看了一个u-boot里的源码
"sdboot=if mmcinfo; then " \
"run uenvboot; " \
"echo Copying Linux from SD to RAM... && " \
"fatload mmc 0 0x3000000 ${kernel_image} && " \
"fatload mmc 0 0x2A00000 ${devicetree_image} && " \
"fatload mmc 0 0x2000000 ${ramdisk_image} && " \
"bootm 0x3000000 0x2000000 0x2A00000; " \
"fi\0" \
最后这个 fi 是什么
求大神解答...