william@bad:~/poky/build$ bitbake core-image-minimal
Loading cache: 100% |############################################| Time: 0:00:00
Loaded 1300 entries from dependency cache.
NOTE: Resolving any missing task queue dependencies
NOTE: preferred version v2017.03% of u-boot not available (for item virtual/bootloader)
NOTE: versions of u-boot available: 1:2017.01
ERROR: Nothing PROVIDES 'virtual/kernel'
ERROR: linux-yocto-dev PROVIDES virtual/kernel but was skipped: incompatible with machine orange-pi-zero (not in COMPATIBLE_MACHINE)
ERROR: linux-yocto PROVIDES virtual/kernel but was skipped: incompatible with machine orange-pi-zero (not in COMPATIBLE_MACHINE)
ERROR: linux-yocto PROVIDES virtual/kernel but was skipped: incompatible with machine orange-pi-zero (not in COMPATIBLE_MACHINE)
ERROR: linux-yocto-rt PROVIDES virtual/kernel but was skipped: incompatible with machine orange-pi-zero (not in COMPATIBLE_MACHINE)
ERROR: linux-yocto-rt PROVIDES virtual/kernel but was skipped: incompatible with machine orange-pi-zero (not in COMPATIBLE_MACHINE)
ERROR: linux-dummy PROVIDES virtual/kernel but was skipped: PREFERRED_PROVIDER_virtual/kernel set to linux, not linux-dummy
ERROR: linux-yocto-tiny PROVIDES virtual/kernel but was skipped: incompatible with machine orange-pi-zero (not in COMPATIBLE_MACHINE)
ERROR: linux-yocto-rt PROVIDES virtual/kernel but was skipped: incompatible with machine orange-pi-zero (not in COMPATIBLE_MACHINE)
ERROR: linux-yocto-tiny PROVIDES virtual/kernel but was skipped: incompatible with machine orange-pi-zero (not in COMPATIBLE_MACHINE)
ERROR: linux-yocto PROVIDES virtual/kernel but was skipped: incompatible with machine orange-pi-zero (not in COMPATIBLE_MACHINE)
ERROR: linux-yocto-tiny PROVIDES virtual/kernel but was skipped: incompatible with machine orange-pi-zero (not in COMPATIBLE_MACHINE)
ERROR: linux-yocto PROVIDES virtual/kernel but was skipped: incompatible with machine orange-pi-zero (not in COMPATIBLE_MACHINE)
ERROR: linux-yocto-rt PROVIDES virtual/kernel but was skipped: incompatible with machine orange-pi-zero (not in COMPATIBLE_MACHINE)
ERROR: linux-yocto-tiny PROVIDES virtual/kernel but was skipped: incompatible with machine orange-pi-zero (not in COMPATIBLE_MACHINE)
ERROR: Required build target 'core-image-minimal' has no buildable providers.
Missing or unbuildable dependency chain was: ['core-image-minimal', 'virtual/kernel']

Summary: There were 2 ERROR messages shown, returning a non-zero exit code.
william@bad:~/poky/build$