[Buildroot] [PATCH 1/2] uboot and arm trusted firmware build added to juno board

[Thomas Petazzoni <thomas.petazzoni@free-electrons.com>]

Hello,

On Wed, 27 Apr 2016 15:17:34 +0100, Joao Pinto wrote:

> > That is still OK, we can always have a Buildroot package that
> > downloads that tarball, extracts it, takes the fip.bin, uses the
> > fip_create tool to extract the SCP firmware, install it somewhere, and
> > then have the atfirmware package pick it up to create the final fip.bin.
> 
> There's a detail. fip_create is built by the atfirmware package. So the package
> must be built once, extract the scp, copy somewhere, built it again now with the
> SCP_BL2. It is doable, but double build is needed and I don't know how buildroot
> deals with this 2xbuild operation.

Gaah. This is indeed going to be insane. Another option is to have:

 1/ Your atfirmware package as-is.
 2/ A package that just downloads/extracts the SCP firmware.
 3/ A post-image script that generates the final fip.bin.

That's probably the easiest solution for now. We can see at making that
better when/if we have more platforms that require a similar firmware.
My ARM64 platform does not: I simply need to build U-Boot and ATF, and
the image produced by ATF is directly usable.

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com