Re: floating point operation of ppc

lily wrote:

hi,all:
i build an embedded linux on powerpc 405ep,i need execute floating
point operation,and i enable "math emulate" option in kernel, i run a
while(1)loop ,in the loop there was floating point expression ,after
test ,i found the while (1) exit because of the floating point
computation,that is the floating point can't execute on ppc
stablely.Is there someone meets the same problems ,please give me some
suggestion,thanks!!!

The 405ep has some errata on floating point use. I didn't work on the
processor so I don't know exactly what they are, but Timesys has a
toolchain just for the 405ep to work around the problem. The other
workaround we've used is much slower and it involved disabling the
hardware floating point unit in the head.s for the 405ep and turning on
the emulator. Just turning on the emulator is insufficient. The Timesys
toolchain isn't the only one out there specifically for the 405ep.

Greg Weeks