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Message-ID: <alpine.DEB.2.21.1901071622160.2688@nanos.tec.linutronix.de>
Date: Mon, 7 Jan 2019 16:24:26 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: Paul Menzel <pmenzel@...gen.mpg.de>
cc: x86@...nel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: tsc: Fast TSC calibration failed with AMD B350M/Ryzen 3 2200G
Paul,
On Mon, 31 Dec 2018, Paul Menzel wrote:
> Linux 4.19.13 from Debian Sid/unstable logs the message below on the board MSI
> MS-7A37/B350M MORTAR with the processor AMD Ryzen 3 2200G.
>
> As a result, the early time stamps do not seem to be working.
> > [ 0.000000] DMI: Micro-Star International Co., Ltd. MS-7A37/B350M MORTAR
> > (MS-7A37), BIOS 1.I0 11/06/2018
> > [ 0.000000] tsc: Fast TSC calibration failed
And the further boot log says:
[ 0.036000] tsc: Unable to calibrate against PIT
[ 0.036000] tsc: using HPET reference calibration
[ 0.036000] tsc: Detected 3500.117 MHz processor
So the quick calibration in early boot fails because the PIT seems not to
do what the kernel expects. Nothing we can cure :(
Thanks,
tglx
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