Hello, I'm working on an embedded linux audio device with Allwinner A10/A20 cpu. For this device is very important use the neon cpu resource. I've some questions about kernel and toolchains. 1. To use the neon I need to build the kernel using any particular option or apply any patch? 2. I need to build the linux kernel using arm-linux-gnueabi-xxx or arm-linux-gnueabihf-xxx toolchain? What's the difference? 3. the gcc option -mfloat-abi=hard is applicable to my situation? 4. There is any difference use -mfpu='neon' with arm-linux-gnueabi-xxx or arm-linux-gnueabihf-xxx? Currently, to build my application, I'm using the following gcc flags: -O3 -ffast-math -march=armv7 -mtune=cortex-a8 -mfpu='neon' -funsafe-math-optimizations I'd like to hear some opinions about this, Is this a good setup? What's the risk using -funsafe-math-optimizations? Remarks: * application here is a program that process audio algorithm * currently I'm using a cubieboard 1/2 running a arch linux distro from archlinuxarm.org Regards, Ricardo
