# Patch for enabling PCIE 12V and 3.3V **URL:** \ **Category:** Jetson AGX Orin\ **Tags:** pcie\ **Created:** [June 28, 2022, 6:50pm UTC](https://forums.developer.nvidia.com/t/patch-for-enabling-pcie-12v-and-3-3v/219102 "2022-06-28T18:50:43Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![dv6386](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@dv6386](https://forums.developer.nvidia.com/u/dv6386)\ **Post date:** [June 28, 2022, 6:50pm UTC](https://forums.developer.nvidia.com/t/patch-for-enabling-pcie-12v-and-3-3v/219102/1 "2022-06-28T18:50:44Z")
Hello! I am trying to make the PCIE AS3142 USB 3.2 expansion card to work on Jetson ORIN. While searching for clues I have stumbled upon the threads that say that there is a problem with power and that a patch is available for enabling the required 12V and 3.3V regulator. > [@Jetson AGX Orin development kit PCIe power limit](https://forums.developer.nvidia.com/t/jetson-agx-orin-development-kit-pcie-power-limit/213869/14): > > I checked the documentation “[NVIDIA Jetson AGX Orin Developer Kit Carrier Board Specification](https://developer.nvidia.com/assets/embedded/secure/jetson/agx_orin/jetson_agx_orin_devkit_carrier_board_specification_sp-10900-001_v1.0.pdf)” for the PCIe power limit: on page 43, Table 6-2 “Interface Supply Current Capabilities” shows max current of 5.5 A at 12 V for PCIe connector on the same page, Table 6-3 “Supply Current Capabilities per Connector per Supply” shows only 3A at 12V for the PCIe connector. Why is the current limited to only 3 A on the PCIe connector if the 12 V rail (NCP81599 DC-DC) is capable to deliver 5.5 A output?… > [@PCIe x16 supply not enabled on Development Kit](https://forums.developer.nvidia.com/t/pcie-x16-supply-not-enabled-on-development-kit/214927): > > Hello, I’m trying to use a PCIe card with the AGX Orin Developer Kit. The problem is that the 3.3V and 12V power supplies are not enabled after inserting a card. Only the 3V3AUX supply is active. Now, I was able to enable the power supplies by updating the device tree file tegra234-p3737-fixed-regulator.dtsi as follows: remove the flag “regulator-boot-on” for the nodes p3737\_vdd\_3v3\_pcie and p3737\_vdd\_12v\_pcie p3737\_vdd\_3v3\_pcie: change the gpio pin value to TEGRA234\_MAIN\_GPIO(H, 4) Is … Since I am new to the Jetson family and I am a competent beginner in Linux at best I don’t really know how to apply the provided patch or compile my own kernel. How can I do this? My efforts in googling were fruitless, I didn’t find any good tutorials or procedures on how to accomplish this. Thank you in advance! ---
**Author:** ![kayccc](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/kayccc/32/14043_2.png) [@kayccc](https://forums.developer.nvidia.com/u/kayccc)\ **Post date:** [June 28, 2022, 11:27pm UTC](https://forums.developer.nvidia.com/t/patch-for-enabling-pcie-12v-and-3-3v/219102/2 "2022-06-28T23:27:53Z")
Please refer to [How to Apply a Patch to a File (and Create Patches) in Linux (howtogeek.com)](https://www.howtogeek.com/415442/how-to-apply-a-patch-to-a-file-and-create-patches-in-linux/) ---
**Author:** ![system](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/system/32/68080_2.png) [@system](https://forums.developer.nvidia.com/u/system)\ **Post date:** [July 12, 2022, 11:27pm UTC](https://forums.developer.nvidia.com/t/patch-for-enabling-pcie-12v-and-3-3v/219102/3 "2022-07-12T23:27:55Z")
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