From: David Gibson <david-xT8FGy+AXnRB3Ne2BGzF6laj5H9X9Tb+@public.gmane.org>
To: Benjamin Herrenschmidt
<benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
Cc: Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Grant Likely
<grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
devicetree-compiler-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Scott Wood <scottwood-KZfg59tc24xl57MIdRCFDg@public.gmane.org>,
Kim Phillips
<kim.phillips-KZfg59tc24xl57MIdRCFDg@public.gmane.org>,
Kumar Gala
<galak-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
Subject: Re: [PATCH] libfdt: add address translation support
Date: Wed, 14 May 2014 14:20:24 +1000 [thread overview]
Message-ID: <20140514042024.GE28789@voom> (raw)
In-Reply-To: <1399932065.17624.139.camel@pasglop>
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On Tue, May 13, 2014 at 08:01:05AM +1000, Benjamin Herrenschmidt wrote:
> On Mon, 2014-05-12 at 14:27 -0500, Rob Herring wrote:
> > But what you wrote was for unflattened tree. For early FDT uses, do we
> > really need to worry about PCI or other special cases? The current FDT
> > address translation code in arch/powerpc/boot/devtree.c (yes, now we
> > have 3 implementations) does not for example.
>
> This is specific to a bootloader case yes and it's ... fishy.
>
> PCI on ARM is here now. PCI is everywhere (well, pseudo-PCI but that's
> the basic issue here) on Intel embedded.
>
> Some embedded systems will probably want to enumerate from the firmware
> and Linux will need to translate. For example because the UART or some
> critical GPIO that needs to be handled early on is behind a pseudo-PCI
> interface of some sort.
>
> I think we need to handle these cases rather than fail in obscure ways.
Yeah, I think PCI is way to common to just ignore.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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next prev parent reply other threads:[~2014-05-14 4:20 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-01 16:57 [PATCH] libfdt: add address translation support Rob Herring
[not found] ` <1396371463-7516-1-git-send-email-robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-04-01 18:59 ` Warner Losh
[not found] ` <4073722A-7162-4041-B1A2-8A992871FEC0-uzTCJ5RojNnQT0dZR+AlfA@public.gmane.org>
2014-04-02 5:43 ` David Gibson
[not found] ` <20140402054325.GC3496-1s0os16eZneny3qCrzbmXA@public.gmane.org>
2014-04-02 14:53 ` Warner Losh
[not found] ` <AB306DF0-D50C-476A-8314-CFCE5C57BB2E-uzTCJ5RojNnQT0dZR+AlfA@public.gmane.org>
2014-04-02 23:37 ` David Gibson
2014-04-01 23:02 ` Scott Wood
[not found] ` <1396393358.32034.40.camel-88ow+0ZRuxG2UiBs7uKeOtHuzzzSOjJt@public.gmane.org>
2014-04-02 19:24 ` Kim Phillips
[not found] ` <20140402142403.9d3316f14520252a4a3474e0-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
2014-04-02 21:01 ` Rob Herring
2014-04-15 14:03 ` Rob Herring
[not found] ` <CAL_JsqKMUHiPeU7iQDHZ=E6GzMxvXBB4L8Arg+m0JrfQsRkhtg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-04-28 18:12 ` Rob Herring
2014-04-15 21:57 ` Grant Likely
[not found] ` <CACxGe6uPerPT_cT+p1zvL20ERwuguDJWDHasxz5gAUe5kPQHNg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-04-15 22:55 ` Rob Herring
2014-05-12 6:00 ` David Gibson
2014-05-12 6:10 ` Benjamin Herrenschmidt
2014-05-12 6:14 ` Benjamin Herrenschmidt
2014-05-14 4:19 ` David Gibson
2014-05-12 19:27 ` Rob Herring
[not found] ` <CAL_Jsq+zi72PAjQ+RGvUddLtHocgphPQQ9x2X0S0dYGOKz+Hgg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-12 22:01 ` Benjamin Herrenschmidt
2014-05-14 4:20 ` David Gibson [this message]
2014-05-14 4:18 ` David Gibson
2014-05-14 5:23 ` Benjamin Herrenschmidt
2014-05-14 6:51 ` David Gibson
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