From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: arm64: kernel v4.6-rc1 hangs on QEMU
Date: Wed, 30 Mar 2016 00:32:42 +0200 [thread overview]
Message-ID: <3334343.7r57EH3qRj@wuerfel> (raw)
In-Reply-To: <20160329222217.GA31869@yury-N73SV>
On Wednesday 30 March 2016 01:22:17 Yury Norov wrote:
> >
> > Undefined instruction in cpuinfo_store_boot_cpu() could be related
> > to the SYS_ID_AA64MMFR2_EL1 access that was recently added.
> >
> > What does the architecture say about reading unknown cpuid registers?
> >
> > Arnd
>
> ThunderX has some unimplemented system registers. AFAIR, attempt to access it
> causes data abort.
Ok, if that is the case, maybe the read_cpuid() macro can be changed
so it contains a fixup for the trap? That should handle both data abort
and undefinstr.
Arnd
next prev parent reply other threads:[~2016-03-29 22:32 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-29 22:05 arm64: kernel v4.6-rc1 hangs on QEMU Yury Norov
2016-03-29 22:12 ` Arnd Bergmann
2016-03-29 22:22 ` Yury Norov
2016-03-29 22:32 ` Arnd Bergmann [this message]
2016-03-29 22:52 ` Yury Norov
2016-03-30 6:44 ` Kefeng Wang
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