I'm developing an application on C8051F340 and I want to implement a bootloader for it, so I referred to the example code and notes of AN533. When I try to compile the code with Keil uV4, it reports "can't open file si_toolchain.h". I'm completely new to the development on C8051F and have no idea where I can get this si_toolchain.h and related libraries. Any directions?

The notes can be downloaded from https://www.silabs.com/documents/public/application-notes/AN533.pdf . 

the example code can be downloaded from https://www.silabs.com/documents/public/example-code/an533sw.zip .