>Is a DDR trainer really that hard to write?

Since this is an unencrypted binary, I'm sure it won't be difficult to reverse engineer. And it will definitely be open source sooner or later. But first, we'll try to convince Rockchip to open source it. Especially since the RK3576 has other proprietary parts, such as OP-TEE and some registers. Also it has a Cortex M0 core, which is also not documented.