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Date:      Sun, 27 Nov 2011 23:23:56 +0000
From:      "b. f." <bf1783@googlemail.com>
To:        Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Cc:        Thomas Mueller <mueller6727@bellsouth.net>, mav@freebsd.org, freebsd-questions@freebsd.org
Subject:   Re: "options atapicam" and/or "device ATA_CAM" in kernel config?
Message-ID:  <CAGFTUwM8s+RUxfbfadD53nDB=zWrjywMp_YunGNqgg6h+C6tAw@mail.gmail.com>
In-Reply-To: <44ehwt5r9g.fsf@lowell-desk.lan>
References:  <CAGFTUwM=f03PMVvL45-Ov965EqN-Lea_RtW1ksX94vbefn+Ypg@mail.gmail.com> <44ehwt5r9g.fsf@lowell-desk.lan>

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On 11/27/11, Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> wrote:
> "b. f." <bf1783@googlemail.com> writes:
>
>>> > > What is the role of "options atapicam" and "device ATA_CAM" in kernel
>>> > > config file?
>>>
>>> > > Are they redundant?  Kernel will build with both these options, but
>>> > > will it make things go awry?  Is ATA_CAM deprecated?
>>
>> They are redundant and incompatible.  atapicam is deprecated, and
>> ATA_CAM is the new default on FreeBSD 9 and 10. Unless you have some
>> special requirements, you should use ATA_CAM on recent versions of
>> FreeBSD, because it usually performs better than the old ATA code, and
>> has added functionality.
>
> Ah. My apologies to anyone I confused with my incorrect comments.
>
> I must say that I'm thoroughly disappointed that my searches through the
> official documentation didn't turn up anything related to this. Even the
> Handbook, with extensive practical descriptions of how to use this
> functionality, doesn't mention that its advice is irrelevant to anything
> past 8.x.

The handbook does contain some oblique and scattered references to the
new code, or at least to constructs that are common to both the old
and the new code, but the addition of a brief discussion of the
differences between the new and old ATA code in the handbook -- i.e.,
the kernel and userland components that are now obsolete, and their
replacements -- might be of some help to users.  The primary author of
the new code did add some material to various notes and manpages, but
he has been very busy writing and debugging code, and English is not
his first language, so others will have to supplement his efforts.
Perhaps you could ask for some additions on the freebsd-doc mailing
list?

b.



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