start development for Rockchip

[orangecms]

With sunxi (Allwinner), we have introduced support for SoCs / boards from well-known vendors who's chips are used in many devices, such as Orange Pi, PinePhone, TV boxes, etc.. The kickstart happened via the xfel tool from the xboot project.

For Rockchip, we can start in a similar fashion, using rkflashtool and/or xrock.

[hanetzer]

one annoyance: you need to process the bootblob in a
certain manner. coreboot has a python script that does this.
And last I looked u-root's kexec tool can't load dtb files?

[orangecms]

Good to know, I'll have a look at that script and also check U-Boot.

Loading a dtb shouldn't be an issue, we could add that if necessary. :-)

[hanetzer]

for the record: I own both a rk3288 and rk3399 based chromebook, with the servo debug headers installed,
along with a servo debug board, so I have a lot of debug capabilities in this area.

[orangecms]

Excellent! I have a ROCK64 that I wanted to use for initial development.
However, I need to figure out how the USB modes work, can you help with that @hanetzer?

rkflashtool is said to not support mask ROM mode fully, only bootloader mode: https://wiki.radxa.com/Rock/flash_the_image#Linux
However, as per this help text, it can load DDR init and USB loader from mask ROM mode: http://rockchip.wikidot.com/rkflashtool

Do you have experience with that?

[hanetzer]

not a clue about rkflashtool, sorry to say. and what do you mean by 'usb modes'?
rk3288/rk3399 have both coreboot and u-boot firmware implementations, so there's
a lot of info we can crib from them.

[jwinarske]

This is a good working reference for RK3399:
https://gitlab.com/DeltaGem/levinboot

I'm interested in getting Oreboot running on Pine phone Pro - RK3399, as well as other targets. I've been studying levinboot.

[felixsinger]

https://gitlab.com/pine64-org/quartz-bsp/rkdeveloptool