ttps://wiki.radxa.com/Rockpi4/dev/u-boot/pxe


env default -a
saveenv
reset

setenv bootargs root=/dev/nfs nfsroot=${serverip}:/miniroot rootwait rootfstype=ext4 nic=auto:eth0:dhcp
tftp ${fdt_addr} kernels/armv8/dtb/broadcom/bcm2837-rpi-3-b.dtb
booti ${kernel_addr_r} ${ramdisk_addr_r}:${filesize} ${fdt_addr}
tftp ${kernel_addr_r} kernels/armv8/Image-armv8
tftp ${ramdisk_addr_r} isolinux/initrd-armv8.img