Hi Mahe,
I have no sure formula for your problem but some hints.
While developing HDMI drivers for the Arndale and the Panda board, we had to realize that the corresponding reference manuals provided insufficient information for our needs. Thus we switched to another approach. First, we looked out for a Linux-based system that was able to run HDMI on the targeted board (maybe http://eewiki.net/display/linuxonarm/i.MX6x+SABRE+Lite helps). Then we replaced the kernel of this system by a Linux that we build by ourselves using preferably identical sources and configs. If the system still worked after this, we modified the kernel in such a way that it provided a trace of the raw MMIO-accesses that are relevant for HDMI. This can be done using printk either by patching the generic __raw_read*() / __raw_write*() macros in arch/arm/include/asm/io.h (in this case, early-startup stuff and UART must be filtered out) or by patching driver specific functions (e.g. hdmi_write_reg/hdmi_read_reg). Be aware that HDMI normally depends also on other components such as power/clock management or graphic preprocessors.

Martin

On 30.06.2014 13:21, Mahe Mohan wrote: