feature-arm-thumb.inc cleanups

index 5632171..0a9545c 100644
@@ -1,9 +1,3 @@
-# The instruction set the compiler should use when generating application
-# code. The kernel is always compiled with arm code at present. arm code
-# is the original 32 bit ARM instruction set, thumb code is the 16 bit
-# encoded RISC sub-set. Thumb code is smaller (maybe 70% of the ARM size)
-# but requires more instructions (140% for 70% smaller code) so may be
-# slower.
 TUNEVALID[thumb] = "Use thumb instructions instead of ARM"
 ARM_THUMB_OPT = "${@['arm', 'thumb'][d.getVar('ARM_INSTRUCTION_SET', True) == 'thumb']}"
 ARM_THUMB_SUFFIX .= "${@bb.utils.contains('TUNE_FEATURES', 'armv4',  't',  '', d)}"

index 0a9545c..fb22977 100644
@@ -24,7 +24,6 @@ python () {
 }
 
 TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', ' -m${ARM_M_OPT}', '', d)}"
-OVERRIDES .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', ':thumb', '', d)}"
 
 # Add suffix from ARM_THUMB_SUFFIX only if after all this we still set ARM_M_OPT to thumb
 ARMPKGSFX_THUMB .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', '${ARM_THUMB_SUFFIX}', '', d) if d.getVar('ARM_M_OPT', True) == 'thumb' else ''}"

@@ -35,9 +34,7 @@ ARMPKGSFX_THUMB .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', '${ARM_THUMB_
 # turn this off - the actual cost is very small.
 TUNEVALID[no-thumb-interwork] = "Disable mixing of thumb and ARM functions"
 THUMB_TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'no-thumb-interwork', ' -mno-thumb-interwork', ' -mthumb-interwork', d)}"
-THUMB_OVERRIDES .= "${@bb.utils.contains('TUNE_FEATURES', 'no-thumb-interwork', ':thumb-interwork', '', d)}"
 TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', ' ${THUMB_TUNE_CCARGS}', '', d)}"
-OVERRIDES .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', '${THUMB_OVERRIDES}', '', d)}"
 
 # what about armv7m devices which don't support -marm (e.g. Cortex-M3)?
 TARGET_CC_KERNEL_ARCH += "${@bb.utils.contains('TUNE_FEATURES', 'thumb', '-mno-thumb-interwork -marm', '', d)}"

index fb22977..0c32210 100644
@@ -28,13 +28,5 @@ TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', ' -m${ARM_M_OPT}'
 # Add suffix from ARM_THUMB_SUFFIX only if after all this we still set ARM_M_OPT to thumb
 ARMPKGSFX_THUMB .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', '${ARM_THUMB_SUFFIX}', '', d) if d.getVar('ARM_M_OPT', True) == 'thumb' else ''}"
 
-# Whether to compile with code to allow interworking between the two
-# instruction sets. This allows thumb code to be executed on a primarily
-# arm system and vice versa. It is strongly recommended that DISTROs not
-# turn this off - the actual cost is very small.
-TUNEVALID[no-thumb-interwork] = "Disable mixing of thumb and ARM functions"
-THUMB_TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'no-thumb-interwork', ' -mno-thumb-interwork', ' -mthumb-interwork', d)}"
-TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', ' ${THUMB_TUNE_CCARGS}', '', d)}"
-
 # what about armv7m devices which don't support -marm (e.g. Cortex-M3)?
 TARGET_CC_KERNEL_ARCH += "${@bb.utils.contains('TUNE_FEATURES', 'thumb', '-mno-thumb-interwork -marm', '', d)}"