You create this file in your custom layer.
You also name it accordingly based on the linux-yocto recipe
you are using.
For example, if you are modifying the
meta/recipes-kernel/linux/linux-yocto_3.4.bb
recipe, the append file will typical be located as follows
within your custom layer:
<your-layer>/recipes-kernel/linux/linux-yocto_3.4.bbappend
The append file should initially contain the following text:
FILESEXTRAPATHS := "${THISDIR}/${PN}"
The path ${
THISDIR
}/${
PN
}
expands to "linux-yocto" in the current directory for this
example.
If you add any new files that modify the kernel recipe and you
have extended FILESPATH
as
described above, you must place the files in your layer in the
following area:
<your-layer>/recipes-kernel/linux/linux-yocto/