[OpenWrt Wiki] Image formats
openwrt.org › docs › techrefuImage. This is an image format designed for U-Boot loader, generally consisting of a kernel with a header for information. Often a zImage with a 64 byte uImage header, which contains the load address & entry point of the zImage, so that uBoot knows what to do with it.
[OpenWrt Wiki] OpenWrt on VirtualBox HowTo
openwrt.org › docs › guide-userJul 23, 2021 · combined-ext4.img.gz This disk image uses a single read-write ext4 partition with no read-only squashfs root filesystem, which allows to enlarge the partition. Features like Failsafe Mode or Factory Reset won't be available as they need a read-only squashfs partition to function.
[OpenWrt Wiki] VirtualBox Advanced
openwrt.org › docs › guide-userAug 15, 2020 · squashfs vs ext4 You'll likely need to select between a combined squashfs vs ext4 OpenWrt image to use 1). For most hardware supported by OpenWrt, combined-squashfs is recommended (and in many cases the only type of image offered). For x86 hardware where space is not an issue, OpenWrt is offered also in combined-ext4 images.
自编译 OpenWrt 系列 - 版本区别 | 美丽应用
https://mlapp.cn/1004.html23.10.2020 · 固件文件名中带有 ext4 字样的文件为搭载 ext4 文件系统固件,ext4 格式的固件更适合熟悉 Linux 系统的用户使用,在 Linux 下可以比较方便地调整 ext4 分区的大小; 固件文件名中带有 squashfs 字样的文件为搭载 squashfs 文件系统固件,而 squashfs 格式的固件适用于 “不折腾” 的用户,其优点是可以比较方便地进行系统还原,哪怕你一不小心玩坏固件,只要还能进入控 …