AW: Loading RTEMS applications from u-boot on Raspberry Pi 2

[Jan.Sommer at dlr.de]

Hi Cláudio,

I build a current BSP for the raspberry pi 2 recently (atm without SMP though).

> -----Ursprüngliche Nachricht-----
> Von: devel [mailto:devel-bounces at rtems.org] Im Auftrag von Cláudio Maia
> Gesendet: Montag, 17. Februar 2020 21:19
> An: devel at rtems.org
> Betreff: Loading RTEMS applications from u-boot on Raspberry Pi 2
>  

[...]

> 
> -------------------
> For approach #2, I do the following:
> 

I skip the whole mkimage step entirely and boot the elf-files directly.
So my u-boot commands look like this:

U-Boot> fatload mmc 0 0x30000000 ticker.exe
4043404 bytes read in 169 ms (22.8 MiB/s)
U-Boot> bootelf 0x30000000
## Starting application at 0x00200080 ...

RTEMS RPi 2B 1.1 (1GB) [00a01041]

*** BEGIN OF TEST CLOCK TICK ***

Note, that I load the file quite far at the end of the RAM to avoid conflicts with the sections loaded by the elf-file.
When I used lower values (below 0x10000000), my application got stuck at transfer to RTEMS as well.
Maybe that is also the problem with your image loading?

> $ arm-rtems5-objcopy -R -S -O binary hello.exe hello.bin
> $ mkimage -A arm -O rtems -T kernel -C none -a 0x200000 -e 0x200080 -d
> hello.bin hello-rtems.img
> 
> Image Name:
> Created:      Mon Feb 17 13:59:50 2020
> Image Type:   ARM RTEMS Kernel Image (uncompressed)
> Data Size:    1055340 Bytes = 1030.61 kB = 1.01 MB
> Load Address: 00200000
> Entry Point:  00200080
> 
> Then, after u-boot loads on the target, I do the following:
> 
> U-Boot> fatload mmc 0:1 0x200000 hello-rtems.img
> reading hello-rtems.img
> 1055404 bytes read in 103 ms (9.8 MiB/s)
> 
> U-Boot> iminfo
> 
> ## Checking Image at 00200000 ...
>    Legacy image found
>    Image Name:
>    Image Type:   ARM RTEMS Kernel Image (uncompressed)
>    Data Size:    1055340 Bytes = 1 MiB
>    Load Address: 00200000
>    Entry Point:  00200080
>    Verifying Checksum ... OK
> 
> U-Boot> bootm 0x200000
> ## Booting kernel from Legacy Image at 00200000 ...
>    Image Name:
>    Image Type:   ARM RTEMS Kernel Image (uncompressed)
>    Data Size:    1055340 Bytes = 1 MiB
>    Load Address: 00200000
>    Entry Point:  00200080
>    Verifying Checksum ... OK
>    Loading Kernel Image ... OK
> ## Transferring control to RTEMS (at address 00200080) ...
> 
> After this point, nothing happens on the board.
> -------------------
> 
> Thank you in advance. Regards
> Cláudio Maia
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