I think that if processor pin R13 is in high impedance, it shouldn't be necessary to remove R160. I want to control a WaveShare card in 4 bit sdio mode connected to mmc2. Did you succed with mmc2 configuration by device tree? In that case, could you share the devtree source file? Thank you,
On Friday, January 24, 2014 6:05:03 PM UTC+1, Alberto Potenza wrote: > > Dear all, > > according to AM335xx TRM, a beaglebone black should have 3 mmc available: > -> mmc0 (sd card) > -> mmc1 (2G flash) > -> mmc2. > > I am trying to enable mmc2 by device tree (and I am quite sure to have the > right pin settings) but, by doing > dmesg > I obtain: > > /ocp/mmc@47810000: can't find DMA channel > omap_hsmmc mmc.11: unable to obtain RX DMA engine channel 65 > > By putting the oscilloscope probe on the header (e.g. the mmc2_clk > signal), I do not see any transition. > I already removed R 160 to have mmc2_cmd accessible but I do not see any > transition also there. > > I tried both to enable it by echo > /sys/devices/..../slots and by > "capemgr.enable_partno" with no success: > I can see it in /sys/devices/..../slots (with the L meaning loaded)..but > no way to see any signal on the header. > > I already googled it but answers are not clear at all. > Did someone have success where I am failing? > > My uname -a is: > Linux beaglebone 3.8.13 #1 SMP Tue Jun 18 02:11:09 EDT 2013 armv7l > GNU/Linux > > Thanks for your help. > > > -- 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]. For more options, visit https://groups.google.com/d/optout.
