[yocto] writeup on the mechanics of FILESEXTRAPATHS and bbappend files

[Robert P. J. Day]

  a while back, i dug into how FILESEXTRAPATHS worked with respect to
.bbappend files and i wrote it up, just updated it a bit here:

http://www.crashcourse.ca/wiki/index.php/FILESEXTRAPATHS_and_bbappend_files

do i have it about right? it seemed that the underlying details
weren't really explained well in any of the current yocto docs, and i
wanted something i could point students at.

rday

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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