Re: [RFC PATCH] ARM: cache-l2x0: add setup entry for l2 in non-secure mode

[Gioh Kim]

2014-05-19 ìí 6:11, Barry Song ì ê:
> 2014-05-19 8:29 GMT+08:00 Gioh Kim <gioh.kim@xxxxxxx>:
> > 2014-05-18 ìí 10:13, Barry Song ì ê:
> >
> > > 2014-05-15 13:39 GMT+08:00 Gioh Kim <gioh.kim@xxxxxxx>:
> > > > Hi,
> > > >
> > > > My board is using Trustzone and running kernel is non-secure mode.
> > > > But setup function of PL310 driver is only for secure mode kernel.
> > > >
> > > > What about adding an entry for non-secure mode setup function?
> > > >
> > > > I'm sorry for my poor code but I just wanna say what I need .
> > >
> > >
> > > Gioh,
> > >
> > > i don't really understand what is the user scenarios for this, if you
> > > are running linux in non-secure mode, your security-mode codes have
> > > enabled L2, so this makes non-secure linux have no chance to execute
> > > setup at all:
> >
> >
> > My platform runs linux kernel before L2 cache activation.
> > And the L2 cache is activated when the kernel sends command to Trustzone
> > firmware.
> > At this moment L2 is not activated. Linux should send command for L2
> > activation to Trustzone at the moment.
>
> i think you can send command to trustzone firmware to enable L2 at
> first, then make your Linux l2 driver run.

Right. My platform is working like that.
Activate L2 first and run l2x0 driver.

But I think many platforms have trustzone firmware and are working like my platform.
They might need non-secure setup.

> -barry
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