I was having an issue loading multiple device tree overlays. I was hoping that someone could help me or maybe point me to a discussion thread I have overlooked.
The issue is that I have three device tree overlays that I would like to manually upload on my beaglebone. However, only the first of the overlays that I echo to slots will show up on pingroups and be recognized by the machine. My device info: root@arm:/boot/uboot# uname -a Linux arm 3.8.13-bone40 #1 SMP Fri Jan 31 07:31:37 UTC 2014 armv7l GNU/Linux This is how my slot configuration appears upon starting. As can be seen there are 4 overlays that are automatically loaded: root@arm:/lib/firmware# cat /sys/devices/bone_capemgr.8/slots 0: 54:PF--- 1: 55:PF--- 2: 56:PF--- 3: 57:PF--- 4: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART2 6: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART4 7: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART5 8: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-SPIDEV1 Using the command below I am able to manually add an overlay. This will be recognized in the pingroups without issue. root@arm:/lib/firmware# echo enable-uart3 > /sys/devices/bone_capemgr.8/slots How my slots appear after the addition. 0: 54:PF--- 1: 55:PF--- 2: 56:PF--- 3: 57:PF--- 4: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART2 6: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART4 7: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART5 8: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-SPIDEV1 11: ff:P-O-L Override Board Name,00A0,Override Manuf,enable-uart3 However when I try to add another overlay, it appears in slots but does have any effect in pingroups. The commands I used are below. root@arm:/lib/firmware# echo enable-gpio32> /sys/devices/bone_capemgr.8/slots root@arm:/boot/uboot# cat /sys/devices/bone_capemgr.8/slots 0: 54:PF--- 1: 55:PF--- 2: 56:PF--- 3: 57:PF--- 4: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART2 6: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART4 7: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART5 8: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-SPIDEV1 11: ff:P-O-L Override Board Name,00A0,Override Manuf,enable-uart3 12: ff:P-O-L Override Board Name,00A0,Override Manuf,enable-gpio32 My third overlay is called enable-dcan1 but it exhibits the same behavior as above so I will not show the process of adding it. Initially assumed that I had compiled an overlay incorrectly, but upon further experimentation I realized that the first overlay was always the one that got recognized by the machine and the other two were ignored. A few of my thoughts: Could the skipping of slots (4-6) and (8-11) be causing some sort of issue. Is there a maximum number of possible overlays that I have reached which prevents any more from being recognized. I would appreciate any help that people can supply. Thanks, Tim Rackers -- 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
