If I enable x32 for intel-corei7-64 with DEFAULTTUNE = "x86-64-x32": $ bitbake core-image-sato ERROR: Nothing PROVIDES 'virtual/kernel' ERROR: linux-yocto-rt PROVIDES virtual/kernel but was skipped: incompatible with machine intel-corei7-64 (not in COMPATIBLE_MACHINE) ERROR: linux-yocto PROVIDES virtual/kernel but was skipped: incompatible with machine intel-corei7-64 (not in COMPATIBLE_MACHINE) ERROR: linux-yocto-dev PROVIDES virtual/kernel but was skipped: incompatible with machine intel-corei7-64 (not in COMPATIBLE_MACHINE) ERROR: linux-yocto-tiny PROVIDES virtual/kernel but was skipped: incompatible with machine intel-corei7-64 (not in COMPATIBLE_MACHINE) ERROR: linux-yocto PROVIDES virtual/kernel but was skipped: incompatible with machine intel-corei7-64 (not in COMPATIBLE_MACHINE) ERROR: linux-yocto-rt PROVIDES virtual/kernel but was skipped: incompatible with machine intel-corei7-64 (not in COMPATIBLE_MACHINE) ERROR: linux-dummy PROVIDES virtual/kernel but was skipped: PREFERRED_PROVIDER_virtual/kernel set to linux-yocto, not linux-dummy ERROR: linux-yocto-tiny PROVIDES virtual/kernel but was skipped: incompatible with machine intel-corei7-64 (not in COMPATIBLE_MACHINE) ERROR: linux-yocto PROVIDES virtual/kernel but was skipped: incompatible with machine intel-corei7-64 (not in COMPATIBLE_MACHINE) ERROR: linux-yocto-tiny PROVIDES virtual/kernel but was skipped: incompatible with machine intel-corei7-64 (not in COMPATIBLE_MACHINE) ERROR: linux-yocto-rt PROVIDES virtual/kernel but was skipped: incompatible with machine intel-corei7-64 (not in COMPATIBLE_MACHINE) ERROR: Required build target 'core-image-sato' has no buildable providers. Missing or unbuildable dependency chain was: ['core-image-sato', 'virtual/kernel']
There are other bugs that have been opened to replace this one that are more specific. x32 is down to a small handful of reported failures.