Re: floating point operation of ppc

Eugene Surovegin wrote:

On Fri, Nov 11, 2005 at 07:51:31AM -0500, Greg Weeks wrote:
 

quoted

lily wrote:

   

quoted

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.
   

Are you sure it was 405ep? There is no floating point errata for this chip due to the simple reason, it doesn't support floating point in hardware at all.

You probably confusing it with 440ep.

 

You're right. It was the 440ep. The 405ep BSP is using the 4xx toolchain. I don't think I've ever tried the math emulator on a 405.


Greg Weeks