Loading RTEMS-application with U-boot on Raspberry Pi or MicroZed

[Sebastian Huber]

On 11/04/16 15:43, Jan Sommer wrote:
> I just tried the same setup with the Xilinx MicroZed board at work.
> There, the same behaviour appears.
> If I compile a simple bare metal application I can load the binary to 
> the correct address and run it or load the elf-file somewhere into the 
> memory and use the bootelf-command to start the application.
> If I try to do the same with a compiled RTEMS-application, it won't 
> work. The same RTEMS-application runs if I put it directly into the 
> bootimage (without using u-boot).
>
> How does it work on other ARM-boards? The BeagleBone uses u-boot to 
> load all its binaries, doesn't it? 

You have to specify the correct entry and load addresses for the 
mkimage.  For example:

readelf -l ticker.exe

Elf file type is EXEC (Executable file)
Entry point 0x400145
There are 5 program headers, starting at offset 52

Program Headers:
   Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
   EXIDX          0x00ec70 0x0040eb70 0x0040eb70 0x00008 0x00008 R 0x4
   LOAD           0x000100 0x00400000 0x00400000 0x0ebc4 0x0ebc4 RWE 0x40
   LOAD           0x00ecc8 0x20401148 0x0040ebc4 0x006a4 0x006a4 RW 0x8
   LOAD           0x00f380 0x20400000 0x20400000 0x00000 0x5f000 RW 0x20
   LOAD           0x00f36c 0x2045f000 0x2045f000 0x00000 0x01000 RW 0x1

  Section to Segment mapping:
   Segment Sections...
    00     .ARM.exidx
    01     .start .text .init .fini .rodata .ARM.exidx .eh_frame 
.init_array .fini_array .jcr .rtemsroset
    02     .data
    03     .vector .bss .work
    04     .xbarrier .robarrier .rwbarrier .stack .nocachenoload

Then use:

mkimage -a 0x00400000 -e 0x400145

-- 
Sebastian Huber, embedded brains GmbH

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