yocto、buildroot等的区别

ArchLinux is just an ordinary desktop distro, that is distributed via prebuilt ISO images.
Buildroot, Yocto and Angstrom are embedded Linux distros, where you download the build system and then configure it for your target (select toolchain, packages etc.) and then build your bootloader, kernel and
root file system.

Yocto and Angstrom are based on
OpenEmbedded project. Buildroot has another approach and uses Kconfig system like Linux kernel.

So far I have used only Buildroot for ARM systems and am very comfortable with this distro. It is very easy to create and extend your first rootfs. But you'll probably have to try some of these distros to understand, which one suites your
needs. Look at distro's documentation, tutorials etc.

If you don't want to compile your rootfs, try ArchLinux. If you are familiar with
OpenEmbedded look at Yocto and Angstrom. If you like Kconfig try
Buildroot.