Re: [Bisected] Latest git will not boot on MacBook

[Tejun Heo]

Harald Arnesen wrote:
> See attached photo of screen.
> git bisect gives this:
>
>
> 78ab88f04f44bed566d51dce0c7cbfeff6449a06 is first bad commit
> commit 78ab88f04f44bed566d51dce0c7cbfeff6449a06
> Author: Tejun Heo <htejun@xxxxxxxxx>
> Date:   Thu May 1 23:41:41 2008 +0900
>
>     libata: improve post-reset device ready test
>
>     Some controllers (jmb and inic162x) use 0x77 and 0x7f to indicate that
>     the device isn't ready yet.  It looks like they use 0xff if device
>     presence is detected but connection isn't established.  0x77 or 0x7f
>     after connection is established and use the value from signature FIS
>     after receiving it.
>
>     This patch implements ata_check_ready(), which takes TF status value
>     and determines whether the port is ready or not considering the above
>     and other conditions, and use it in @check_ready() functions.  This is
>     safe as both 0x77 and 0x7f aren't valid ready status value even though
>     they have BSY bit cleared.
>
>     This fixes hot plug detection failures which can be triggered with
>     certain drives if they aren't already spun up when the data connector
>     is hot plugged.
>
>     Tested on sil, sil24, ahci (jmb/ich), piix and inic162x combined with
>     eight drives from all major vendors.
>
>     Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
>     Signed-off-by: Jeff Garzik <jgarzik@xxxxxxxxxx>

The change was reverted and I'm trying to come up with a better version. 
 Thanks.

--
tejun
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