Hi, I'm new to this forum and to Beaglebone (Black) programming. Comming from Cortex M4 (Atmel's SAM4S XPlained Pro board), I made the step to Cortex A series processors.
I'm trying to set up the BBB as a pure bare metal device, without Linux or any other OS. I delved in Starterware with CCS, but unfortunately my SEGGER J-Link is supported by CCS only for about 3 months... So I'm switching to Eclipse development and am porting the Starterware code to the gcc ARM none eabi. I can compile the drivers, grlib, etc and run the boot process from my ide environment on the real hardware using J_Link JTag debugging. AFAIK It isn't possible uo use the standard C functions (like printf etc) in the bootloader because it doesn't use C startup code. I want to develop C/C++ code that runs in DDR3 space and uses C/C++ startup code to provide the nessecary functionality. I *Think* newlib is the way to go for embedded systems (writing my own stubs for _sbrk etc.) Now comes the tricky part : How to build a real bare-metal C/C++ application running in the DDR3 space... AFAIK the bootloader code must jump into the C/C++ startup code instead of directly to main. Also, which lib to include in the linker for the BBB? Where can I find the start address of that specific libc ? Secondary, the bootloaders first assemby file jumps to the 'main' as entry point in the c code, but I assume that the real application also has to have a 'main' function. How to distinguish both of them? One in the internal ram (0x402F0400....) and the other in DDR3 (0x8000000....) ? And how to jump from the bootloaders main to the applications main? Thanks in advance, Paul -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
