linux-kernel - Re: sata AHCI controller over non-PCI bus

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Message-ID: <4A88014D.9060309@garzik.org>
Date:	Sun, 16 Aug 2009 08:53:33 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	"Subbrathnam, Swaminathan" <swami.iyer@...com>
CC:	Sergei Shtylyov <sshtylyov@...mvista.com>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: sata AHCI controller over non-PCI bus

Subbrathnam, Swaminathan wrote:
> Jeff,
> 	From the below link (from Sergei) it seems that you have already re-factored the AHCI implementation dependency on PCI.  I would like to add support for the OMAPL138 SATA on top of your changes.  That would be the ideal way forward for me.
> 
> 	Have the ahci re-factoring changes queued for mainline merge already?  I just joined the list and hence do not know the status.
> 
> Sergei,
> 	Appreciate the response.

I store the refactoring in git, on the "libahci" branch of
git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev.git

Unfortunately, I am having second thoughts about an element of the 
current design.  With current Linux distributions, they do not appear to 
deal well with the multi-module dependency libata -> libahci -> ahci. 
If I had to guess, I would say that mkinitrd creation tools only look at 
one tree level's worth of kernel module dependencies.

Thus, ahci would wind up -not- in initrd, in a libahci solution.

I am thinking that I will just add Marvell and ATP support to ahci.c, 
and let someone else deal with libahci separation -- which is still needed.

At this point, I would rather get Marvell/ATP support into users' hands, 
rather than wait for distros to catch up to modern technology.

	Jeff

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