From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
To: ptxdist@pengutronix.de
Subject: Re: [ptxdist] Go in ptxdist
Date: Thu, 6 Oct 2016 08:33:32 +0200 [thread overview]
Message-ID: <20161006063332.6emfdkityxiyf3lc@pengutronix.de> (raw)
In-Reply-To: <20161005155510.GA1586@archie.localdomain>
Hello,
On Wed, Oct 05, 2016 at 05:55:10PM +0200, Clemens Gruber wrote:
> They write: "ARM on Linux. You must run an EABI kernel. These are
> generally known as armel for softfloat (compatible with ARMv5) or armhf
> for hardware floating point (ARMv6 and above)."
At least for Debian an ARMv6 compatible CPU (e.g. Raspberry Pi 1) cannot
run armhf. According to https://www.debian.org/ports/:
A lot of modern 32-bit ARM boards and devices ship with a
floating-point unit (FPU), but the Debian armel port doesn't
take much advantage of it. The armhf port was started to improve
this situation and also take advantage of other features of
newer ARM CPUs. The Debian armhf port requires at least an ARMv7
CPU with Thumb-2 and VFP3-D16 floating point support.
> If you set GOARM to 6 or 7 it always creates hardfloat code. So I think,
> setting it to anything else than 5 would lead to a crash on all
> architectures without a VFP unit?
Not necessarily. AFAIK given a properly configured kernel a hardfloat
instruction generates an exception that is then fixed up in the kernel.
It's not efficient but at least it works.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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next prev parent reply other threads:[~2016-10-06 6:33 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-04 15:23 Clemens Gruber
2016-10-05 13:13 ` Michael Olbrich
2016-10-05 15:55 ` Clemens Gruber
2016-10-05 16:31 ` Michael Olbrich
2016-10-05 20:42 ` Clemens Gruber
2016-10-06 9:17 ` Michael Olbrich
2016-10-07 16:47 ` Clemens Gruber
2016-10-07 18:37 ` Uwe Kleine-König
2016-10-11 16:18 ` Clemens Gruber
2016-10-12 0:07 ` Clemens Gruber
2016-10-06 6:33 ` Uwe Kleine-König [this message]
2016-10-06 10:04 ` Marc Kleine-Budde
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