linux-kernel - Re: [PATCH v2 2/4] MIPS: Introduce config options for LLSC availability

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Message-ID: <ZnRpxMfs0Eql87r3@alpha.franken.de>
Date: Thu, 20 Jun 2024 19:41:24 +0200
From: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To: Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: Jonas Gorski <jonas.gorski@...il.com>,
	"Maciej W. Rozycki" <macro@...am.me.uk>,
	"linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] MIPS: Introduce config options for LLSC
 availability

On Thu, Jun 20, 2024 at 05:30:48PM +0100, Jiaxun Yang wrote:
> 
> 
> 在2024年6月20日六月 下午5:06，Thomas Bogendoerfer写道：
> [...]
> > do you have an user manual stating that the R5k bug is fixed on this CPUs ?
> 
> I actually investigated R5500 a little bit.
> 
> There is no explicit document mentioned this bug is fixed on R5500, but it's not
> mentioned on "VR Series 64-/32-Bit Microprocessor Programming Guide" [1] either,
> while some other hardware limitations are mentioned in that guide.
> 
> Plus EMMA platform, which was removed form the kernel, doesn't have
> cpu-feature-overrides.h. This means that the platform was running with LLSC
> enabled.
> 
> So I think this CPU is not affected.

found a preliminary datasheet and it supports your thinking;-)

Thomas.

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