Bug#767744: flash-kernel: There is no way to specify a custom dtb

[Ian Campbell <ijc@hellion.org.uk>]

On Sun, 2014-11-02 at 12:08 +0100, Uwe Kleine-König wrote:
> Package: flash-kernel
> Version: 3.28
> Severity: wishlist
> 
> Hello,
> 
> I want to use flash-kernel on a machine that uses a device tree blob that isn't
> included in the kernel package. So flash-kernel's assumption to find
> /usr/lib/linux-image-$kvers/$dtb_id is wrong.
> 
> Maybe something like:
> 
> 	# if dtb_name starts with / assume it's a stand alone file. Otherwise
> 	# pick the one shipped by the linux image.
> 	if expr "$dtb_name" : "/" >/dev/null; then
> 		dtb="$dtb_name" 
> 	else
> 		dtb="/usr/lib/linux-image-$kvers/$dtb_name"
> 	fi
> 
> would work?

expr isn't a builtin, right? So we don't need to worry about dash vs
bash for it and whether the ":" operator is implemented.

Another possibility would be to search /etc/flash-kernel/dtbs (perhaps
with and without $kvers) before /usr/lib/blah.

I suppose you are needing to use flash-kernel's dtb appending mode,
otherwise you could just drop the file in /boot.

Ian.