Re: [Avid-L2] Mac 64 Bit Kernal or 32 Bit Kernal Impact?

Mac Pro 2,1 Octo-core released in 2007, also has 32 bit EFI. Cannot run
Mountain Lion without turning your genuine Mac into a Hackintosh with
Chameleon.

In OSX Snow Leopard and Lion, 64 bit apps will run as genuine 64 bit,
addressing all memory even if you boot with the 32 bit kernel. This is
different than Windows. MacOSX itself can run in 32 bit mode, but the apps
can still run 64 bit. You can check this in Activity Monitor. 64 bit apps
will show that they are indeed running in 64 bit mode. Mountain Lion has
no 32 bit kernel and is therefore not supported on the Mac Pro 1,1 and 2,1.


Last updates of Snow Leopard, all builds of Lion and Mountain Lion boot the
64 bit kernel by default if the hardware supports it. Early builds of Snow
Leopard and earlier OS versions may need to turn on 64 bit booting in the
terminal or supplied Avid utility.

Kernel Extension (aka drivers) must support 64 bit if you boot the 64 bit
kernel. If not, they won't load. Same goes for 32 bit kernel support. If
there is no support for 32 bit mode, it won't load when booting the 32 bit
kernel (Lion and earlier). This affected Avid DX hardware. The kernel
extension for DX hardware that came with Avid v6 did not support the 32 bit
kernel, therefore would not load if you booted the 32 bit kernel, even
though MC 6 would run just fine as a 64 bit app. You can run Avid MC 6 on
the Mac Pro 1,1 and 2,1, even though the machine boots the 32 bit kernel.
You can't run DX hardware, but third party cards like AJA and BMD work
just fine because their drivers are written for both the 32 and 64 bit
kernels.




On Friday, July 12, 2013, Dom Q. Silverio wrote:

> **
>
>
> No matter if you boot with 64 or 32 bit kernel, OS X, for the most part,
> will allow a 64 bit application to address 64 bit of memory.
>
> Booting in 64 bit kernel requires drivers to be compatible in 64 bit.
> MacPro 1,1 (1st Gen) cannot boot in 64 bit kernel as the EFI is 32 bit
> only (EFI is similar to BIOS in PC world).
>
> On 7/12/2013 6:51 PM, johnrobmoore wrote:
> > I remember that being an issue early on. I don't know if it was
> resolved. My MBP Pro circa 2009 summer shows that the 64 bit kernel and
> extensions are Yes and I haven't had any issues that I know of but I have a
> software license on the box. I'm trying to figure out if the mac will know
> to run 64 bit software as 64 bit if the 64 bit kernel and extensions is not
> Yes. I was under the impression that the mac os would mix and match the
> 32bit software and 64 bit software and act accordingly but I may have
> misunderstood this behavior.
> >
> > --- In Avid-L2@yahoogroups.com <javascript:_e({}, 'cvml',
> 'Avid-L2%40yahoogroups.com');>, Robert Lawson <avidrhl@...> wrote:
> >> Wasn't it that booting into the 64-bit kernel wouldn't allow the
> software
> >> to see the dongle?
> >>
> >>
> >>
> >> ---
> >> Rob Lawson
> >> System Administrator, ACSR ISIS, Windows & Interplay
> >> CBS News
> >>
> >>
> >> On Fri, Jul 12, 2013 at 1:42 PM, John Moore <bigfish@...> wrote:
> >>
> >>> **
> >>>
> >>>
> >>> I've tried to refresh my mind on booting in 64 or 32 bit kernal on
> Macs.
> >>> I seem to recall that there was some mode where the mac new what apps
> are
> >>> 64 bit and those that are 32 and would act accordingly but I don't
> remember
> >>> the specifics or if that even makes sense. I read how some kernal
> >>> extensions aren't 64 bit compatible but I'm really sketchy. Can someone
> >>> help me understand?
> >>>
> >>>
> >>> John Moore
> >>> Barking Trout Productions
> >>> Studio City, CA
> >>> bigfish@...
> >>>
> >>> [Non-text portions of this message have been removed]
> >>>
> >>>
> >>>
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >
> >
> >
> > ------------------------------------
> >
> > Search the official Complete Avid-L archives at:
> http://archives.bengrosser.com/avid/
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
>


[Non-text portions of this message have been removed]



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