linux-kernel - RE: 2.6.24.X: SATA/AHCI related boot delay.

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Message-ID: <15F501D1A78BD343BE8F4D8DB854566B26C12206@hkemmail01.nvidia.com>
Date:	Mon, 14 Apr 2008 16:11:34 +0800
From:	"Peer Chen" <pchen@...dia.com>
To:	"Volker Armin Hemmann" <volker.armin.hemmann@...clausthal.de>
Cc:	"Jeff Garzik" <jeff@...zik.org>, "Tejun Heo" <htejun@...il.com>,
	<linux-kernel@...r.kernel.org>, <linux-ide@...r.kernel.org>,
	"Kuan Luo" <kluo@...dia.com>
Subject: RE: 2.6.24.X: SATA/AHCI related boot delay. - not with 2.6.24.3

Volker,
I mean add msleep(x) function between writel(HOST_AHCI_EN, mmio + HOST_CTL) and readl(mmio + HOST_CTL) cause we ever met a bug that writing data to the AHCI BAR5 but need a delay to get correct read back value. But forget it, looks like it's not the same case here.
Which mode do you set(ahci or non-raid) when you encountered the issue that the AHCI_EN bit failed to set? I found we have workaround for AHCI_EN bit setting in our Bios programming guide for AHCI mode.

BRs
Peer Chen

-----Original Message-----
From: Volker Armin Hemmann [mailto:volker.armin.hemmann@...clausthal.de] 
Sent: Monday, April 14, 2008 2:42 PM
To: Peer Chen
Cc: Jeff Garzik; Tejun Heo; linux-kernel@...r.kernel.org; linux-ide@...r.kernel.org; Kuan Luo
Subject: Re: 2.6.24.X: SATA/AHCI related boot delay. - not with 2.6.24.3

On Montag, 14. April 2008, Peer Chen wrote:
> Volker,
> Could you add a delay between setting AHCI_EN and reading back function?
>

if you tell me how to?

Glück Auf
Volker

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