Thanks for posting the update. Did you get the MCP2515 part working? I was able to build everything okay and in some cases was able to probe the device but setup failed after that. Was there anything else you modified in the device trees or the kernel config? Thanks! Yes, I've enabled SPI via UART4...

Yes with the above mentioned dtsi

So http://opensource.rock-chips.com/wiki_Boot_option describes two boot options: Rockchip-Miniloader and U-Boot TPL https://www.denx.de/wiki/pub/U-Boot/MiniSummitELCE2013/tpl-presentation.pdf A TPL (Tertiary Program Loader) is required due to SRAM/L2 cache limitations. It can barely init the DDR RAM...

Thanks for your reply. Let me rephrase my question: Rockchip is the manufacturer of the rk3399. As chip manufacturer they could only provide a bootloader until stage 1 (http://opensource.rock-chips.com/wiki_Boot_option). To help distributors they also provide a complete BSP including a full-fledged ...

What is the correct branch for SOM-RK3399 or NanoPC-T4? Rockchip recommends next-dev which I used. I see Rockchip does not provide the .bin files like in FriendlyARMS's tools/rk_tools/bin directory. Are they built as TPL/SPL on the fly? Also when the original u-boot from rockchip works with Friendly...

Why can't I use u-boot.img generated from https://github.com/rockchip-linux/u-boot on FriendlyARM-devices? When I flash original rockchip-MiniLoader I brick the SOM-RK3399 or NanoPC-T4 and need to recover with tweezers. More specifically: nanopi4-v2014.10_oreo from https://github.com/friendlyarm/ubo...

So this is the correct dtsi config in arch/arm64/boot/dts/rockchip/rk3399-nanopi4-common.dtsi / { model = "FriendlyElec boards based on Rockchip RK3399"; compatible = "friendlyelec,nanopi4", "rockchip,rk3399"; clocks { /* 8MHz external crystal oscillator */ clk8m: mcp25...

I think more info is needed. Hardware used: SOM-RK3399 with SOM-RK339 Dev-Kit. Wiring infos: |MCP2515 | SOM-RK3399 pin | dev_kit Connector | Signal name | |----------|------------------------|--------------------|----------------------------| |SCK | SPI1_CLK (62) | CON8 pin 7 | GPIO1_B1 | |SI | SPI1...

I've enabled SPI via UART4 with the help of this post There is a dst file for NVIDEA Tegra boards here However I have difficulties to enable the MPC2515 CAN controller via SPI, since I don't know how to bring up the correct DST config. Here is my config from arch/arm64/boot/dts/rockchip/rk3399-nanop...