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Re: Re: redboot write to memory mapped register


On Tue, 2006-01-24 at 14:05 +1100, yh@bizmail.com.au wrote:
> Hello,
> 
> The following question should be asked whether the redboot can access
> memory mapped peripheral register (And how if it can?)?
> 
> I can access EP9301 internal register, but not able to access memory
> mapped peripheral registers (0x70000000 for example) by HAL_READ_UINT32
> and HAL_WRITE_UNIT32.

Note: this port isn't in the public repository, so what I say is not
authoritative.

I doubt that 0x70000000 has been mapped by the MMU, so eCos can't
access it at all.  If you need such access, you'll have to get it mapped
in - look in "include/hal_platform_setup.h" for your target.

> 
> Appreciate any helps.
> 
> Thank you.
> 
> Jim
> 
> > Hello,
> >
> > In redboot, if I want to write to peripheral register in sync memory (such
> > as 0x70000000 in cirrus EP9301 chip), can I directly placed the address
> > 0x70000000 into the HAL_WRITE_UINT32, or do I need to call
> > hal_virt_to_phys_address to convert 0x70000000 to physical address?

Note: asking [basically] the same question twice in the span of
two hours does not improve the likelihood of getting an answer.
This is a volunteer project and replies come when folks have
time :-)

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------


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