[En-Nut-Discussion] Porting to other platforms

[Ralph Mason]

I need to get the stuff that I have done out here somehow.

I have all of NutOS (excluding the Nic stuff) running on windows, so have
modified all that stuff already. So it should run on 16bit and 32bit
targets.

As part of that I have 80x86 assembly for thread switching.

I also have support for paged environments (it runs on my avr with 128kb
quite happily)

And on the same note, I also have an 'alternative' version 2 of PPP
interface which isn't as polished as the released one, but has (IMHO) some
other nice features.

I guess my problem with releasing it is it is a little divergent from the
main Nut branch.

Any attached are a few files, if you run across other problems, just drop me
a note I am sure I have already fixed them.

Ralph

**NOTE FILES NOT ATTACHED**
They are too big for the mailing list.



> -----Original Message-----
> From: en-nut-discussion-admin at egnite.de
> [mailto:en-nut-discussion-admin at egnite.de]On Behalf Of Mike Cornelius
> Sent: Thursday, 3 July 2003 8:53
> To: en-nut-discussion at egnite.de
> Subject: RE: [En-Nut-Discussion] Porting to other platforms
>
>
> 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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