# Re build u-boot file and linux kernel

**URL:** <https://discuss.pynq.io/t/re-build-u-boot-file-and-linux-kernel/495>\
**Category:** Support\
**Created:** [September 24, 2019, 10:56am UTC](https://discuss.pynq.io/t/re-build-u-boot-file-and-linux-kernel/495 "2019-09-24T10:56:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![tdf](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/tdf/32/271_2.png) [@tdf](https://discuss.pynq.io/u/tdf)\
**Post date:** [September 24, 2019, 10:56am UTC](https://discuss.pynq.io/t/re-build-u-boot-file-and-linux-kernel/495/1 "2019-09-24T10:56:43Z")

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Hi,

I want to re build boot.bit, uimage and the devicetree. Looking in xilinx repositories i do not find a file named zynq\_pynqz1\_deconfig for example, or a devicetree.dts for pynq.

How can i follow the steps to rebuild the boot partition, or where can i find the files?

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<div class="post-metadata">

**Author:** ![rock](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/rock/32/32_2.png) [@rock](https://discuss.pynq.io/u/rock)\
**Post date:** [October 2, 2019, 12:00am UTC](https://discuss.pynq.io/t/re-build-u-boot-file-and-linux-kernel/495/2 "2019-10-02T00:00:14Z")

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After using the sdbuild flow, you should be able to find the petalinux project in sdbuild/build//petalinux\_project. There you should be able to find everything if you are familiar with petalinux.