OMAP4 framebuffer

[Ivan Loskutov]

Thank you. I'll try this.

--
Ivan Loskutov




2012/7/13 Stefan Kalkowski <stefan.kalkowski at ...1...>

> Hi Ivan,
>
> On 13.07.2012 08:11, Ivan Loskutov wrote:
> > Hello.
> >
> > I try to extend OMAP4 frame-buffer driver for using with LCD. Your HDMI
> > example does not work. I try to read OMAP DSS registers and receive
> > strange values, for example: value DSS_REVISION is 0x02100004, other DSS
> > and DISPC registers has similar values. What version u-boot do you use
> > on pandaboard? Maybe part of the initialization is performed in u-boot.
>
> one issue is that currently the outer L2-cache isn't handled by
> Fiasco.OC (for the pandaboard). That means as long as it's enabled
> (already by u-boot) it will contaminate DMA regions used by the
> LCD-driver, that were already in the cache before.
>
> So one interim fix is to use an u-boot version which doesn't enable the
> L2-cache (CONFIG_SYS_L2CACHE_OFF variable in u-boot config). It doesn't
> explains the observed strange register values, but maybe this already
> enables you to use the LCD?
>
> We are still working at that L2-cache issue. First steps are done to
> enable L2-cache invalidation in Fiasco.OC, but there are some problems
> left. So please by now disable the L2-cache on the Pandaboard completely
> before using any DMA driven devices (USB-networking and LCD).
>
> Best regards
> Stefan
>
> PS: a ready to use u-boot image can be found here:
> https://github.com/downloads/nfeske/genode/u-boot.tgz
>
> >
> > --
> > Ivan Loskutov
> >
> >
> >
> >
> >
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> --
> Stefan Kalkowski
> Genode Labs
>
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