Thanks Robert, this is very useful information that I did not know.

On Wednesday, March 12, 2014 5:09:56 PM UTC-4, RobertCNelson wrote:
>
> On Wed, Mar 12, 2014 at 4:05 PM, Bit Pusher 
> <[email protected]<javascript:>> 
> wrote: 
> > Thanks John, this worked. I also tried modifying 
> > /lib/firmware/cape-boneblack-hdmi-00A0.dts to remove the conflicts 
> (without 
> > disabling HDMI in /boot/uboot/uEnv.txt) , and then recompiled to make a 
> new 
> > /lib/firmware/cape-boneblack-hdmi-00A0.dtbo, 
> > but dmesg still reported a conflict with P9_25 even though P9_25 and 
> mcasp0 
> > had been removed. This indicates to me that 
> > /lib/firmware/cape-boneblack-hdmi-00A0.dtbo is not being read from 
> > /lib/firmware at boot; do you know where it is being read from? Or can 
> you 
> > point me to a link for the process and places of loading overlay files 
> on 
> > the Ubuntu BBB at boot? I am really having difficulties finding 
> > documentation regarding this so any helpful links are appreciated. 
>
> With the current kernel config, all "firmware" is built into the 
> kernel.  We could disable that, but then it could take udev up to 60 
> seconds to actually find it on debian/ubuntu based systems.  Best 
> thing to do is disable all the capes in uEnv.txt then write an init 
> script to load that specific *.dtbo into the slot early in bootup. 
>
> Regards, 
>
> -- 
> Robert Nelson 
> http://www.rcn-ee.com/ 
>

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