How to get IEEE 1588 1PPS on iMX6ULL?

Technical Support
,
#1

Good morning
we need to get out IEEE 1588 1PPS on iMX6ULL in order to connect it to our data acquisition system. we are interested in having a PPS with an accuracy up to 100 us. Currently we can synchronize via PTP protocol our module iMX6ULL with Linux image BSP 5.7.0 version

#2

Hi @idir !

Sorry for the delay.

Could you please share more information about the setup you are using?

  • Which exact Colibri iMX6ULL are you using? Please share its full name and version
  • Are you building your image using Yocto and BSP 5.7? Or TorizonCore 5.7?
  • Are you using an upstream or downstream based kernel?

Best regards,

#3

Hi @henrique.tx ,
i am using Colibri iMX6ULL 512MB IT V1.1 A, with BSP 5.7.0 image builded using Yocto and upstream based kernel

#4

Hi @idir !

We have the kernel configurations related to IEEE1588 and PPS already enabled by default, as seen below:

root@colibri-imx6ull-emmc-07201242:~# cat /etc/os-release
ID=tdx-xwayland-upstream
NAME="TDX Wayland with XWayland Upstream"
VERSION="5.7.0+build.20 (dunfell)"
VERSION_ID=5.7.0-build.20
PRETTY_NAME="TDX Wayland with XWayland Upstream 5.7.0+build.20 (dunfell)"
DISTRO_CODENAME="dunfell"

root@colibri-imx6ull-emmc-07201242:~# zcat /proc/config.gz | grep -iE "1588|ptp|pps"
CONFIG_HAVE_OPTPROBES=y
CONFIG_NET_PTP_CLASSIFY=y
CONFIG_NF_CONNTRACK_PPTP=m
CONFIG_NF_NAT_PPTP=m
# CONFIG_PPTP is not set
CONFIG_PPS=y
# CONFIG_PPS_DEBUG is not set
# PPS clients support
# CONFIG_PPS_CLIENT_KTIMER is not set
CONFIG_PPS_CLIENT_LDISC=y
CONFIG_PPS_CLIENT_GPIO=y
# PPS generators support
# PTP clock support
CONFIG_PTP_1588_CLOCK=y
# end of PTP clock support

To activate the PPS, you can refer to this solved question from NXP’s forum: Solved: How to get IEEE 1588 1PPS on i.MX6Q? - NXP Community

The ptp4l command there comes from NXP’s i.MX Linux Reference Manual, downloadable from Embedded Linux for i.MX Applications Processors | NXP Semiconductors. For BSP 5, please access the “Documentation” link from “Linux 5.4.70_2.3.0” release. The section “ENET IEEE-1588” will be helpful for you. You will need to create an account to download it.

Let us know if this helps you.

Best regards,

#5

Hi @henrique.tx
thank you for your answer, I checked our iMX6ULL, indeed, it has same configurations as yours with EEE1588 and PPS enabled and I can also sync it with PTP using the ptp4l command, but I still can’t enable PPS output on GPIO. I have read the documentation that you have indicated to me however honestly I struggle to understand which file tds I have to modify and which string I have to add in it for iMX6ULL , I will be grateful if you give me some hints about it