I see that on 4.1.14-bone-rt-r17 kernel the edma fix is compiled into the am335x-boneblack-emmc-overlay.dtb resulting in any audio cape overlay not loading.
so i guess i can grab this file https://github.com/beagleboard/linux/blob/4.1/arch/arm/boot/dts/am335x-boneblack-emmc-overlay.dts but i have no idea how to complie it and what paths i need to include to get it to complie I am wondering why that *fix* was needed and why it wants to enable the davinci_mdio_default pins so we cant enable audio overlays On 4/20/2016 1:28 PM, Rick Mann wrote: > The DTB I posted includes am33xx-overlay-edma-fix.dtsi, which enables mcasp0 > and mcasp1. This causes the snd_soc_davinci_mcasp driver to load, and it > configures itself at that time. But that DTB doesn't have the necessary > entries for that driver to properly configure. When you then later load the > overlay (e.g. BB-BONE-AUDI-02), the driver ignores the new entries. > > There are a couple of solutions. The best is to move all the remaining > entries that are in the overlay into a new .dts file based on this < > http://pastebin.com/Wja7ZQRk>, compile that, and load it at boot. > > Or, compile this .dts <http://pastebin.com/vny3wpnq> and load it at boot, > then load the cape overlay. The drawback to this is (apparently) the eDMA > slots won't get assigned properly for mcasp, so there might be issues down > the road. It seems to work as-is for me, but I don't know if there is higher > CPU loading, or what. I don't really understand the eDMA issues. > >> On Apr 20, 2016, at 11:48 , Rafael Vega <conta...@rafaelvega.co> wrote: >> >> Thanks Rick! >> >> When you say the driver ends up not being properly configured when you load >> the overlay, does that mean I should not load the overlay? Or should I load >> it and expect problems? which problems? >> >> >> On Tuesday, April 19, 2016 at 3:05:22 PM UTC-5, Rick M wrote: >> >>> On Apr 19, 2016, at 10:27 , Rafael Vega <cont...@rafaelvega.co> wrote: >>> >>>> dtb=am335x-boneblack-audio.dtb >>>> >>>> doesn't setup the emmc... >>> Does this mean that the board won't be able to boot from the emmc when >>> using this dtb? If so, how is it supposed to be used? >> I had to make one that also enabled the emmc: >> >> http://pastebin.com/Wja7ZQRk >> >> Note that there's a problem with that file. It includes >> am33xx-overlay-edma-fix.dtsi, which causes the mcasp driver to load first, >> and it ends up not being properly configured when you load the overlay. I'll >> be writing a full DTS for my project, rather than use the overlay mechanism, >> but for now that's how I do it. >> >> >> >> -- >> Rick Mann >> rm...@latencyzero.com >> >> >> >> >> -- >> 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. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/394a008d-c039-429b-8814-56c9183b7d37%40googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. > --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/5717EA78.6070302%40gmail.com. For more options, visit https://groups.google.com/d/optout.
