linux-kernel - Re: [PATCH 0/5] Add initial Bitmain BM1880 SoC/Board support

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Message-ID: <20190126150320.GB20679@lunn.ch>
Date:   Sat, 26 Jan 2019 16:03:20 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     robh+dt@...nel.org, arnd@...db.de,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, amit.kucheria@...aro.org,
        darren.tsao@...main.com, haitao.suo@...main.com
Subject: Re: [PATCH 0/5] Add initial Bitmain BM1880 SoC/Board support

On Sat, Jan 26, 2019 at 09:40:36AM +0530, Manivannan Sadhasivam wrote:
> Hello,
> 
> This patchset adds initial support for Bitmain BM1880 SoC and Sophon
> Edge board. BM1880 SoC consists of a Dual Core ARM Cortex A53 Application
> processor subsystem, a single core RISC-V subsystem and a Tensor
> Processor subsystem.

Hi Manivannan

Interesting combination of CPUs. 

> This patchset adds support for only ARM Cortex A53 Application
> processor subsystem with UART, which enables the board to boot into
> initramfs with 2 CPUs.

Looking forward, what sharing do you expect at the device tree level?

Looking at 

https://sophon-file.bitmain.com.cn/sophon-prod/drive/18/11/06/19/BM1880%20product%20brief%20V0.04_Chinese%20versionV0.06.pdf

it appears all the devices can be shared between the CPUs. So do you
plan to have a shared .dtsi file somewhere? 

Is ARCH_BITMAIN going to be both ARM64 and RISC-V?

   Thanks
	Andrew