From: Pavel Machek <pavel@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] qemu-x86 issues
Date: Sat, 3 Dec 2016 12:09:17 +0100 [thread overview]
Message-ID: <20161203110917.GA12605@amd> (raw)
In-Reply-To: <CAEUhbmX64T7TuJOGquuZxMqdinvX=82RwyryZTuZN2agxm21PQ@mail.gmail.com>
Hi!
> > Bah, lemme correct myself. MIPS* and PowerPC fail due to sleep taking
> > slightly too long. x86 is the only one where it's just way too fast.
> > But this is not true once Linux itself is up.
> >
>
> U-Boot uses x86 TSC timer as the delay timer. Right now the timer
> frequency is hard-coded in device tree. Auto-calibration does not work
> on QEMU. I need have another check to see if we can do
> auto-calibration.
TSC is not really suitable for delays on x86. (Actually, TSC is pretty
much not suitable for anything :-) ). PIT should be easy to use and
work everywhere...
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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prev parent reply other threads:[~2016-12-03 11:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-14 23:32 [U-Boot] qemu-x86 issues Tom Rini
2016-10-18 2:36 ` Bin Meng
2016-10-18 13:19 ` Tom Rini
2016-10-18 13:35 ` Tom Rini
2016-10-19 3:18 ` Bin Meng
2016-10-19 12:03 ` Tom Rini
2016-12-03 11:09 ` Pavel Machek [this message]
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