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.
-- Ivan Loskutov
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
Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
Genode-main mailing list Genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
Hi Ivan,
On 07/13/2012 08:11 AM, 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.
Yes that could be the case. We use the Linaro-version of u-boot (git://git.linaro.org/boot/u-boot-linaro-stable.git) on the 'Linaro-u-boot-2011.12' branch. The behavior you describe though, kind of looks like as if the I/O memory base of the controller might be wrong. What version of the PandaBoard do you use? We only tested the thing on ES.
Sebastian
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
Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
Genode-main mailing list Genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
-- Stefan Kalkowski Genode Labs
http://www.genode-labs.com/ · http://genode.org/
Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth
Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Genode-main mailing list Genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
I use PandaBoard 4430 Rev.A4. -- Ivan Loskutov
2012/7/13 Sebastian Sumpf <Sebastian.Sumpf@...1...>
Hi Ivan,
On 07/13/2012 08:11 AM, 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.
Yes that could be the case. We use the Linaro-version of u-boot (git://git.linaro.org/boot/u-boot-linaro-stable.git) on the 'Linaro-u-boot-2011.12' branch. The behavior you describe though, kind of looks like as if the I/O memory base of the controller might be wrong. What version of the PandaBoard do you use? We only tested the thing on ES.
Sebastian
Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Genode-main mailing list Genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
Thanks. With your u-boot HDMI is work and DSS registers read correct.
-- 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
Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
Genode-main mailing list Genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
-- Stefan Kalkowski Genode Labs
http://www.genode-labs.com/ · http://genode.org/
Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth
Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Genode-main mailing list Genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
-
Ivan Loskutov -
Sebastian Sumpf -
Stefan Kalkowski