Custom board built board with Atmel's at91sam9261 processor (little endian). We can go either way with FPA/VFP.
Two things perplex me here: 1) buildroot (as of r21760 that I'm working with) seems to want to use FPA when I compile . I'm surprised that more attention is not paid to this in an explicit manner. 2) Under what criteria should one favor FPA or VFP? Things that come to mind: pure speed, power efficiency, binary compatibility with x86, binary compatibility with traditional ARM. Additionally and perhaps more importantly, it appears that the confusion stems from two known gcc errors: http://www.busybox.net/cgi-bin/viewcvs.cgi/branches/buildroot.mjn3/toolchain/gcc/3.4.6/arm-softfloat.patch.conditional?rev=14854&view=auto http://bugs.uclibc.org/view.php?id=1522 Based on my understanding of the above two posts, in gcc 3.4.6 using -msoft_float erroneously gives you VFP while in gcc 4.2.6 using -msoft_float correctly gives you FPA. Additionally in gcc 4.2.6 if you want VFP, one should be able to omit any reference to -msoft-float, etc and that should give you VFP. Unfortuantely due to an error in gcc 4.2.6 omitting any such configuration gives you FPA. The latter bug did not impact us but it's good to be aware of. Perhaps uclibc and buildroot should take this into consideration and specify gcc configure options more explicitly? -Chris _______________________________________________ uClibc mailing list [email protected] http://busybox.net/cgi-bin/mailman/listinfo/uclibc
