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

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Date:	Mon, 14 Apr 2008 12:02:01 +0800
From:	"Peer Chen" <pchen@...dia.com>
To:	"Jeff Garzik" <jeff@...zik.org>, "Tejun Heo" <htejun@...il.com>
Cc:	"Volker Armin Hemmann" <volker.armin.hemmann@...clausthal.de>,
	<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,
Could you add a delay between setting AHCI_EN and reading back function?

BRs
Peer Chen

-----Original Message-----
From: Jeff Garzik [mailto:jeff@...zik.org] 
Sent: Saturday, April 12, 2008 9:43 AM
To: Tejun Heo
Cc: Volker Armin Hemmann; linux-kernel@...r.kernel.org;
linux-ide@...r.kernel.org; Peer Chen; Kuan Luo
Subject: Re: 2.6.24.X: SATA/AHCI related boot delay. - not with 2.6.24.3

Tejun Heo wrote:
> Volker Armin Hemmann wrote:
>> Hi,
>>
>>> Aiee.... Can you please try 2.6.25-rc8 with both configurations?
And
>>> w/o systemrescuecd?  Just seeing whether things mount properly or
not is
>>> good enough.  There isn't much risk of losing data.
>>
>> 2.6.25-rc8 is a 'no change'. AHCI+pci=nomsi boots, AHCI without
hangs.
>> with AHCI I also get this:
>>
>> [    0.363828] ------------[ cut here ]------------
>> [    0.363828] WARNING: at drivers/ata/ahci.c:645 
>> ahci_init_one+0x190/0xa3a()
>> [    0.363828] Modules linked in:
>> [    0.363828] Pid: 1, comm: swapper Not tainted 2.6.25-rc8 #2
> 
> Heh.. that's AHCI_EN not getting set.  Peer, any ideas?  The driver
set 
> AHCI_EN in the HOST_CTL register but on reading back it's still clear.

Possibly the hardware is not idle?  I wonder if the BIOS is doing 
anything with the IDE interface.  _Probably_ not, but that is certainly 
a situation where switching to AHCI can be a problem for certain AHCI
chips.

	Jeff



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