Details: https://home.eeworld.com.cn/home.php?mod=space&uid=148817&do=blog&quickforward=1&id=240051 ARM uses IO to simulate SPI bus to burn FPGA configuration chip EPCS4 to complete software upgrade. Test steps on TQ2440: 1. Connect an EPCS4 that has been burned with FPGA program by downloader to ARM. ARM reads the \"all sectors\" data of EPCS4 and saves it to NandFlash, and then copies it to the computer for backup. 2. Connect another FPGA to be burned to ARM and burn the data just read into it.
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