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SubjectRe: Fw: 2.6.24.X: SATA/AHCI related boot delay. - not with

Tejun, Alan,

Everything works when I disable the USB in the bios settings. I was also able to remove the irqpoll kernel parameter after turning off bios USB. The particularly interesting thing is that the USB mouse still works, as does a USB 2.0 drive I have connected. The Compact Flash drive at /dev/sda works fine, and the connected SATA drive works as well, though I need to do some testing to see how well these devices are performing.

Using the irqpoll also made things work except for once. In that case, I got the same errors, delayed bootup, and missing SATA drive.

Is there a new "hdparm like" tool for working with the new drives/drivers to be able to read/set parameters, run various tests, etc?

This motherboard is an IBT MB899 mini-ITX.

Thanks for the guidance with this!

C. W. Wright

----- Original Message ----
> From: Tejun Heo <>
> To:
> Cc:; IDE/ATA development list <>
> Sent: Friday, March 21, 2008 5:56:10 AM
> Subject: Re: Fw: 2.6.24.X: SATA/AHCI related boot delay. - not with
> Hello,
> wrote:
> > setting irqpoll fixed both problems, and there are no "nasty grams"
> > in dmesg now. The original reason I was trying to use the hdparm -u
> > on /dev/sda was because it was hanging for a few seconds when doing
> > writes to the CFdisk, and in the past that was the kind of thing that
> > hdparm -u would generally fix.
> libata drivers don't need or support hdparm -u settings.
> > Now with the irqpoll kernel option,
> > the /dev/sdb SATA drive was found, and I can mount it and write to
> > it. The CFcard /dev/sda is also responding to writes better than
> > before.
> >
> > Thanks for the suggestion to use irqpoll. What is the problem
> > within the driver(s) that is requiring irqpoll. ?
> Well, IRQ 18 is taken offline during USB initialization. The IRQ is
> shared with the SATA controller, so SATA controller doesn't work either.
> It isn't clear why the IRQ handler is taken offline. It could be the
> USB controller but can also be the SATA controller. Does not loading
> usb driver make any difference?
> --
> tejun
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