There is no support to initialize DRAM on rk3308 SoC using U-Boot TPL or SPL, and therefore an external TPL binary must be used to package a bootable u-boot-rockchip.bin image.

Default ROCKCHIP_EXTERNAL_TPL to yes if ROCKCHIP_RK3308. Remove useless TPL_SERIAL. Doc add ROCK Pi S in the list of supported boards. Doc add info about usage of TF-A and TPL binaries provided by Rockchip. Doc add build steps for rk3308.

Changes in v2: - Replace imply with default yes if ROCKCHIP_RK3308 - Redirect outdated README.rockchip to rockchip.rst for rk3308 info - Improve rockchip.rst document about usage of TF-A and TPL binaries

Massimo Pegorer (2): rockchip: Kconfig: Enable external TPL binary for rk3308 doc: rockchip: Update and improve info on rk3308, TPL and TF-A

arch/arm/mach-rockchip/Kconfig | 3 +-- doc/README.rockchip | 10 +------- doc/board/rockchip/rockchip.rst | 43 +++++++++++++++++++++++++++------ 3 files changed, 37 insertions(+), 19 deletions(-)