[En-Nut-Discussion] Ethernut3 Code in ROM and in RAM

[Harald Kipp]

ml schrieb:
> does anyone know the easiest way to get some peaces of code running in RAM
>   
Hi Martin,

Martin Thomas published some infos
http://www.siwawi.arubi.uni-kl.de/avr_projects/arm_projects/#gcc_ramfunc

I recently ported umon to Ethernut 3, which uses a Tiny File System for 
executables. It's available at
http://www.ethernut.de/arc/?C=M;O=D
umon-ethernut3-20070730.zip
Note, that this is work in progress and not finished. A linker script 
for Ethernut 3 is included (umon_ports/ethernut3/ETHERNUT3_boot.ldt). 
You can use tfpt to store executable binaries in the file system (using 
a function in RAM) and later load them into RAM for execution. It should 
be possible to enhance it. The user's manual for the monitor is 
available at various places, for example at
http://www.cadenux.com/bsp/umon_manual.pdf
> Or can i store a complete bin file as a part of my rom-code, transfer it
> completely to ram 
> and start it there ?
This is called In-Place Execution and sometimes used with Flash File 
Systems. It is not trivial, as it requires location independent code.

Harald