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On 12/2/2012 10:22 PM, Michael Haberler wrote:
> I have several starting points and 'just' need to determine which
> one works well. 'Just' should be read as 'a kernel build for such
> platforms should be started before you go to sleep, and check in 
> the morning'.

Note that you can easily cross-compile kernels...building Linux
natively on these ARM boards is painful, and on many systems capable
of running Linux it's just plain impossible (at least without massive
upgrades to available memory/disk).

I haven't experimented with cross-compiling LinuxCNC.  That's more
mountain than I want to climb right now.  :)

<snip>

> As for the Raspberry: that has very limited potential - the
> platform is about half as fast as the Beaglebone, has fairly
> minimal GPIO, and it is wed to the Broadcom chipset, which I would
> rate as a company which still doesnt get it. A mean voice said
> about the chipset used on the Pi 'half of it isnt documented, and
> the other half doesnt work'. Thats not entirely true but there is
> something to that comment.

Even worse, the Pi isn't an ARM chip with a bunch of stuff attached,
it's a black-box video decoder/GPU that happens to have an ARM as a
co-processor.  The GPU is in total control of the system (including
booting from flash), everything about the GPU is undocumented, and the
GPU can eat up as much bus/memory/system as it wants, holding off even
a real-time Linux kernel for unknowable amounts of time.

I agree with you that Broadcom doesn't get it, and TI does.

- -- 
Charles Steinkuehler
[email protected]
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