Good, loading the correct PRU driver works now.

However, now I face another problem: When I try to load a device tree 
overlay from the command line:

echo cape-unversalh > /sys/devices/platform/bone_capemgr/slots


my terminal gets stuck. Running dmesg from another terminal I get:

[  275.976817] bone_capemgr bone_capemgr: part_number 'cape-unversalh', 
> version 'N/A' 
> [  275.976866] bone_capemgr bone_capemgr: slot #4: override 
> [  275.976885] bone_capemgr bone_capemgr: slot #4: auto loading handled 
> by U-Boot


Cat reveals:
machinekit@beaglebone:~$ cat /sys/devices/platform/bone_capemgr/slots 
0: ------  -1  
1: ------  -1  
2: ------  -1  
3: ---l--  -1  
4: --O---  -1
 
I get the same result when disabling uboot overlays in the uEnv.txt

Am Donnerstag, 31. August 2017 20:11:56 UTC+2 schrieb Alexander Rössler:
>
> Thanks, that looks very promising.
>
> Am Donnerstag, 31. August 2017 18:26:57 UTC+2 schrieb RobertCNelson:
>>
>> On Thu, Aug 31, 2017 at 11:22 AM, Alexander Rössler 
>> <[email protected]> wrote: 
>> > Does not help, even if I enable pru overlay in the the uEnv.txt nothing 
>> > shows up. 
>> > 
>> >> git:/opt/scripts/:[2ce750d881941c5189db9e189af90517e11c079f] 
>> >> eeprom:[A335BNLT00C02814BBBK6438] 
>> >> dogtag:[BeagleBoard.org Debian Image 2017-08-21] 
>> >> bootloader:[microSD-(push-button)]:[/dev/mmcblk0]:[U-Boot 
>> >> 2017.09-rc2-00002-g84a7f2] 
>> >> bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot 
>> 2015.01-00001-gb2412df] 
>>
>> So, your eMMC's bootloader is getting in the way, hence your not 
>> booting what you expect: 
>>
>> so kill the MLO file via: 
>>
>> sudo dd if=/dev/zero of=/dev/mmcblk1 count=1 seek=1 bs=128k 
>>
>> Regards, 
>>
>> -- 
>> Robert Nelson 
>> https://rcn-ee.com/ 
>>
>

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