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About BSP: are the packages needed to build an image for a specific architecture.
About cross-toolchain: "..is a collection of software development tools and utilities that run on one architecture and allow you to develop software for a different, or targeted, architecture. These toolchains contain cross-compilers, linkers, and debuggers that are specific to the target architecture.."
You could get more information in here: Yocto Project Development Manual
So,the BSP is something like linux-src package,right?