Hi, On Fri, Jun 11, 2010 at 4:06 PM, Jabir M <Jabir_M@xxxxxxxxxxxxxx> wrote: > I am working on a FPU-less 34k MIPS platform with linux-2.6.24 > kernel. After running a Darwin media streaming server on the board > for a while, my oprofile results shows high utilization on > fpu_emulator_cop1Handler() & r4k_wait(). > > wiki page http://www.linux-mips.org/wiki/Floating_point says gcc will > use hard float as default and soft float is best suited model for a > fpu less processor. Could anyone kindly help me in understanding use > of -msoft-float . > Whether I need to compile > > 1. kernel with -msoft-float ? or > 2. Glibc ? or > 3. Application ? or > 4. All the above ? I have fought with this in the past; what you need to do is: - build gcc with softfloat support (mipsel-softfloat-linux-gnu triplet for example), - build a libc with this new compiler, - then rebuild all libraries and apps with you new softfloat toolchain. <plug> I have a working softfloat environment for MIPS32 here at [1], it includes a complete c/c++ toolchain with gcc-4.4.3. It's built for mips32r1, no idea if it is supposed to work with 34k cores. </plug> Best regards, Manuel Lauss [1] http://mlau.at/files/mips32-linux/
