[En-Nut-Discussion] Supporting Other Target Platforms

[Jan Dubiec]

On Sun, 01 Feb 2004 20:38:17 +0100, Harald Kipp <harald.kipp at egnite.de> wrote:
> Hi,
> 
> Some files in CVS had been split by CPU families:
> 
> os/timer.c: tmr_arm.c tmr_avr.c tmr_h8.c tmr_m68k.c
> os/thread.c: ctx_arm.c ctx_avr.c ctx_h8.c ctx_m68k.c
IMO there should be created "arch" directory with MCU/CPU dependent
subdirectories in it - please look at arch directory in the Linux
kernel sources as an example. Then the above files should be moved to
appropriate subdirectories. So finally there should be two eg. timer.c
files: first under "os" directory which should contain hardware independent
functions and the second under eg. "arch/h8300" with hardware dependent
stuff. Next, IMO it isn't elegant using
#if defined(__AVR_ATmega128__) || defined(__AVR_ATmega103__)
#include "tmr_avr.c"
#elif defined(__arm__)
#include "tmr_arm.c"
#elif defined(__H8300__)
#include "tmr_h8.c"
#elif defined(__m68k__)
#include "tmr_m68k.c"
#endif
IMO better solution is to compile all hardware dependent files
separately and consolidate them into one library, let's say libarch.a.

We should also take into account that different devices can be build
on the same MCU/CPU, eg. there are different EVBs for H8/3068F.

[.....]
> Other candidates are
> 
> 1. Atomic functions
> 2. Enter/Exit critical functions
> 3. Checksum calculation
> 4. Interrupt stuff
5. os/nutinit.c
6. Serial port stuf (initialization, enabling/disabling and control)
7. EEPROM stuff - AFAIK avr-gcc and Imagecraft do supply library with
   appropriate functions, H8 gcc doesn't

> I have currently now idea, wich compilers I should
> chose in the first place for ARM7TDMI, H8/300 or Coldfire.
Of course gcc. ;-) At least for H8/300H.

> Linux seems to be no big problem.
> Can anybody recommend any pre-build binaries for Win32?
Please look at http://www.kpitgnutools.com - you can find there Linux
and Windows gcc binaries for H8/300H and SuperH MCU families. In order
to download them you have to create an account first.

Regards,
/J.D.
-- 
Jan Dubiec, jdx at slackware.pl, mobile: +48 602 101787

Głęboka wiara wymaga płytkiego rozumu i nikłej wiedzy.