JetPack 5.1.3(35.5.0)，PPS时间间隔异常

[wangliyong]

您好！
我有3个批次的orin开发套件。前两个批次的分别安装过35.1.0和35.3.1, pps都是正常的。最近新买了一些orin开发套件，安装了35.5.0，我发现pps的时间间隔差别比较大。正常的时间差应该是1.0000xxx,而它是1.02xxx,请问这个是什么问题呢。(gps模块的设置都是一样的)

pps的添加步骤都是一样的：
https://docs.nvidia.com/jetson/archives/r35.3.1/DeveloperGuide/text/SD/Kernel/KernelCustomization.html
1.$TEGRA_KERNEL_SOURCE/kernel/kernel-5.10/arch/arm64/configs/tegra_defconfig
CONFIG_PPS=y
CONFIG_PPS_CLIENT_GPIO=y

$TEGRA_KERNEL_SOURCE/hardware/nvidia/platform/t23x/concord/kernel-dts/tegra234-p3701-0000-p3737-0000.dts
pps {
compatible = “pps-gpio”;
assert-rising-edge;
gpios = <&tegra_main_gpio TEGRA234_MAIN_GPIO(Q, 6) GPIO_ACTIVE_HIGH>;
status = “okay”;
echo-active-ms = <1>;
};

$TEGRA_KERNEL_SOURCE/kernel/kernel-5.10/drivers/pps/clients/pps-gpio.c
ret = pps_gpio_setup(pdev);
if (ret)
return ret;//-EINVAL;

正确的截图：

错误的截图：

[KevinFFF]

Hi wangliyong,

Could you help to do some cross validations to clarify what causes the issue?

1. Orin devkit board? (old and new)
2. L4T release? (r35.3.1 and r35.5.0)
3. GPU module? (old and new)

Please also share the result of the following command on your AGX Orin devkit.

$ cat /etc/nv_boot_control.conf

[wangliyong]

thank you for replay.
1.yes，both are Orin devkit board.
2.yes，old orin is r35.3.1,new orin is r35.5.0
3.how to find？

cmd result:
new orin:

old orin:

[KevinFFF]

@wangliyong

new orin:

It is SKU5. Could you use SDKM to flash it R35.3.1 and check if you could get the expected result?

@wangliyong

old orin:

It is SKU0. Could you use SDKM to flash it R35.5.0 and check if you could reproduce the issue?

@wangliyong

.how to find？

Do you have only one GPS module to get PPS signal?
If not, please help to confirm if they have the exact same behavior.

[wangliyong]

SKU5, the default system is R35.4.1. I cannot flash to R35.3.1. My SDKM is 1.9.3 or 2.0.*, I cannot find jetson 5.1.1.

SKU0, I will check it later.

I test new orin & R35.5.0 with 2 GPS modules, the result not correct.

====================================================
I flash new orin R35.4.1. The pps time looks right.

[WayneWWW]

My SDKM is 1.9.3 or 2.0.*, I cannot find jetson 5.1.1.

Please read below and you will be able to install.

Help, I Can't find jetpack 5.1.1 in sdkmanager,

run sdkmanager with --archived-versions parameters

[wangliyong]

Thank you very much.
I need install 5.1.1
sdkmanager --archived-versions