linux-kernel - Re: [PATCH] Let AHCI dirver skip Lenovo SWRAID controller

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Message-ID: <20160125131850.64c5c22a@lxorguk.ukuu.org.uk>
Date:	Mon, 25 Jan 2016 13:18:50 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Ocean HY1 He <hehy1@...ovo.com>
Cc:	"tj@...nel.org" <tj@...nel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Let AHCI dirver skip Lenovo SWRAID controller

On Mon, 25 Jan 2016 03:11:40 +0000
Ocean HY1 He <hehy1@...ovo.com> wrote:

> Lenovo SWRAID solution is based on Intel Non-RSTE RAID controller which
> is called Lenovo SWRAID controller by set Lenovo dedicated PCI
> SVID:SDID.
> 
> Because AHCI driver now take control this Lenovo SWRAID controller for
> MDRAID, Lenovo SWRAID driver fails to load later. It's not proper to
> disable AHCI driver, because system has SATA contoller used for SATA
> DVD, M.2 etc. There is no chance to load Lenovo SWRAID first, because
> almost all Linux distros load AHCI driver first during installation.
> 
> As default, when Lenovo SWRAID controller is detected, let AHCI driver
> skip it thus MDRAID is disabled. Use the boot option 'ahci.lenovo_swraid=0'
> could disable Lenovo SWRAID.

You need to submit the Lenovo SWRAID driver to the kernel first.
Otherwise this breaks things.

Alan