linux-kernel - Re: [PATCH 2/3] ACPI: SPCR: Add support for AMD CT/SZ

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Message-ID: <01bc6f27-57aa-d8e9-934b-191a128543cf@jonmasters.org>
Date:   Mon, 16 Apr 2018 20:43:46 -0400
From:   Jon Masters <jcm@...masters.org>
To:     Daniel Kurtz <djkurtz@...omium.org>
Cc:     adurbin@...omium.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        "open list:ACPI" <linux-acpi@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] ACPI: SPCR: Add support for AMD CT/SZ

On 03/13/2018 08:36 PM, Daniel Kurtz wrote:
> AMD Carrizo / Stoneyridge use a DesignWare 8250 UART that uses a special
> earlycon setup handler to configure its input clock in order to compute
> baud rate divisor registers.
> Detect them by examining the OEMID field in the SPCR header, and pass
> then pass uart type amdcz to earlycon.

FYI I spoke with Microsoft some time ago about standardizing the ability
to convey non-standard baud rates in the SPCR. If you're interested in
driving, I can put you in touch with the right person over there.

Jon.

-- 
Computer Architect