Re: [beagleboard] How to enable and use pru-rproc/remoteproc interface for 4.14 kernel on debian?

[Bill M]

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  > 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 
> > 2017.09-2-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/ 
>

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Re: [beagleboard] How to enable and use pru-rproc/remoteproc interface for 4.14 kernel on debian?

[Robert Nelson]

On Fri, Feb 23, 2018 at 9:52 PM, mallets  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
> 2017.09-2-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/

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[beagleboard] How to enable and use pru-rproc/remoteproc interface for 4.14 kernel on debian?

[mallets]

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.

dogtag:[BeagleBoard.org Debian Image 2017-10-10]
bootloader:[eMMC-(default)]:[/dev/mmcblk1]:[U-Boot 2017.09-2-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]
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]


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