[RFC PATCH V2 2/2] kbuild: dtbs_install: new make target

[Jason Cooper]

On Mon, Nov 18, 2013 at 12:23:48PM -0700, Stephen Warren wrote:
> On 11/18/2013 12:19 PM, Jason Cooper wrote:
> > On Mon, Nov 18, 2013 at 12:09:19PM -0700, Stephen Warren wrote:
> >> On 11/18/2013 11:38 AM, Jason Cooper wrote:
> >>> Unlike other build products in the Linux kernel, the devicetree blobs
> >>> are simply the name of their source file, s/dts/dtb/.  There is also no
> >>> 'make *install' mechanism to put them in a standard place with a
> >>> standard naming structure.
> >>>
> >>> Unfortunately, users have begun scripting pulling the needed dtbs from
> >>> within the kernel tree, thus hardcoding the dtbs names.  In turn, this
> >>> means any changes to the dts filenames breaks these scripts.
> >>>
> >>> This patch is an attempt to fix this problem.  Akin to 'make install',
> >>> this creates a new make target, dtbs_install.  The script that gets
> >>> called defers to a vendor or distribution supplied installdtbs binary,
> >>> if found in the system.  Otherwise, the default action is to install a
> >>> given dtb into
> ...
> >> This only appears to create ${compat}.dtb, and not ${dtb} too. 
> > 
> > See my comment, above.
> > 
> >> So, it doesn't seem to address part of the cover letter, "In addition,
> >> some vendors have done a diligent job naming their devicetree source
> >> files appropriately and we don't want to break their setups." Was that
> >> deliberate? If so, I guess I need to send some patches to U-Boot.
> > 
> > I assume you are still pulling from arch/arm/boot/dts/*.dtb, right?
> > Those build products don't go away with this patch, so you should be
> > fine.  Unless I'm mis-understanding your workflow...
> 
> Yes, but I thought the whole point of this was that everyone would/could
> switch to running "make dtbs_install", then pulling out the files from
> the install tree, instead of any use-case requiring obtaining files
> directly from the source/build tree?

Yes, in the script, it checks for the existence of /sbin/installdtbs.
If it's there, it will override the default behavior and execute that
script.

So yours can be:

#!/bin/sh

[ -d "/boot/dtbs/$1" ] && rm -rf "/boot/dtbs/$1"

mkdir -p "/boot/dtbs/$1"

for dtb in `find "$3" -name "*.dtb"`; do
	cp "$dtb" "/boot/dtbs/$1/${dtb##*/}"
done