Date: Tue, 13 Sep 2016 11:20:37 +0100 From: Andrew Turner <andrew@fubar.geek.nz> To: John-Mark Gurney <jmg@funkthat.com> Cc: freebsd-arm@FreeBSD.org Subject: Re: interesting arm issue/bug Message-ID: <20160913112037.0e06cb4d@zapp> In-Reply-To: <20160912213643.GE1691@funkthat.com> References: <20160912213643.GE1691@funkthat.com>
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On Mon, 12 Sep 2016 14:36:43 -0700 John-Mark Gurney <jmg@funkthat.com> wrote: > I'm not sure if we run on this hardware or not, but I thought it'd be > good to bring this to the attention of the list: > http://www.mono-project.com/news/2016/09/12/arm64-icache/ > We don't boot on this hardware. It is also my understanding having a mismatch in the CTR_EL0 register is a violation of the architecture, and therefore a hardware bug. If someone was to port FreeBSD to this SoC they would need to do something similar to the proposed Linux fix and trap access to the CTR_EL0 register to return a stable minimum value. I note there is a similar issue with an earlier Samsung ARMv7 SoC, however we don't support multi-cluster on 32-bit ARM so this isn't a problem for us. Andrew
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