In recent years, highly integrated on-chip SOC has been widely used in product fields such as aerospace, automotive, and industry. The FMQL45 series processor is currently the only mass-produced programmable Soc system-on-chip launched by Fudan Microelectronics in China, it contains a quad core ARM Cortex-A7 hard core and FPGA resources of different capacities. With the development of Space technology, spacecraft functions are increasingly complex, and the reliability of embedded software is required to be higher. This article designs a software security startup architecture based on FMQL45 series processor, which enables the software to still start normally and respond to online upgrades again in the event of an unexpected power outage during the upgrade process.