Source
For some CPU cores, the NEON SIMD extension is optional.
# arm cpu features
config BR2_ARM_CPU_HAS_NEON
bool
# for some cores, NEON support is optional
config BR2_ARM_CPU_MAYBE_HAS_NEON
bool
choice
prompt "Target Architecture Variant"
depends on BR2_arm || BR2_armeb
default BR2_arm926t
help
Specific CPU variant to use
config BR2_arm7tdmi
bool "arm7tdmi"
config BR2_arm720t
bool "arm720t"
config BR2_arm920t
bool "arm920t"
config BR2_arm922t
bool "arm922t"
config BR2_arm926t
bool "arm926t"
config BR2_arm10t
bool "arm10t"
config BR2_arm1136jf_s_r0
bool "arm1136jf_s rev0"
config BR2_arm1136jf_s_r1
bool "arm1136jf_s rev1"
config BR2_arm1176jz_s
bool "arm1176jz-s"
config BR2_arm1176jzf_s
bool "arm1176jzf-s"
config BR2_cortex_a5
bool "cortex-A5"
select BR2_ARM_CPU_MAYBE_HAS_NEON
config BR2_cortex_a8
bool "cortex-A8"
select BR2_ARM_CPU_HAS_NEON
config BR2_cortex_a9
bool "cortex-A9"
select BR2_ARM_CPU_MAYBE_HAS_NEON
config BR2_cortex_a15
bool "cortex-A15"
select BR2_ARM_CPU_HAS_NEON
config BR2_fa526
bool "fa526/626"
config BR2_pj4
bool "pj4"
config BR2_strongarm
bool "strongarm sa110/sa1100"
config BR2_xscale
bool "xscale"
config BR2_iwmmxt
bool "iwmmxt"
endchoice
config BR2_arm1136jf_s
bool
default BR2_arm1136jf_s_r0 || BR2_arm1136jf_s_r1