TrustZone Vmm Questions

[Ofer Hasson]

I'll look into it, thanks a lot !

On Mon, Jun 8, 2015 at 12:51 PM, Stefan Kalkowski <
stefan.kalkowski at ...1...> wrote:

> Hi Ofer,
>
> On 06/07/2015 12:40 PM, Ofer Hasson wrote:
> > I managed to pass data, solved it using "ioremap_nocache",
>
> I think you should start with allocating the memory in an uncached
> fashion instead of remapping it uncached (having the same memory region
> with different memory attributes in the MMU can cause serious problems),
> have a look at the 'dma_alloc_coherent' function within Linux. Moreover,
> you can read this for further background:
> http://linuxkernelhacker.blogspot.de/2014/07/arm-dma-mapping-explained.html
>
> > With regards to the restart, still no success.
>
> There is no restart mechanism implemented until now. The right place to
> do this is the platform driver. You could extend the platform session
> interface by a restart function. Then you can e.g. implement an input
> driver client, or GPIO button client that triggers this function when
> the key or button is pressed. To actually reset the board you should
> have a look at the watchdog timer in Freescale's reference manual.
>
> Regards
> Stefan
>
> >
> > Thanks.
> >
> > On Sun, Jun 7, 2015 at 9:07 AM, Ofer Hasson <hassonof at ...310...>
> wrote:
> >
> >> Hello,
> >>
> >> I'm trying to pass data between worlds, currently I'm allocating kernel
> >> space buffer in the normal world (Linux), passing the address using r0
> >> register and the size using r1 register.
> >> I manage to read the buffers reliably.
> >> When I'm trying to change the buffers in the secure world, I don't see
> the
> >> change in the normal world, at first i thought there was some compiler
> >> optimization issues, now I use -O0, next i thought this was CPU cache
> >> issues and now i use "flush_kernel_kmaps()" but still nothing.
> >> Any idea's on this issue ?
> >>
> >> Another question, how to i restart the board (iMX53) from genode code in
> >> the secure world ?
> >>
> >> Thanks a lot
> >>
> >
> >
> >
> >
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> >
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>
> --
> Stefan Kalkowski
> Genode Labs
>
> http://www.genode-labs.com/ · http://genode.org/
>
>
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