RPI U-boot Example App

Prepare application

There is an example application "interrupt.c" that is provided in u-boot but is not compiled. I'll use that to show how to enable an s-rec application.

• the interrupts executable needs a define to compile:

 edit u-boot-pi-rpi/examples/standalone/interrupt.c
 add NR_IRQS
 46a47,48
 > #define NR_IRQS 65
 > 

• Edit Examples Makefile:

 edit u-boot-pi-rpi/examples/standalone/Makefile
 add the executable to the end of the ELF-y variable
 
 29c29
 < ELF-y        := hello_world
 ---
 > ELF-y        := hello_world interrupt

• re-compile

 ./doit

load interrupts.srec

• see rPI U-boot run s-rec application for an example

 U-Boot> loads
 ## Ready for S-Record download ...

 ## First Load Addr = 0x0C100000
 ## Last  Load Addr = 0x0C10024E
 ## Total Size      = 0x0000024F = 591 Bytes
 ## Start Addr      = 0x0C100000
 U-Boot> 

run it

 U-Boot> go 0x0c100000 0
 ## Starting application at 0x0C100000 ...
 Installing handler for irq vector 0 and doing busy wait
 Press 'q' to quit
 <press q here>
 Interrupt handler has been uninstalled
 ## Application terminated, rc = 0x0
 U-Boot> 

Your application

• cp one of the example .c files in the examples/standalone directory that is "closest" to your application
• follow the steps above (add the executable to the makefile, compile, load and run)