Re: [RFC][PATCH] bcmai: introduce AI driver

[Arend van Spriel]

On Sat, 09 Apr 2011 09:10:26 +0200, George Kashperko <george@xxxxxxxxxxx>  
wrote:

> > On Fri, 08 Apr 2011 18:56:13 +0200, RafaÅ MiÅecki <zajec5@xxxxxxxxx>  
> > wrote:
> >
> > > 2011/4/6 Arend van Spriel <arend@xxxxxxxxxxxx>:
> > >> 3. Device identification
> > >>
> > >> The cores are identified by manufacturer, core id and revision in  
> > your
> > >> patch. I would not use the revision because 4 out of 5 times a  
> > revision
> > >> change does indicate a hardware change but no change in programming
> > >> interface. The enumeration data does contain a more selective field
> > >> indicating the core class (4 bits following the core identifier). I
> > >> suggest
> > >> to replace the revision field by this class field.
> > >
> > > Could you say something more about *class*, please? For my BCM43224 it
> > > seems to be 0x0. WIll check BCM4313 in a moment.
> > >
> >
> > In principal the manufacturer id is unique (defined/assigned by JEDEC
> > www.jedec.org) and the chip id and chip class are defined by the
> > manufacturer. So I can only indicate what classes Broadcom uses in
> > combination with the manufacturer id BRCM, ARM and MIPS.
> >
> > /* Component Classes */
> > #define	CC_SIM			0
> > #define	CC_EROM			1
> > #define	CC_CORESIGHT		9
> > #define	CC_VERIF		0xb
> > #define	CC_OPTIMO		0xd
> > #define	CC_GEN			0xe
> > #define	CC_PRIMECELL		0xf
> >
> > Looking at this it seems strange that you see a class value of 0x0. It  
> > may
> > be rarely used or for non-production chips only (for simulation, chip
> > bringup) which may require additional (debug) functions. So question is
> > whether you will need it, but it is specified by ARM and it is up to
> > manufacturers to use it. So I it is better to be safe than sorry and  
> > have
> > this in the device id.
> >
> > Gr. AvS
> When parsing bcm4716 EROM I have
> cia & CIA_CCL_MASK equal to 0 for all 9 cores
>
> You mentioned ARM DMP (Device Management Plugin) several times in
> earlier messages some time ago but I can't find anything relevant about
> that at ARM infocenter. Any chance you can point more precise location
> for any DMP reference?

I believe this is part of the CoreLink AMBA Designer tool, which is used  
to design/configure a SoC. The DMP is ARM system IP and so references are  
under ARM copyright. You need a special account with ARM to get access to  
these references.

Gr. AvS
--
"The world is indeed comic, but the joke is on mankind." â H.P. Lovecraft

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