Thank you. I'll try this.
-- Ivan Loskutov
2012/7/13 Stefan Kalkowski <stefan.kalkowski@...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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