linux-kernel - Re: 2.6.28: Is there a way to disable sata probing for certain ports?

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Message-ID: <9b2b86520812301108k525ca193gac0307b630bdbbd1@mail.gmail.com>
Date:	Tue, 30 Dec 2008 19:08:28 +0000
From:	"Alan Jenkins" <alan-jenkins@...fmail.co.uk>
To:	"Grant Grundler" <grundler@...gle.com>
Cc:	"Justin Piszcz" <jpiszcz@...idpixels.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: 2.6.28: Is there a way to disable sata probing for certain ports?

On Tue, Dec 30, 2008 at 5:08 PM, Grant Grundler <grundler@...gle.com> wrote:
> On Tue, Dec 30, 2008 at 4:24 AM, Justin Piszcz <jpiszcz@...idpixels.com> wrote:
>> When I boot from an Intel X25-E SSD, it takes roughly a few seconds;
>> however, items such as:
>>
>> $ dmesg|grep link\ down
>> [    2.447030] ata4: SATA link down (SStatus 0 SControl 300)
>> [    4.481288] ata5: SATA link down (SStatus 0 SControl 0)
>> [    6.501288] ata6: SATA link down (SStatus 0 SControl 0)
>> [    8.522038] ata7: SATA link down (SStatus 0 SControl 0)
>> [   10.552288] ata8: SATA link down (SStatus 0 SControl 0)
>>
>> Scanning for devices on channels that have nothing connected adds to the
>> boot time, is there anyway to turn off/disable scanning for certain ports to
>> help speed the boot process?
>
> Some BIOSs allow one to enable/disable each port individually.
> Have you checked the BIOS config menus for such an option?
>
> drivers/ata/libata-core.c declares "ata_force_param_buf" but I don't
> see any documentation for it despite the reference to
> Documentation/kernel-parameters.txt .

There is.  Search the file for "libata.force".  But it doesn't support
disabling the scan for specific ports; that has yet to be implemented.

<https://kerneltrap.org/mailarchive/linux-kernel/2008/8/11/2900064/thread>

Alan
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