# Raspberry Pi failed to open vchiq instance problem

**URL:** <https://linux-tips.com/t/raspberry-pi-failed-to-open-vchiq-instance-problem/279>\
**Category:** Programming\
**Created:** [September 21, 2015, 9:50am UTC](https://linux-tips.com/t/raspberry-pi-failed-to-open-vchiq-instance-problem/279 "2015-09-21T09:50:17Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![saucompeng](https://linux-tips.com/user_avatar/linux-tips.com/saucompeng/32/176_2.png) [@saucompeng](https://linux-tips.com/u/saucompeng)\
**Post date:** [September 21, 2015, 9:50am UTC](https://linux-tips.com/t/raspberry-pi-failed-to-open-vchiq-instance-problem/279/1 "2015-09-21T09:50:17Z")

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Hi;

I created an image for Raspberry Pi with Buildroot and include Qt5 in image. I added Eglfs support. When I want to start Gui program [`./try1 -qws`] , `giving error : failed to open vchiq instance`

I looked with strace [`strace ./try1 -qws`] , At the output : `open("/dev/vchiq ", O_RDWR....) =-1 ENOENT ( No such file or directory )`

What is wrong ?

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**Author:** ![demirten](https://linux-tips.com/user_avatar/linux-tips.com/demirten/32/64_2.png) [@demirten](https://linux-tips.com/u/demirten)\
**Post date:** [September 21, 2015, 11:18am UTC](https://linux-tips.com/t/raspberry-pi-failed-to-open-vchiq-instance-problem/279/2 "2015-09-21T11:18:58Z")

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VCHIQ is the name of the Raspberry Video Core IV GPU kernel driver.

![](https://linux-tips.com/uploads/default/original/1X/b614834c16c0f848fb28546a60d56ed08ec9f48a.png)

It seems that your kernel doesn’t have vchiq driver.

It is good to use a patched-buildroot system which is customized specially for Raspberry boards. You can use following buildroot repo:

> **[GitHub - gamaral/rpi-buildroot: Buildroot overlay with a few personal tweaks...](https://github.com/gamaral/rpi-buildroot)**
>
> Buildroot overlay with a few personal tweaks for the Raspberry Pi - GitHub - gamaral/rpi-buildroot: Buildroot overlay with a few personal tweaks for the Raspberry Pi

It is also good to read this first: [Raspberry Pi VideoCore APIs - eLinux.org](http://elinux.org/Raspberry_Pi_VideoCore_APIs)

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<div class="post-metadata">

**Author:** ![saucompeng](https://linux-tips.com/user_avatar/linux-tips.com/saucompeng/32/176_2.png) [@saucompeng](https://linux-tips.com/u/saucompeng)\
**Post date:** [September 23, 2015, 8:28pm UTC](https://linux-tips.com/t/raspberry-pi-failed-to-open-vchiq-instance-problem/279/3 "2015-09-23T20:28:08Z")

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Problem is at [https://github.com/raspberrypi/linux](https://github.com/raspberrypi/linux) last branch. I found it , problem is about Kconfig. I cloned rpi-4.0.y , Qt5 is working good now.