On Tue, May 9, 2017 at 1:47 AM, <[email protected]> wrote: > Hi there, > > I´m pretty new to Linux and the BBB. I´m using Debian Jessie and > struggling with the DTO. I think I have an little idea now how it works. I > try to export a dtbo to the slots. > > this is what i get when i cat the slotsfile: > > debian@beaglebone:/lib/firmware$ cat /sys/devices/platform/bone_ > capemgr/slots > 0: PF---- -1 > 1: PF---- -1 > 2: PF---- -1 > 3: PF---- -1 > 4: P-O-L- 0 Override Board Name,00A0,Override Manuf,univ-emmc > > but if I try to export a .dtbo from (for example the UART2 overlay) to the > slotsfile it says: > > debian@beaglebone:/lib/firmware$ sudo echo "BB-UART2-00A0.dtbo" > > /sys/devices/platform/bone_capemgr/slots > -bash: /sys/devices/platform/bone_capemgr/slots: Permission denied > > Why is the permission denied? I cant even unexport the slot #4: >
Your command is failing because the command is essentially two parts. Or, more correctly you're piping the output of one command, into a file. Both operations require elevated permissions, but the sudo command is only working for the first half. So if you run this command as root, it should work fine. Or you can run it thus. sudo sh -C "echo 'BB-UART2-00A0.dtbo' > /sys/devices/platform/bone_ capemgr/slots" You should be aware that sudo is not a direct replacement for being root, and as such some situations will work differently, or not at all in a few cases. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORokpfTrnXKKf0G8GYVZP%3DwJEFFb-1-mKAVgUzUZXHziQw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
