
2014-02-27 18:43 ` Gregory Dymarek
2014-02-27 20:14 ` Gilles Chanteperdrix
2014-02-27 20:33 ` Gregory Dymarek
2014-02-27 20:48 ` Gilles Chanteperdrix
2014-02-27 20:58 ` Gilles Chanteperdrix
2014-02-27 21:15 ` Gilles Chanteperdrix
2014-02-27 22:54 ` Gregory Dymarek
2014-02-28 1:12 ` Paul
2014-02-28 11:42 ` Gilles Chanteperdrix
2014-02-28 11:41 ` Gilles Chanteperdrix
2014-03-01 12:27 ` Gregory Dymarek
2014-03-02 15:11 ` Gilles Chanteperdrix
2014-03-02 17:26 ` Gregory Dymarek
2014-03-02 18:05 ` Gilles Chanteperdrix
2014-03-02 18:16 ` Gilles Chanteperdrix
[not found] ` <CAEbDrg=2nX1kKOGt6i7b-w5AsLXkEyoJCGUMw1dkMXvka4MeKw@mail.gmail.com>
2014-03-02 18:55 ` Gregory Dymarek
2014-03-02 18:57 ` Gilles Chanteperdrix
2014-03-02 19:04 ` Gilles Chanteperdrix [this message]
2014-03-02 19:08 ` Gregory Dymarek
2014-03-02 21:03 ` Gregory Dymarek
2014-02-24 0:22 ` Paul
2014-02-24 0:47 ` Adam Vaughan
2014-02-24 0:53 ` Adam Vaughan
2014-02-24 1:20 ` Adam Vaughan
2014-02-26 19:59 Gregory Dymarek
2014-02-26 20:29 ` Gregory Dymarek
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