linux-kernel - RE: [PATCH] ARC: guard dsp early init against non ARCv2

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Date:   Wed, 29 Apr 2020 06:19:55 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>
CC:     Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Angelo Ribeiro <Angelo.Ribeiro@...opsys.com>
Subject: RE: [PATCH] ARC: guard dsp early init against non ARCv2

From: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
Date: Apr/28/2020, 19:50:24 (UTC+00:00)

> As of today we guard early DSP init code with
> ARC_AUX_DSP_BUILD (0x7A) BCR check to verify that we have
> CPU with DSP configured. However that's not enough as in
> ARCv1 CPU the same BCR (0x7A) is used for checking MUL/MAC
> instructions presence.
> 
> So, let's guard DSP early init against non ARCv2.
> 
> Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>

Reported-by: Angelo Ribeiro 
<angelor@...opsys.com>

---
Thanks,
Jose Miguel Abreu