Any objections/comments on axing out old ATA stack?

Peter Wemm peter at
Sun Mar 31 04:00:30 UTC 2013

On Sat, Mar 30, 2013 at 4:29 PM, Matthias Andree <mandree at> wrote:
> Am 27.03.2013 22:22, schrieb Alexander Motin:
>> Hi.
>> Since FreeBSD 9.0 we are successfully running on the new CAM-based ATA
>> stack, using only some controller drivers of old ata(4) by having
>> `options ATA_CAM` enabled in all kernels by default. I have a wish to
>> drop non-ATA_CAM ata(4) code, unused since that time from the head
>> branch to allow further ATA code cleanup.
>> Does any one here still uses legacy ATA stack (kernel explicitly built
>> without `options ATA_CAM`) for some reason, for example as workaround
>> for some regression? Does anybody have good ideas why we should not drop
>> it now?
> Alexander,
> The regression in
> where the SATA NCQ slots stall for some Samsung drives in the new stack,
> and consequently hang the computer for prolonged episodes where it is in
> the NCQ error handling, disallows removal of the old driver. (Last
> checked with 9.1-RELEASE at current patchlevel.)

We're talking about 10.x, so if you want it fixed, you need update
with 10.x information.

Please put 10.x diagnostics in the PR.

Peter Wemm - peter at; peter at; peter at; KI6FJV

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