This bug was fixed in the package u-boot - 2021.01+dfsg-3ubuntu6
--------------- u-boot (2021.01+dfsg-3ubuntu6) hirsute; urgency=medium
* Set USE_PREBOOT on unmatched board too (just like unleashed & qemu), otherwise u-boot's fdtfile from itb is not used (i.e. when extlinux.conf does not specify fdtdir). LP: #1923162
-- Dimitri John Ledkov <email address hidden> Tue, 13 Apr 2021 14:52:32 +0100
This bug was fixed in the package u-boot - 2021.01+ dfsg-3ubuntu6
--------------- dfsg-3ubuntu6) hirsute; urgency=medium
u-boot (2021.01+
* Set USE_PREBOOT on unmatched board too (just like unleashed & qemu),
otherwise u-boot's fdtfile from itb is not used (i.e. when
extlinux.conf does not specify fdtdir). LP: #1923162
-- Dimitri John Ledkov <email address hidden> Tue, 13 Apr 2021 14:52:32 +0100