From: Scott Wood <scottwood@freescale.com>
To: Kevin Hao <haokexin@gmail.com>
Cc: linuxppc <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH 1/2] powerpc: enable the relocatable support for the fsl booke 32bit kernel
Date: Thu, 27 Jun 2013 20:52:20 -0500 [thread overview]
Message-ID: <1372384340.8183.62@snotra> (raw)
In-Reply-To: <20130628013637.GA3173@pek-khao-d1.corp.ad.wrs.com> (from haokexin@gmail.com on Thu Jun 27 20:36:37 2013)
On 06/27/2013 08:36:37 PM, Kevin Hao wrote:
> On Thu, Jun 27, 2013 at 02:58:34PM -0500, Scott Wood wrote:
> > On 06/26/2013 09:00:33 PM, Kevin Hao wrote:
> > >This is based on the codes in the head_44x.S. Since we always =20
> align to
> > >256M before mapping the PAGE_OFFSET for a relocatable kernel, we =20
> also
> > >change the init tlb map to 256M size.
> >
> > Why 256M?
>=20
> For two reasons:
> 1. This is the size which both e500v1 and e500v2 support.
> 2. Since we always use the PAGE_OFFSET as 0xc0000000, the 256M is
> max alignment value we can use for this virtual address.
0xc0000000 is 1G-aligned, so I don't see why 256M is the maximum (after =20
verifying that enough memory is present with the right alignment, of =20
course). The TLB1 savings would probably not be enough to justify =20
figuring that out, though.
-Scott=
next prev parent reply other threads:[~2013-06-28 1:52 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-27 2:00 [PATCH 0/2] powerpc: enable the relocatable support for fsl booke 32bit kernel Kevin Hao
2013-06-27 2:00 ` [PATCH 1/2] powerpc: enable the relocatable support for the " Kevin Hao
2013-06-27 19:58 ` Scott Wood
2013-06-28 1:36 ` Kevin Hao
2013-06-28 1:47 ` Scott Wood
2013-06-30 7:33 ` Kevin Hao
2013-07-02 0:30 ` Scott Wood
2013-07-02 3:24 ` Kevin Hao
2013-07-02 22:39 ` Scott Wood
2013-07-03 3:00 ` Kevin Hao
2013-07-03 20:38 ` Scott Wood
2013-07-04 1:08 ` Kevin Hao
2013-07-08 16:48 ` Scott Wood
2013-07-09 1:26 ` Kevin Hao
2013-06-28 1:52 ` Scott Wood [this message]
2013-06-30 7:34 ` Kevin Hao
2013-06-27 2:00 ` [PATCH 2/2] powerpc/fsl_booke: enable the relocatable for the kdump kernel Kevin Hao
2013-06-28 2:19 ` Scott Wood
2013-06-30 7:35 ` Kevin Hao
2013-07-02 1:00 ` Scott Wood
2013-07-02 3:45 ` Kevin Hao
2013-07-02 22:41 ` Scott Wood
2013-07-03 3:29 ` Kevin Hao
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