Question 1, what is the difference between the following four?
1. Cache: QorIQ SDK V1.9 PPCE500V2 CACHE
2. Image: QorIQ SDK V1.9 PPCE500V2 IMAGE
3. Source: QorIQ SDK V1.9 SOURCE
4. Virtual Host Enviroment: QorIQ DPAA SDK v1.9 PPCE500V2 with Virtual Host Enviroment
Question 2, I just want to use it to compile the uboot of the P2020 processor. It is as convenient as possible to build a development and compilation platform. Which one do you recommend?