Allwinner A20 - System Boot Diagram

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 96 / 812
1.6.2. System Boot Diagram
Power
up
The state of
BSP pin is
‘0’?
SDC0(PF port)
boot operation
SDC0 Boot
Success?
NAND Flash boot
operation (CE0)
NFC Boot
Success?
SDC2(PC port)
boot operation
SDC2 Boot
Success?
USB boot
operation
boot OK, run other
firmware
Yes
No
Yes
Yes
Yes
No
No
No
SPI0(PC port)
boot operation
SPI Nor Flash
Boot Success?
Yes
No