[okl4-developer] About the virtual memory management of OKL4

[Jorge Torres]

Hi kashin,


At okl4 microkernel; resources accessible from MMU are always mapped, which
might be the case of your DSP, I cannot explain it better than the
okl4-progmanual, which you can find at the oklabs web site, please read the
address spaces section (A-3),

Cheers,

Jorge

On Nov 12, 2007 10:30 AM, kashin Lin <kashin08 at gmail.com> wrote:

> Hi,
>
> i have some quetions about the virtual memory management of OKL4.
> ( i am not familiar with
> its manage rule, are there any documents i can refer to?)
>
> following are my questions:
> 1. what is the scheme of the mapping from PHY address to VIRT address in
> OKL4 (pistachio)?
>     what source codes deal with it?
>
> 2. the platform i run OKL4 is a development board with a
> xscale pxa270 CPU  and a DSP.
>     i know the PHY address of the DSP, and CPU can transfer data to it
> through this address.
>     but in OKL4, it seems it used VIRT memory instead of PHY memory.
>     so how to let the L4's application transfer data to DSP?
>     if i should build the PHY address to VIRT address mapping first,
> what files i should modify?
>     or i can use PHY address directly?
>
> thanks for your help
>
>
> Best regard,
>
> kashin lin
>
>
>
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