arm: xea: Add support for reading SoM (CPU) board HW revision
The XEA board now has several HW revisions for SoM boards.
This patch provides support for reading this revision ID values in early
u-boot proper as production devices boot via falcon boot with correct DTB
flashed at production (so there is no need to alter SPL).
Additionally, the maximal SPL size (~55KiB) constraint is not allowing
having even simplified FIT support in it.
As a result it was necessary to handle reading GPIOs values solely in
u-boot proper as one configuration (i.e. 'single binary' -
imx28_xea_sb_defconfig) is not using SPL framework.
Moreover, the 'board_som_rev' environment variable will be used to point
correct configuration from the Linux FIT file.
Additionally, as now XEA has its second HW revision - this information is
printed when u-boot proper starts.
Signed-off-by: Lukasz Majewski <lukma@denx.de>
4 files changed