"ARM" s5pv210 chip start-up process

The idea of the designer of the s5pv210 chip

(1) After the chip starts to execute Irom (BL0) content, carries on the initialization of the clock and the watchdog and so on peripheral, will copy BL1 and BL2 to the on-chip SRAM;

(2) Jump to the on-chip SRAM execution, complete the initialization of the external SDRAM, and copy the OS from the storage device to the SDRAM;

(3) Jump into the SRAM to execute the OS start code.

Due to the size of the u-boot, cannot be copied to the on-chip SRAM, so U-boot's designers designed the process

(1) After the chip starts to execute Irom (BL0) content, carries on the initialization of the clock and the watchdog and other peripherals, copies the BL1 to the on-chip SRAM;

(2) Jump to the on-chip SRAM for execution, complete the initialization of the SDRAM, copy the BL2 into the SDRAM, execute.

(3) Jump to the BL2 in the SDRAM to execute, copy the OS into the SDRAM, jump to the beginning of the OS to execute the OS.

"ARM" s5pv210 chip start-up process