linux-kernel - Re: [PATCH] SATA: OCTEON: support SATA on OCTEON platform

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Message-ID: <20150122215543.GA5048@fuloong-minipc.musicnaut.iki.fi>
Date:	Thu, 22 Jan 2015 23:55:43 +0200
From:	Aaro Koskinen <aaro.koskinen@....fi>
To:	David Daney <ddaney@...iumnetworks.com>
Cc:	Mark Rutland <mark.rutland@....com>,
	David Daney <ddaney.cavm@...il.com>,
	Aleksey Makarov <aleksey.makarov@...iga.com>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Daney <david.daney@...ium.com>,
	Anton Vorontsov <avorontsov@...mvista.com>,
	Vinita Gupta <vgupta@...iumnetworks.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Ralf Baechle <ralf@...ux-mips.org>, Tejun Heo <tj@...nel.org>,
	Hans de Goede <hdegoede@...hat.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH] SATA: OCTEON: support SATA on OCTEON platform

Hi,

On Wed, Jan 21, 2015 at 09:17:31AM -0800, David Daney wrote:
> On 01/21/2015 08:54 AM, Mark Rutland wrote:
> >While the DTB may already exist, the string "cavium,octeon-7130-ahci"
> >isn't in mainline, and as far as I can see has never been supported.
> 
> There seems to be a disconnect here.  The DTB comes from the hardware boot
> environment.  The hardware is in some cases already deployed.  It is for all
> practical purposes, impossible to change the DTB.

It's possible to change/fix the DTB in platform code like currently
done for the OCTEON in-tree DTBs. But that's ugly.

I think there should be also a mechanism to override the DTB completely
with a user supplied one like with kernel APPENDED_DTB on ARM.

A.
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