# Variscite DART-6UL: U-boot integration succeeds with Yocto Sumo, but fails with Thud

**URL:** <https://hub.mender.io/t/variscite-dart-6ul-u-boot-integration-succeeds-with-yocto-sumo-but-fails-with-thud/2288>\
**Category:** General Discussions\
**Tags:** yocto, thud\
**Created:** [August 6, 2020, 12:52pm UTC](https://hub.mender.io/t/variscite-dart-6ul-u-boot-integration-succeeds-with-yocto-sumo-but-fails-with-thud/2288 "2020-08-06T12:52:31Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![miklosj](https://avatars.discourse-cdn.com/v4/letter/m/71e660/32.png) [@miklosj](https://hub.mender.io/u/miklosj)\
**Post date:** [August 13, 2020, 2:30pm UTC](https://hub.mender.io/t/variscite-dart-6ul-u-boot-integration-succeeds-with-yocto-sumo-but-fails-with-thud/2288/11 "2020-08-13T14:30:42Z")

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It turned out that the U-boot configuration fails only if I use the eMMC template instead of the SD card template from ` meta-mender-community/mender-variscite/templates` to create my local.conf file. With the SD-card template, the U-boot patching didn’t yield any errors, and I was able to build a working Thud-based SD card image.

In the meantime, I’ve come across a topic on this matter:  
[How to write DART-6UL image to eMMC](https://hub.mender.io/t/how-to-write-dart-6ul-image-to-emmc/1112)

I don’t really understand how the original poster got the eMMC booting to work, but it seems that he may have used a local.conf initially tailored to SD-card booting, with a few changes made to the MENDER\_STORAGE\_DEVICE and MENDER\_STORAGE\_TOTAL\_SIZE\_MB variables to boot from eMMC.

Does this procedure make sense, or am I missing out something?

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_[View the full topic](https://hub.mender.io/t/variscite-dart-6ul-u-boot-integration-succeeds-with-yocto-sumo-but-fails-with-thud/2288)._