On Fri, Feb 23, 2018 at 9:52 PM, mallets <hemanthmahesh1...@gmail.com> 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]


Robert Nelson

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