[ECOS] PowerPC hangs on memory read
Anthony Tonizzo
atonizzo@lycos.com
Fri Jun 18 13:46:00 GMT 2004
Andrew:
> You you checked the MMU setup? Maybe you don't have
> access to this location?
I had a hunch it was MMU, but I was under the mistaken
impression that when enabled, the MMU was mapped to a 1:1
correspondence between logical and physical address
_for_the_whole_extent_of_the_memory_ (this is not as
wasteful as it sounds since all the addressable space can
be covered with large memory blocks resulting in acceptably
sized translation tables).
Obviously I was wrong, because once I recompiled Ecos
to disabled the MMU, everything works alright.
I peeked around, and I found one particularly interesting
function in the HAL, cyg_hal_map_memory(). Can
this function be called at any time or is it a setup only
call? In other words, can you augment the MMU translation
table at any time?
Thanks for your help!
Tony
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