andy pugh wrote: > On 20 July 2012 17:31, Jon Elson <[email protected]> wrote: > > >> There is no hardware floating point. I think that would be a major killer. >> Software emulation is slow, but the typical RT package probably does not >> support the FP emulation for real time kernel modules. >> > > FPU support is optional in the RTAI config. But I don't know what you > get if you turn it off. > The original Pi docs said the HARDWARE did not have floating point instructions. This may have been wrong, or they have moved to a different ARM chip. The low-end ARMs still do not have FP hardware, and do it by emulation.
The base thread of LinuxCNC does not support FP instructions, this speeds up context switches and is why the latency is usually better on the base thread than the servo thread. But, I'm quite sure if you perform an FP instruction in the base thread, you will get an exception. Jon ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
