RE: [ECOS] Lexar 4189 support

["Andrew Dyer" <adyer at righthandtech dot com>]

> -----Original Message-----
> From: ecos-discuss-owner@ecos.sourceware.org
> [mailto:ecos-discuss-owner@ecos.sourceware.org]On Behalf Of Bhaskar
> Sent: Monday, September 27, 2004 10:05 PM
> To: Nick Garnett
> Cc: Andrew Dyer; ecos-discuss@ecos.sourceware.org
> Subject: Re: [ECOS] Lexar 4189 support
> 
> 
> Hi all,
> Sorry.  It was a typing mistake.  But a good sense of humor.  
> I tried to
> find information about lexra 4189,  but I could not find 
> anything.  If I
> follow the basic MIPS 32  HAL and modify it,  I think that should be
> ok.  
> 
> Can somebody give some pointers of how to go about it?

The biggest problem will probably be those missing instructions.
You're going to need either a toolchain (gcc and friends) that
won't issue them (ie something lexra specific), or make sure that
they aren't ever in any code you generate.

I think the most common uses for those instructions are in unaligned
byte moves and if structure packing is turned on.

After this, you would copy/paste to make a new variant and platform hal
for lexra and your platform.  You're going to need at least a little
documentation on how to set up the coprocessor 0 registers in the chip
and how it's cache works.

Curiosity makes me wonder why are you wanting to port onto a 'dead'
platform?

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