On 5/8/2014 1:58 PM, Hannes Hörting wrote:
> Hello Charles!
> 
> I made an own Overlay, but it seems I made an error.
> I use in my new file:
>     /* identification */
>     part-number = "cape-bone-myoverlay";
>     version = "00A1";

<snip>

It looks like you're working on the HDMI version of the universal
overlay that I haven't gotten around to implementing yet.  I encourage
you to clone the github repo and send a pull request when you're finished!

> But when I try:
> echo cape-myoverlay > /sys/devices/bone_capemgr.9/slots
> 
> I get:
> bash: echo: write error: Invalid argument
> 
> Maybe you know where I made a mistake? Is it the own itendifier?
> Or are my file wrong? Then I can upload maybe here to doublecheck.

This generally means you are trying to access a resource that is already
assigned to something else.  Sometimes you will find useful hints in the
output of dmesg.  Otherwise, short of digging out the kernel debugging
tools, I usually either just stare at the dts file looking for problems,
or start bisecting (ie: comment out chunks of the dts file until it
loads, then start adding back in until it fails).

-- 
Charles Steinkuehler
char...@steinkuehler.net

-- 
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