Hi Robert, I am currently using the uboot_overlay_addrX scheme, and it seems the driver is always using PIO even for large SPI transfers (between 1024 and 3072 bytes). Under 3.8.13 I was using the Kernel overlay mechanism with success (DMA worked), but this past week I just switched to the more recent stuff that no longer supports the cape manager "slots" file, meaning, all overlays are in the uEnv.txt (or part of the main DTB). I'd rather not monkey with the main DTB, however, if that's the only way to get SPI+DMA then I guess I'll have to do that. Do I need a newer kernel and/or u-boot? version.sh output attached.
Thanks John -- 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/2358c98a-e8ce-4a4c-9029-df9e9615acc4%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
root@beaglebone:~# /opt/scripts/tools/version.sh git:/opt/scripts/:[e307a944e0be0610ff5296e0abe4ad31a6e70daa] eeprom:[A335BNLT00C03917BBBK1E2F] model:[TI_AM335x_BeagleBone_Black] dogtag:[BeagleBoard.org Debian Image 2018-03-05] bootloader:[microSD-(push-button)]:[/dev/mmcblk0]:[U-Boot 2018.01-00002-ge9ff418fb8]:[location: dd MBR] bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot 2018.01-00002-ge9ff418fb8]:[location: dd MBR] kernel:[4.9.99-bone10] nodejs:[v6.13.0] uboot_overlay_options:[enable_uboot_overlays=1] uboot_overlay_options:[uboot_overlay_addr4=/lib/firmware/BB-RGBSPI1-00A0.dtbo] uboot_overlay_options:[disable_uboot_overlay_video=1] uboot_overlay_options:[disable_uboot_overlay_audio=1] uboot_overlay_options:[disable_uboot_overlay_wireless=1] uboot_overlay_options:[disable_uboot_overlay_adc=1] pkg:[bb-cape-overlays]:[4.4.20180305.0-0rcnee0~stretch+20180305] pkg:[bb-wl18xx-firmware]:[1.20170829-0rcnee2~stretch+20180104] pkg:[firmware-ti-connectivity]:[20170823-1rcnee0~stretch+20170830] groups:[debian : debian adm kmem dialout cdrom floppy audio dip video plugdev users systemd-journal i2c bluetooth netdev cloud9ide gpio pwm eqep admin spi tisdk weston-launch xenomai] cmdline:[console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk0p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 quiet] dmesg | grep pinctrl-single [ 3.648452] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568 dmesg | grep gpio-of-helper END
