two ata write chaching request

[Garrett Cooper]

On Mon, Dec 20, 2010 at 3:29 PM, Chuck Swiger <cswiger at mac.com> wrote:
> On Dec 20, 2010, at 3:10 PM, Alexander Best wrote:
>> 1) write caching to be turned on and off for individual hdds
>>   (i.e. hw.ata.X.wc) and
>> 2) to be able to turn write chaching on and off on the fly.
>
> NetBSD's dkctl allows one to enable and disable read or write caches on a per-device basis, on the fly.  Presumably atacontrol or whatever the new ada / ACHI driver uses for control would be the FreeBSD equivalent....

    atacontrol doesn't work with ahci. Some changes to this code
should be coming soon, so I don't advise investing too much in hacking
the driver for this support (unless you talk to mav@ first)...
Thanks,
-Garrett