Re: [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry

From: Russell King - ARM Linux
Date: Fri Nov 27 2015 - 14:52:07 EST


On Fri, Nov 27, 2015 at 01:27:23PM +0000, Russell King - ARM Linux wrote:
> It is possible to redirect any program to open any other file. You can
> do it via a LD preload, and intercepting the open(), and possibly the
> read() calls if you want to do something more fancy. The down-side is
> that you have to arrange for the preloaded object to be used by the
> linker, and the additional overhead it places on the intercepted
> functions.

Another idea if people don't like the preload idea.

We could create a zero-sized /proc/atags, and then use a bind mount in
userspace to bind some other file containing the required information
on top. That could even be the atag blob from /sys/firmware/whatever.
The N700 (or whatever platform needs it) could be responsible for
creating the zero-sized /proc/atags so that we don't have it everywhere.

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