FSBL的全称是First Stage Boot Loader,他是启动ZYNQ的第一步,官方对于它的解释是:The FSBL configures the FPGA with HW bit stream (if it exists) and loads the Operating System (OS) Image or Standalone (SA) Image or 2nd Stage Boot Loader image from the non-volatile memory (NAND/NOR/QSPI) to RAM (DDR) and starts executing it. It supports multiple partitions, and each partition can be a code image or a bit stream.