linux-kernel - Re: [PATCH v2 2/2] serial: earlycon: allow to specify uartclk in earlycon kernel-parameter

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Date:	Thu, 22 Oct 2015 12:58:31 +0900
From:	Masahiro Yamada <yamada.masahiro@...ionext.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Rob Herring <robh@...nel.org>, Stefan Agner <stefan@...er.ch>,
	linux-serial@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jiri Slaby <jslaby@...e.com>
Subject: Re: [PATCH v2 2/2] serial: earlycon: allow to specify uartclk in
 earlycon kernel-parameter

Hi Peter,

2015-10-22 0:35 GMT+09:00 Peter Hurley <peter@...leysoftware.com>:
> Hi Masahiro,
>
> On 10/21/2015 11:31 AM, Masahiro Yamada wrote:
>> If it is always correct to preserve the initialization done by boot-loader,
>> the following code in 8250_early.c does not make sense.
>
> It's not always correct to preserve the initialization by the bootloader.
> For example, on my legacy x86 workstation, the bootloader does not
> initialize the h/w so when I want 8250 earlycon, I must specify the
> baud rate.

So, the input clock on the machine matches the following macro.

#define BASE_BAUD (1843200/16)


For ARM boards, we should depend on a boot loader.
Is this what you mean?

-- 
Best Regards
Masahiro Yamada
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