Nanopc-t2 uboot Start-up process Analysis-1 power-on Start

This paper analyzes the main NANOPC-T2 platform. NANOPC-T2 is using Samsung's s5p4418 as the main CPU.

When the system is power-up, the s5p4418 maps the Internal ROM code on the 0x3400_0000 to 0x0000_0000 for execution. The code copies data from 0x0000_0200 on the SD card into internal RAM, with a target location of 0xffff_0000 and a data size of 16KB. When the copy is complete, the instruction jumps to 0xffff_0200 and the code initializes some of the CPU's devices, including clocks, DRAM, and so on, and then copies the data (Uboot) from the 64th sector on the SD card to the DRAM with the destination address 0x42c0_0000. After the copy is complete, jump to 0x42c0_0000 to continue execution. The power-on start is complete at this time.