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-15886-138392135...@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
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de
"If you own a machine, you are in turn owned by it, and spend your
time serving it..." - Marion Zimmer Bradley, _The Forbidden Tower_
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