In message 587a08410808060856v4b7a1b25u69ea80ff1b867c6d@mail.gmail.com you wrote:
Theory: Link the switch driver software with the u-boot.bin and flash it on the board. Switch driver's entry point would be called somewhere in u-boot to initialize it. Size of the u-boot.bin will increase and the u-boot partition on the NOR flash will need to be updated to accommodate the new binary size.
You have the source code of the switch driver software? And it comes with a GPL compatible license?
Questions: 1.) Which design is recommended, first or the second? Second is easier for me to implement as I don't have to change the partition sizes but could easily be overlooking some obvious problems.
I would conside the switch driver code to be driver code like any othr, i. e. it should go into the drivers/ directory and then be linked with U-Boot like any other U-Boot code.
2.) If the first design is recommended, I would need to resolve the u-boot-not-booting issue when the binary is compiled with switch driver. Any suggestions where to look?
Don't play any tricks with modifying the linker command line. Just add your driver code like any other driver to the source tree and let the exsiting Makefiles do the rest.
Best regards,
Wolfgang Denk