RV1103B: Attempt to upstream

[Fabio Estevam]

Hi,

I have a custom board based on the Rockchip evb-rv1103 (RV1103B silicon),
booting from SPI-NAND.

I can successfully boot the vendor Rockchip U-Boot v2017.09 on this board,
from SPI-NAND

I am currently working on upstreaming U-Boot support for the RV1103B SoC.
My first RFC attempt is available here:

  https://github.com/fabioestevam/u-boot/commits/rv1103/

Build steps:

  make evb-rv1103_defconfig
  make

However, I am not yet able to boot U-Boot on the board. At the moment,
the board does not boot and only prints "RKUART".

My initial plan was to avoid SPL, similar to the evb-rv1108 approach
(described in board/rockchip/evb_rv1108/README).

Before going further, I would like to ask:

Is the evb-rv1108 “no SPL” boot flow a valid reference for RV1103B?

Any guidance or pointers would be greatly appreciated.

Thanks,

Fabio Estevam