From: "Maciej W. Rozycki" <macro@imgtec.com>
To: <Paul_Koning@Dell.com>
Cc: Ralf Baechle <ralf@linux-mips.org>, <ANDY.KENNEDY@adtran.com>,
<binutils@sourceware.org>
Subject: Re: ABI, I don't get it...
Date: Wed, 24 Aug 2016 15:46:00 -0000 [thread overview]
Message-ID: <alpine.DEB.2.00.1608241630360.4471@tp.orcam.me.uk> (raw)
In-Reply-To: <9FEF6E54-6E69-4D3A-BF71-7FC779B1F4EE@dell.com>
On Sun, 14 Aug 2016, Paul_Koning@Dell.com wrote:
> > with a toolchain that was supposedly 64-bit native, hard-float. Why
> > the floating point selection is soft, I cannot say.
>
> Perhaps because some other MIPS64 machines don't have float? The
> Sibyte series comes to mind. We use soft-float for that reason, even
> though XLR and XLP do have it.
FYI, the SiByte/Broadcom SB-1 processor cores do have an FPU albeit IIRC
early (A0?) steppings had fatal errata making the unit less than usable
(they also had other issues making them usable even less). This may have
been the reason you have chosen a software configuration which avoids the
use of the FPU with these processors. Later revisions were fine. I've
used the FPU with a B2 stepping SB-1 myself with no issues; there was a
later C0 revision as well.
Ralf (cc-ed) may remember a bit more about the story here.
FWIW,
Maciej
next prev parent reply other threads:[~2016-08-24 15:46 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-12 22:47 ANDY KENNEDY
2016-08-14 16:03 ` Paul_Koning
2016-08-24 15:46 ` Maciej W. Rozycki [this message]
2016-08-24 15:53 ` Paul_Koning
2016-08-24 22:55 ` ANDY KENNEDY
2016-08-24 23:08 ` Maciej W. Rozycki
2016-08-25 0:01 ` Andrew Pinski
2016-08-15 18:51 ` Maciej W. Rozycki
2016-08-24 15:21 ` Matthew Fortune
2016-08-24 22:52 ` ANDY KENNEDY
2016-08-24 22:59 ` Maciej W. Rozycki
2016-08-24 22:53 ` Maciej W. Rozycki
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