linux-kernel - Re: [RFC PATCH 00/17] powerpc/e500: separate e500 from e500mc

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Message-ID: <20111110165455.GE11983@schlenkerla.am.freescale.net>
Date:	Thu, 10 Nov 2011 10:54:55 -0600
From:	Scott Wood <scottwood@...escale.com>
To:	Kumar Gala <galak@...nel.crashing.org>
CC:	"Moffett, Kyle D" <Kyle.D.Moffett@...ing.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Timur Tabi <B04825@...escale.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: Re: [RFC PATCH 00/17] powerpc/e500: separate e500 from e500mc

On Thu, Nov 10, 2011 at 10:30:41AM -0600, Kumar Gala wrote:
> On Nov 10, 2011, at 10:17 AM, Moffett, Kyle D wrote:
> > Furthermore, it looks like there are a couple issues here I missed
> > before.  PPC64 systems all appear to have an L1_CACHE_SHIFT of 7,
> > except when you turn on the P5020DS board option which magically
> > changes it to "6" and breaks lord-knows-what.  I think my patch
> > series actually "breaks" that and makes e5500 use 7 as well.
> 
> a value of '6' on E5500 / P5020DS is correct and doesn't break anything.  Setting it to 7 is wrong and thus the code is correct today.
> 
> > Are you sure that a kernel built to support E5500 can also run on
> > other 64-bit PowerPC/POWER systems?
> 
> No it will not.  There is not expectation of that as E5500 is an
> embedded / Book-E class part and uses that ISA version.  Book-S
> (server) 64-bit machines are not OS compatible and we are not trying to
> make them as such (but we do re-use a lot of code).

What about other 64-bit book3e chips?  What cache block size does A2 have?

-Scott

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