Boot option

overview

+--------+----------------+----------+-----------+
| Boot   | Terminology #1 | Actual   | Rockchip  |
| stage  |                | program  |  Loader   |
| number |                | name     |   Name    |
+--------+----------------+----------+-----------+
| 1      |  Primary       | ROM code | BootRom   |
|        |  Program       |          |           |
|        |  Loader        |          |           |
|        |                |          |           |
| 2      |  Secondary     | u-boot   | MiniLoader|
|        |  Program       | SPL      |           |
|        |  Loader (SPL)  |          |           |
|        |                |          |           |
| 3      |  -             | U-Boot   |  U-Boot   |
|        |                |          |           |
|        |                |          |           |
| 4      |  -             | kernel   |  kernel   |
|        |                |          |           |
| 5      |  -             | rootfs   |  rootfs   |
+--------+----------------+----------+-----------+