All platform specific configuration is moved out into separate files so
that the main makefile only contains common code. Choose which files to
include based on the values of u-boot configuration variables. Currently
these four U-Boot variables are used:
   CONFIG_SYS_VENDOR ==> include scripts/vendor-$(CONFIG_SYS_VENDOR).mk
   CONFIG_SYS_SOC ==> include scripts/soc-$(CONFIG_SYS_SOC).mk
   CONFIG_SYS_BOARD ==> include scripts/board-$(CONFIG_SYS_BOARD).mk
   CONFIG_SYS_CONFIG_NAME ==> include scripts/config-$(CONFIG_SYS_CONFIG_NAME).mk

Signed-off-by: Grant Likely <grant.likely@arm.com>

This patch adopts the Linux & U-boot kbuild style top level Makefile
that includes the generated config so that decisions can be made from
the specific config. The core of this change is to pull in the %config
parsing rules for u-boot/Makefile and process them separately from the
main build rules. This allows *config rules to change the U-Boot
configuration, and the import the CONFIG_* values into make so that
TFA_PLAT and other variables can be automatically determined.

Signed-off-by: Grant Likely <grant.likely@arm.com>

The primary repo for TF-A is on git.trustedfirmware.org. Use that
instead of the github mirror.

Signed-off-by: Grant Likely <grant.likely@arm.com>

Instead of setting the build directory unconditionally (which doesn't
entirely work anyway; U-Boot handles it well, but TFA and DT-rebasing do
not), by default let each project use it's own working directory.
However, if BUILD_BASE is set, then use that to create build directories
for the projects that support it.

Signed-off-by: Grant Likely <grant.likely@arm.com>

$MAKE is automatically set. Don't need to set it explicitly.

Signed-off-by: Grant Likely <grant.likely@arm.com>

Small changes:
- Make tfa-fip the default target
- Don't give U-Boot a replacement DTB
- Add some .PHONY targets

Signed-off-by: Grant Likely <grant.likely@arm.com>

Move the clean target into the top level makefile so that the .config
rule doesn't get called before doing the clean step

Signed-off-by: Grant Likely <grant.likely@arm.com>

There are some options in U-Boot that need to be enabled for EFI
testing. Add them to the defconfig.

Signed-off-by: Grant Likely <grant.likely@arm.com>

Set up a recursive structure so that u-boot defconfig can be run first
and then included in the 2nd stage makefile.

Signed-off-by: Grant Likely <grant.likely@arm.com>

U-Boot defconfig already knows a lot about the platform. Use the
defconfig data to know what the SoC is and start with sane defaults.

This currently works by running the U-Boot defconfig step with a
:=$(shell) statement before executing any make rules. It is a little
ugly to do it this way, and it may be better to recursively call Make
so that the output of make <target>_defconfig is executed in a proper
rule.
Signed-off-by: Grant Likely <grant.likely@arm.com>

The CACHEDIR target was a leftover from an experiment that didn't make
sense. Remove it. Also, add the buildall script to the base directory.

Signed-off-by: Grant Likely <grant.likely@arm.com>

This tool is all about building U-Boot images; so make the TARGET
variable match the name used in the U-Boot config directory.

Signed-off-by: Grant Likely <grant.likely@arm.com>

Fixes previous commits that renamed the manifest and scripts working
directory and changed to using the u-boot target name when choosing
which firmware image to build.

Signed-off-by: Grant Likely <grant.likely@arm.com>

Signed-off-by: Grant Likely <grant.likely@arm.com>

Splitting the individual platforms into separate makefiles simplifies
the build scripts considerably. The Makefile now includes a
platform-specific makefile based on the value of ${TARGET}, and the
included file can override the variables as needed for the
configuration.

Signed-off-by: Grant Likely <grant.likely@arm.com>