I'm by no means an ARM assembler expert, but I am working with the iMX6 Platform SDK and just noticed that the assembler function enable_neon_fpu (copied below, extracted from iMX6_Platform_SDK/sdk/core/src/cortexA9.s) appears to be missing a return...
/* set NSACR, both Secure and Non-secure access are allowed to NEON */
MRC p15, 0, r0, c1, c1, 2
ORR r0, r0, #(0x3<<10) @ enable fpu/neon
MCR p15, 0, r0, c1, c1, 2
/* Set the CPACR for access to CP10 and CP11*/
LDR r0, =0xF00000
MCR p15, 0, r0, c1, c0, 2
/* Set the FPEXC EN bit to enable the FPU */
MOV r3, #0x40000000
@VMSR FPEXC, r3
MCR p10, 7, r3, c8, c0, 0
Can someone verify this?