Re: [9fans] Small bits of progress on SIMpad, couple of ARM questions

["Devon H. O'Dell " <dodell@offmyserver.com>]

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On Sun, Apr 10, 2005 at 11:36:03AM -0600, Michael Zappe wrote:
> Well, I just did the same thing for OpenBSD on IXP (XScale core), and 
> here are some of the issues you may want to look at. 
> 
> It seems there's an errata with the XScale core that causes 
> self-modifying code (including linkers and loaders) not to work if write 
> coalescing is disabled in CP15.  Check to make sure that it is enabled 
> in register 0. 
> 
> Also, make sure that the cache flush you are calling invalidates the 
> I-cache after flushing the D-cache. 
> 
> One other thing to try to make sure that it's a cache issue (what it 
> sounds like), is to try running it with caches disabled on startup.
> 
> If you need any more help, feel free to contact me!
> 
>    Mike

Thanks for the offer, certainly will do. I'll open up that ARM
spec and the SA-1110 datasheet again tomorrow and see if I can't
apply some of your tips. Charles and Bruce Ellis also responded
off-list with tips of their own.

I'll see if these tips combined get me any further, otherwise
I'll just accept the offers and bug you guys some more ;).

--Devon

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