请问各位大侠，u-boot启动信息中有"boot from FEL"或”boot from MMC1",象下面2段u-boot启动信息：
U-Boot SPL 2018.01-05679-g013ca457fd (Apr 29 2022 - 07:58:42)
DRAM: 32 MiB
Trying to boot from FEL
U-Boot SPL 2018.01-05679-g013ca457fd (Apr 29 2022 - 07:58:42)
DRAM: 32 MiB
Trying to boot from MMC1
Card did not respond to voltage select!
mmc_init: -95, time 22
spl: mmc init failed with error: -95
Trying to boot from sunxi SPI
请问，什么情况下会出现“boot from FEL”的启动信息呢？谢谢
离线
弄明白了。
将uboot下载到ram,单次运行，即使用如下命令：sunxi-fel uboot ./u-boot-sunxi-with-spl.bin，会出现“boot from FEL”的启动信息。
将uboot写入spiflash,再运行，即使用如下命令：sunxi-fel -p spiflash-write 0 ./u-boot-sunxi-with-spl.bin，会出现上面的另一段启动信息。
离线