# Building Custom yocto image for WP8548

**URL:** <https://mangoh.discourse.group/t/building-custom-yocto-image-for-wp8548/945>\
**Category:** mangOH Green\
**Created:** [November 29, 2017, 7:14am UTC](https://mangoh.discourse.group/t/building-custom-yocto-image-for-wp8548/945 "2017-11-29T07:14:16Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Sathisha](https://avatars.discourse-cdn.com/v4/letter/s/47e85d/32.png) [@Sathisha](https://mangoh.discourse.group/u/Sathisha)\
**Post date:** [November 29, 2017, 7:14am UTC](https://mangoh.discourse.group/t/building-custom-yocto-image-for-wp8548/945/1 "2017-11-29T07:14:16Z")

</div>

Hi,

I have built yocto image successfully. And I am trying to flash kernel and rootfs using fastboot but while flashing rootfs getting following error

unknown partition 'rootfs’  
error: cannot determine image filename for ‘rootfs’

I have flashed kernel image successfully.  
kernel linked to boot-yocto-mdm9x15.img  
rootfs linked to mdm9x15-image-minimal-swi-mdm9x15.2k.default

Please help me to flash rootfs.  
If i reboot the system without rootfs, system is itself not booting.