Fixes <https://issues.guix.gnu.org/64745>.
The regression was introduced in
ed5dc3a25d858a394bb7db937a51d866c3cdc6ed: at the top level,
bootloaders.scm and firmware.scm would depend on each other, leading to
unbound variables when loaded, depending on the order in which they got
loaded.
* gnu/packages/bootloaders.scm (make-u-boot-sunxi64-package): Expect
'scp-firmware' to be a promise; force it in 'native-inputs'.
(u-boot-pine64-plus, u-boot-pine64-lts, u-boot-pinebook): Wrap the 3rd
argument to 'make-u-boot-sunxi64-package' into 'delay'.
Reported-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
0ab46ef3f9