I think this rant from Linus explains it all ;)
http://article.gmane.org/gmane.linux.ports.arm.omap/55060
On 13-10-05 11:07 PM, Amalinda J' Gamage wrote:
I am a new user to beaglebone and I have a couple of basic questions.
I want to know what is meant by DT or Device tree overlay and why it
is required for BB/ ARM335X. Is it not required for other main
processors like Intel because they are " defined" in the Linux
kernel? and TI ARM3358 processor is not " defined" . What support is
available for other "popular" processors and is not available for TI
ARM 3358 in Linux Kernal? Or was there support BEFORE and was it taken
BACK?
I mean is this the reason that we make a device tree and pass it to
the system ? I may have mentioned incorrect statements please feel
free to correct me.
secondly, I know that with no Device tree stuff, it is possible to
lighten up an LED connected to the BB and BBB using the terminal. So
if the definitions are not there in the Linux kernel, how come this
method works? I mean how can one export a GPIO and lighten the LED
connected if that is not found in the kernel? If so, then is a DT
necessary at all?
A confused.
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