Hi Everyone.
I'm collecting information to get even faster boot times,
I have 2 questions.
It is written that it is possible to boot from MMC (8bit mode) (18.1.1
MMCHS Features) using MMC mode with TRM of am335x.
- Clock support
-96-MHz functional clock source input
-up to 384Mbit/sec
On Wed, 17 Feb 2021 10:45:49 -0800 (PST), in
gmane.comp.hardware.beagleboard.user Walter Cromer
wrote:
>You are correct that this application does not need to know the actual real
>time but only the relative (elapsed) time since the subroutine began. I'm
>familiar with clock_gettime but
I fired up the Beagle at home it the PRU works out of the box.
What do you get running
*ls /dev/remoteproc*
I get:
*ls -ls /dev/remoteproc*
total 0
0 lrwxrwxrwx 1 root root 33 Feb 17 17:26 pruss-core0 ->
/sys/class/remoteproc/remoteproc1
0 lrwxrwxrwx 1 root root 33 Feb 17 17:26 pruss-core1 ->
I'll get this one onto an SD card and give it a try. If I can just get
this configured I think I can make quick work of this problem!
On Wednesday, February 17, 2021 at 3:47:04 PM UTC-5 Mark A. Yoder wrote:
> Good point, it should work I'm running a newer test image[1], but I
> took
Good point, it should work I'm running a newer test image[1], but I
took my Beagle home so I can't do a quick check on it until later.
--Mark
[1]https://rcn-ee.com/rootfs/bb.org/testing/2021-02-15/buster-iot/bone-debian-10.8-iot-armhf-2021-02-15-4gb.img.xz
On Wednesday, February 17,
I asked because the ones on the page @ the link are older than the one I
have installed.
On Wednesday, February 17, 2021 at 2:30:58 PM UTC-5 Mark A. Yoder wrote:
> On newer versions of the SD card image /var/lib/cloud9 is a git repo which
> you can do a git pull to update. Your version is
So you are saying that this version is too old?
Linux beaglebone 4.14.108-ti-r137 #1stretch SMP PREEMPT *Tue Aug 25
01:48:39 UTC 2020* armv7l GNU/Linux
On Wednesday, February 17, 2021 at 2:30:58 PM UTC-5 Mark A. Yoder wrote:
> On newer versions of the SD card image /var/lib/cloud9 is a git
On newer versions of the SD card image /var/lib/cloud9 is a git repo which
you can do a git pull to update. Your version is too old.
Follow the instructions
at:
https://markayoder.github.io/PRUCookbook/02start/start.html#_installing_the_latest_os_on_your_bone
to download and install an
Mark,
git pull on /var/lib/cloud9 fails with 'fatal: Not a git repository (or any
of the parent directories): .git
I'm such a neophyte on git. What do I need to do?
And, what do you mean by updating to a new version of the SD card? The OS
is booting from the SD card and the version.sh
I suggest updating to a new version of the SD card. It looks like the PRUs
are getting started at boot time, but the path isn't setup right. I think
we setup some links so the path* /dev/remoteproc/pruss-core0/state *points
to the right place.
You could also try:
*cd */var/lib/cloud9
*git*
Mark,
I got the latest PRUCookbook downloaded and when trying to make the
hello.pru0.c program in 1.6, I got this error.
*debian@beaglebone:/var/lib/cloud9/PRUCookbook/docs/02start/code$ make
TARGET=hello.pru0*
*/var/lib/cloud9/common/Makefile:29:
You are correct that this application does not need to know the actual real
time but only the relative (elapsed) time since the subroutine began. I'm
familiar with clock_gettime but didn't think it could give me subsecond
information. I'll explore it!
Thanks,!
Walter
On Wednesday, February
Hi Walter,
I don't think you need an RTC for relative time. clock_gettime should do
the job (https://linux.die.net/man/3/clock_gettime)
There are also more intuitive ways to manipulate timespec structs in the
RCL (http://strawsondesign.com/docs/librobotcontrol/group__time.html).
Best,
Michele
I really don't need ns. The valve 'on time' is going to be in the range of
500 ms to 2 seconds probably.
I will review the PRUCookbook! Thanks!
Walter
On Wednesday, February 17, 2021 at 10:10:53 AM UTC-5 Mark A. Yoder wrote:
> The PRUs can give you 10's of ns timing, which is more than
The PRUs can give you 10's of ns timing, which is more than good enough for
milliseconds, but might be over kill.
I'd think using C on the ARM processor should be fast enough. I'd use
gpiod[1].
If you really want the ns timing of the PRUs, check out the PRU Cookbook[2]
--Mark
[1]
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