[OpenWrt Wiki] Image formats
openwrt.org › docs › techrefThe initramfs-kernel image is used for development or special situations as a one-time boot as a stepping stone toward installing the regular sysupgrade version. Since the initramfs version runs entirely from RAM, it does not store any settings in flash, so it is not suitable for operational use. initramfs-uImage.bin: initramfs-kernel.bin:
[OpenWrt Wiki] AVM FRITZ!Box 7530
https://openwrt.org/toh/avm/avm_fritz_box_753020.04.2020 · Copy the OpenWrt initramfs (!) image to a installed TFTP server root directory on our Computer and rename it to FRITZ7530.bin. The Box will now put the file (a pull request every 5 seconds) and boot OpenWrt into RAM. This can take up to two minutes. Copy the U-Boot and the OpenWrt sysupgrade (!) image to the Box using scp, like
[OpenWrt Wiki] Image formats
https://openwrt.org/docs/techref/image.formatinitramfs Can be loaded from an arbitrary location ( most often tftp ) and is self-contained in memory. This is like a Linux LiveCD. Often used to test firmware, as the first part of a multi-stage installation or as a recovery tool. 3) An initramfs and initrd are basically the same. It’s a filesystem in memory, which contains userland software.