From: Paul Walmsley <paul@pwsan.com>
To: Gary Thomas <gary@mlbassoc.com>
Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>,
devicetree-discuss@lists.ozlabs.org,
linuxppc-dev@lists.ozlabs.org
Subject: Re: Virtual addresses in arch/powerpc/boot/dts/tqm8548*.dts ?
Date: Tue, 30 Aug 2011 19:55:48 -0600 (MDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1108301946391.26173@utopia.booyaka.com> (raw)
In-Reply-To: <4E5D668B.1060609@mlbassoc.com>
On Tue, 30 Aug 2011, Gary Thomas wrote:
> On 2011-08-30 15:43, Paul Walmsley wrote:
>
> > So are these addresses virtual? My (perhaps incorrect) understanding of
> > the device tree files was that they were intended to describe the physical
> > memory map, rather than the virtual memory map. Or does this PowerPC
> > variant have the ability to dynamically change its own physical address
> > decoding? Or is something else going on?
>
> These addresses correspond to the internal registers which can be moved.
> The default address is set by hardware at reset time (check out the
> documentation on the hardware reset word). Obviously one board is
> strapped for the IMMR at one address, another board at a different
> address. I almost always configure my boards to use 0xF0000000 for the
> IMMR.
Got it. Thanks Gary.
- Paul
prev parent reply other threads:[~2011-08-31 1:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-30 21:43 Virtual addresses in arch/powerpc/boot/dts/tqm8548*.dts ? Paul Walmsley
2011-08-30 22:39 ` Gary Thomas
2011-08-31 1:55 ` Paul Walmsley [this message]
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