Dear "Saridakis, Dean (US SSA)",
please keep the ML on Cc:, and please do not top-post / full quote. Finally, please keep your line length < 70 characters. Thanks.
In message cmu-lmtpd-15886-1383921355-5@frontend1.mail.m-online.net you wrote:
Figured I'd ask. FWIW, I have no intention of number crunching in U-Boot, but do need to do 64-bit store operations. Being able to do a stfd on PowerPC can be very handy, but MSR[FE] must be set.
...
hard-float in my system. Is this a general enough need that it'd make sense to have a CONFIG_SYS_HARD_FLOAT to enable this option?
This makes no sense. U-Boot does not use any FP operations at all.
I made a quick update for mpc85xx (guarded by CONFIG_SYS_HARD_FLOAT) and I seem to be running fine.
U-Boot does not (and will not) support FP. If you want to do number crunching, then start an OS.
Agreed. Usually we solve this by using dedicated assembler code. See for example board/cu824/flash.c, board/cpc45/flash.c, or board/ppmc7xx/flash.c:
static void write_via_fpu(vu_long *addr, ulong *data) { __asm__ __volatile__ ("lfd 1, 0(%0)" : : "r" (data)); __asm__ __volatile__ ("stfd 1, 0(%0)" : : "r" (addr)); }
No need for any FP support in the tool chain...
Best regards,
Wolfgang Denk