Dear Gianfranco,
in message <020c01c25820$89c23880$0700a8c0@pc005> you wrote:
I'm currently working on a custom board derived from EST8260. We are trying
to implement a device driver of MCC to control the interface with a
synchrounous PCM.
I have noted that when there is an interrupt on SCC1 (or FCCx) the latency
time of MCC interrupt increase. Now I'm really concerned about the
possibility to loose some frame due to an heavy use of such interfaces.
If losing a frame is _that_ critical to you yoy should consider using
RTAI.
Do anybody knows if there is the possibility to avoid such behaviour (maybe
allowing an interrupt casting with the MCC ISR)?
With RTAI you can register the MCC as a real-time interrupt which has
higher priority than all Linux stuff, guaranteed.
See http://www.rtai.org/ , and feel free to contact me when you need
help.
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de
The software required `Windows 95 or better', so I installed Linux.
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
Many thanks for your suggestion, I have checked the references You gave me
and I believe that RTAI would be a good solution to solve our problem.
Actually I'm working with a quite old version of HardHat package (CDK 1.2
with 2.4.0-test2 kernel) with some minor patches in order to have the
ethernet 100% functionality, do You think we can easily port the RTAI on
this version or shall we migrate to HardHat 2.0?
Gianfranco
----- Original Message -----
From: "Wolfgang Denk" <redacted>
To: "Ing.Gianfranco Morandi" <redacted>
Cc: "LinuxPPC" <redacted>
Sent: Monday, September 09, 2002 9:36 PM
Subject: Re: 8260 MCC Interrupt priority
Dear Gianfranco,
in message <020c01c25820$89c23880$0700a8c0@pc005> you wrote:
quoted
I'm currently working on a custom board derived from EST8260. We are
trying
quoted
to implement a device driver of MCC to control the interface with a
synchrounous PCM.
I have noted that when there is an interrupt on SCC1 (or FCCx) the
latency
quoted
time of MCC interrupt increase. Now I'm really concerned about the
possibility to loose some frame due to an heavy use of such interfaces.
If losing a frame is _that_ critical to you yoy should consider using
RTAI.
quoted
Do anybody knows if there is the possibility to avoid such behaviour
(maybe
quoted
allowing an interrupt casting with the MCC ISR)?
With RTAI you can register the MCC as a real-time interrupt which has
higher priority than all Linux stuff, guaranteed.
See http://www.rtai.org/ , and feel free to contact me when you need
help.
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de
The software required `Windows 95 or better', so I installed Linux.
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/