On 01/19/2011 04:14 PM, Yoder Stuart-B08248 wrote:
+** Optional properties:
+
+ - no-reset : The presence of this property indicates that the MPIC
+ should not be reset during runtime initialization.
+ - protected-sources : Specifies a list of interrupt sources that are
+ not
+ available for use and whose corresponding
+ vectors
+ should not be initialized. A typical use case
+ for
+ this property is in AMP systems where multiple
+ independent operating systems need to share
+ the MPIC
+ without clobbering each other.
Is "protected-sources" really needed for AMP systems to
tell the OSes not to clobber each other? Won't each
OS be given a device tree with only its interrupt
sources? ...so you know what you are allowed to touch.
This was discussed a little bit already [1, 2]. The MPIC driver
currently initializes the VECPRI register for all interrupt sources,
which can lead to the aforementioned clobbering.
--
Meador Inge | meador_inge AT mentor.com
Mentor Embedded | http://www.mentor.com/embedded-software
[1]
http://lists.ozlabs.org/pipermail/devicetree-discuss/2010-December/003850.html
[2]
http://lists.ozlabs.org/pipermail/devicetree-discuss/2011-January/003936.html
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