PRUSS under Debian beta

[Sherman Boyd]

Hello.  I'm trying to get PRUSS working with the new Debian beta image.  I've got things working on Angstrom, but not on Debian.  I'm using kernel 3.8.13-bone50, is anybody else using PRUSS on this kernel?

[Charles Kerr]

Yes.  Did you enable the PRU ?  

if you do the following: cat /sys/devices/bone_capemgr.9/slots

Does it show the PRU enabled?

If not, look in /lib/firmware for a dtbo that has the PRU , and do an:echo PRUDTBOFILE > /sys/devices/bone_capemgr.9/slots

[Sherman Boyd]

It's not showing as enabled:

# lsmod

Module                  Size  Used by

uio_pruss               4066  0

g_multi                50407  2

libcomposite           15028  1 g_multi

mt7601Usta            641118  0

# cat /sys/devices/bone_capemgr.9/slots

 0: 54:PF---

 1: 55:PF---

 2: 56:PF---

 3: 57:PF---

 4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G

 5: ff:P-O-L Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI

# echo /lib/firmware/BB-BONE-PRU-01-00A0.dtbo > /sys/devices/bone_capemgr.9/slots

-bash: echo: write error: No such file or directory

But the command doesn't work.  Am I doing it right?

Best regards,

Sherman Boyd

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[Robert Nelson]

On Tue, Jul 1, 2014 at 3:49 PM, Sherman Boyd <sherma...@gmail.com> wrote:
> It's not showing as enabled:
>
> # lsmod
> Module Size Used by
> uio_pruss 4066 0
> g_multi 50407 2
> libcomposite 15028 1 g_multi
> mt7601Usta 641118 0
>
> # cat /sys/devices/bone_capemgr.9/slots
> 0: 54:PF---
> 1: 55:PF---
> 2: 56:PF---
> 3: 57:PF---
> 4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
> 5: ff:P-O-L Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
>
> # echo /lib/firmware/BB-BONE-PRU-01-00A0.dtbo >
> /sys/devices/bone_capemgr.9/slots
> -bash: echo: write error: No such file or directory

http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Privileged_echo

sudo sh -c "echo BB-BONE-PRU-01 > /sys/devices/bone_capemgr.9/slots"

Regards,

--
Robert Nelson
http://www.rcn-ee.com/

[Sherman Boyd]

Thank you.

root@beaglebone:~# cat /sys/devices/bone_capemgr.9/slots               0: 54:PF---

 1: 55:PF---

 2: 56:PF---

 3: 57:PF---

 4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G

 5: ff:P-O-L Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI

root@beaglebone:~# modprobe uio_pruss

root@beaglebone:~# echo BB-BONE-PRU-01 >/sys/devices/bone_capemgr.9/slots

root@beaglebone:~# cat /sys/devices/bone_capemgr.9/slots               0: 54:PF---

 1: 55:PF---

 2: 56:PF---

 3: 57:PF---

 4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G

 5: ff:P-O-L Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI

 7: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-BONE-PRU-01

Best regards,

Sherman Boyd

[Bit Pusher]

We have been using the PRUSS's extensively on bone70; with mostly success, but every so often, memory gets corrupted, and we have to reboot. This behavior is aperiodic and we have not been able to track it down yet (the PRUSS's can write anywhere in memory - they could be a significant security risk - for example changing some bytes loaded at PRUSS startup could be used to take over the BBB). That is until today (see my recent post), where some input connections to the header that we want to use as PRUSS inputs is causing the BBB to freeze at boot. Generally, however, the PRUSS's seem to work as expected (make sure you assemble with -V2)

[William Hermans]

(the PRUSS's can write anywhere in memory - they could be a significant security risk - for example changing some bytes loaded at PRUSS startup could be used to take over the BBB).

Only if you're incompetent where system security is concerned. 

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