linux-kernel - Re: [PATCH] arm64: dts: realtek: Add Realtek rtd1619 and mjolnir

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Message-ID: <7a05ac2c-00bc-b2ac-0a33-be0242d33188@suse.de>
Date:   Fri, 8 Nov 2019 18:17:25 +0100
From:   Andreas Färber <afaerber@...e.de>
To:     James Tai <james.tai@...ltek.com>
Cc:     "linux-realtek-soc@...ts.infradead.org" 
        <linux-realtek-soc@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH] arm64: dts: realtek: Add Realtek rtd1619 and mjolnir

Hi James,

Am 08.11.19 um 16:36 schrieb James Tai:
>> And double-check whether you actually need <2> - compare rtd129x.dtsi using
>> <1> because nothing went beyond 32-bit address space. It was a review
>> request back then. Can RTD1619 have more than 2 GiB RAM, with a second
>> RAM region in high mem, requiring two cells for memory nodes?
>>
> The RTD1619 can support more than 2 GiB RAM.

How much? More than 0x98000000? The RTD1395 datasheet says up to 4 GB -
does that mean it continues in a second region beyond 0xffffffff? Those
locations should be excluded in the soc node ranges (which you sadly
appear to have dropped in v2).

I'll try to post a patch for RTD1295 soon to demonstrate, it's just a
little time-consuming with the 100+ commits on top of linux-next that
need to be rebased then... RTD1195 may be quicker.

Regards,
Andreas

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