Greetings Robert, I apologize for the necro/somewhat-off-topic post. What is the best way to access PRU remoteproc carveouts from userspace?
I have a (working) project for reading an 8-bit parallel interface camera that I originally wrote using UIOPRUSS. I decided to take the plunge and work through the remoteproc documentation to see if I could move to that. I didn't want to use rpmsg, because I doubted it could handle the data velocity (320 x 240 x 24bit color x 15 frames per second = 3,456,000 bytes, roughly 3MB a second). I discovered carveouts in the resource table headers, and thought this was excellent since it was much like how I was already doing it with UIOPRUSS. It works and simplifies the code greatly, but I have to use debugfs to get the carveout location to mmap to, which seems less than ideal. Any suggestions appreciated. On Saturday, February 24, 2018 at 1:15:01 AM UTC-5, RobertCNelson wrote: > On Fri, Feb 23, 2018 at 9:52 PM, mallets <[email protected] > <javascript:>> wrote: > > There are a lot of useful guides and manuals all over the net for using > the > > PRUs on the BBB. Ex: > > > http://processors.wiki.ti.com/index.php/PRU_Training:_Hands-on_Labs#LAB_4:_Introduction_to_Linux_driver > > > But none of them seem to be applicable to the newer images/kernel. > Either > > the sysfs setup is wrong or those interfaces just don't exist. > > > > What is the best way to get started on PRU programming, using the latest > > kernel? > > I don't want to go back to an older image as I need the improved network > > latency provided by the 4.14 kernel (getting almost 30-40us better > latency > > over UDP, don't know how or why). Image info below. > > TI just recently merged in their pru changes into their v4.14.x > branch, just run: > > sudo /opt/scripts/tools/update_kernel.sh > > > > > dogtag:[BeagleBoard.org Debian Image 2017-10-10] > > bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot > > 2017.09-00002-g0f3f1c7907] > > kernel:[4.14.17-ti-r32] > > nodejs:[v6.12.3] > > uboot_overlay_options:[enable_uboot_overlays=1] > > 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:[uboot_overlay_pru=/lib/firmware/AM335X-PRU-RPROC-4-4-TI-00A0.dtbo] > > > > Remove this option ^... > > > uboot_overlay_options:[enable_uboot_cape_universal=1] > > pkg:[bb-cape-overlays]:[4.4.20180126.0-0rcnee0~stretch+20180126] > > pkg:[bb-wl18xx-firmware]:[1.20170829-0rcnee2~stretch+20180104] > > pkg:[firmware-ti-connectivity]:[20170823-1rcnee0~stretch+20170830] > > Regards, > > -- > Robert Nelson > https://rcn-ee.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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/0e664c0e-c293-4882-aee0-c8bb4f21beee%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
