[En-Nut-Discussion] Porting to other platforms

[Mike Cornelius]

Hi Harald,

Yup, the H8 has 24 bit address bus and 16 bit data bus with 32 bit internal
registers.
The hardware I'm working with (Nokia Smart Adapter) actually has 512KB flash
and 256K SRAM.

One thing i've noticed so far is the casting of pointers to u_shorts in
heap.c and thread.c , this is OK if pointers are 16 bit as on the AVR but
does not work so well on the H8 or the ARM.

I'm just casting them to u_ints instead which at a guess should be a more
portable way to do things.

One thing to think about, should there be a different variant of thread.c
and atom.h (and any others I havn't discovered yet) for each processor or
should there be one difficult to read version with countless #ifdefs ?


Mike

-----Original Message-----
From: en-nut-discussion-admin at egnite.de
[mailto:en-nut-discussion-admin at egnite.de]On Behalf Of Harald Kipp
Sent: Thursday, July 03, 2003 6:10 PM
To: en-nut-discussion at egnite.de
Subject: [En-Nut-Discussion] Porting to other platforms


Mike,


>BTW I am in the middle of porting NutOS to the Renesas (Hitachi) H8S, I'm
>not sure if anybody cares for such a thing but let me know if you do.

That sounds great. I'm trying to limit the number of changes
right now, but we need a more complex change next. I'll do
a port to ARM7. Do to this I have to follow some of the
advices of Ralph Mason. Let's keep in touch, I'll inform
you when I'm going to implement some system wide changes.

Unfortunately the MSP430 still doesn't support external
memory. Does the H8 do? If not, it won't be able to run
a TCP stack unless it contains 16k of internal RAM.

Harald

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