From: Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
To: Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: David Gibson
<david-xT8FGy+AXnRB3Ne2BGzF6laj5H9X9Tb+@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: Tue, 13 May 2014 08:01:05 +1000 [thread overview]
Message-ID: <1399932065.17624.139.camel@pasglop> (raw)
In-Reply-To: <CAL_Jsq+zi72PAjQ+RGvUddLtHocgphPQQ9x2X0S0dYGOKz+Hgg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
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.
Cheers,
Ben.
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next prev parent reply other threads:[~2014-05-12 22:01 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 [this message]
2014-05-14 4:20 ` David Gibson
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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