Re: [ECOS] PowerPC hangs on memory read

[Nick Garnett <nickg at ecoscentric dot com>]

"Anthony Tonizzo" <atonizzo@lycos.com> writes:

> Nick:
> 
> >It is only called at startup. 
> 
> I spent a good deal of time trying to go to the bottom of
> this. I perused the source code and found that the function
> hal_MMU_init() does all the initialization, and for my
> board defines 3 areas which I was able to identify. By
> placing my PCMCIA memory area in an unused section of one
> of the three, my code ran with MMU enabled. 
> 
> Problem solved, almost.
> 
> Infact, I tried to understand the working of it all, and
> I noticed that hal_MMU_init() relies on a cyg_hal_mem_map[]
> to provide the areas under MMU watch. But I cannot
> figure out where cyg_hal_mem_map[] is defined. I grep'd
> the whole source tree and it appears in two places
> (hal_mem.h and hal_misc.c) and in neither place the
> table contents are defined.
> 
> When/where are the contents of cyg_hal_mem_map[] defined?
> 

It's defined using the macros define by hal_mem.h in the platform HAL,
look for CYGARC_MEMDESC_* .


-- 
Nick Garnett                    eCos Kernel Architect
http://www.ecoscentric.com/     The eCos and RedBoot experts


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