linux-kernel - Re: [PATCH 1/3] x86, boot: add mmio serial during compressed boot

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Date:	Fri, 12 Jul 2013 13:17:21 -0700
From:	Kees Cook <keescook@...omium.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Landley <rob@...dley.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	linux-serial@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 1/3] x86, boot: add mmio serial during compressed boot

[resend, gmail tricked me into HTML mode...]

On Fri, Jul 12, 2013 at 1:15 PM, Kees Cook <keescook@...omium.org> wrote:
> On Fri, Jul 12, 2013 at 1:07 PM, Kees Cook <keescook@...omium.org> wrote:
>>
>> Allows "console=uart[8250],mmio[32],0xADDR[,BAUDn8[,BASE_BAUD]]" to
>> be recognized during compressed boot early console setup, and during
>> boot console setup. Replaces defines with common serial defines. Adds
>> suport for mmio-based serial devices to compressed-boot early console,
>> and plumbs support for defining the base baud rate for UART clock
>> calculations (since mmio serial cards may not have the standard rate,
>> resulting in incorrect baud rates for mmio devices).
>>
>> Signed-off-by: Kees Cook <keescook@...omium.org>
>> ---
>> diff --git a/include/uapi/linux/serial_reg.h
>> b/include/uapi/linux/serial_reg.h
>> index e632260..bdeaf5a 100644
>> --- a/include/uapi/linux/serial_reg.h
>> +++ b/include/uapi/linux/serial_reg.h
>> @@ -333,12 +333,13 @@
>>
>>  #define UART_RSA_TCR_SWITCH (1 << 0) /* Timer on */
>>
>> +#define SERIAL_BAUD_BASE (1843200/16)
>>  /*
>>   * The RSA DSV/II board has two fixed clock frequencies.  One is the
>>   * standard rate, and the other is 8 times faster.
>>   */
>> -#define SERIAL_RSA_BAUD_BASE (921600)
>> -#define SERIAL_RSA_BAUD_BASE_LO (SERIAL_RSA_BAUD_BASE / 8)
>> +#define SERIAL_RSA_BAUD_BASE_LO SERIAL_BAUD_BASE
>> +#define SERIAL_RSA_BAUD_BASE (SERIAL_RSA_BAUD_BASE * 8)
>
>
> Argh, just found this typo during an allyesconfig build. Above should be:
>
> #define SERIAL_RSA_BAUD_BASE (SERIAL_BAUD_BASE * 8)
>
> -Kees
>
> --
> Kees Cook
> Chrome OS Security



--
Kees Cook
Chrome OS Security
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