[U-Boot] [PATCH v3] serial: Add serial driver for Intel MID

Andy Shevchenko andy.shevchenko at gmail.com
Mon Mar 13 14:09:15 UTC 2017


On Fri, Mar 3, 2017 at 12:31 PM, Kever Yang <kever.yang at rock-chips.com> wrote:
> On 02/28/2017 08:04 PM, Andy Shevchenko wrote:
>>
>> Add a specific serial driver for Intel MID platforms.
>>
>> It has special fractional divider which can be programmed via UART_PS,
>> UART_MUL, and UART_DIV registers.
>>
>> The UART clock is calculated as
>>
>>         UART clock = XTAL * UART_MUL / UART_DIV
>>
>> The baudrate is calculated as
>>
>>         baud rate = UART clock / UART_PS / DLAB
>>
>> Initialize fractional divider correctly for Intel Edison platform.
>>
>> For backward compatibility we have to set initial DLAB value to 16
>> and speed to 115200 baud, where initial frequency is 29491200Hz, and
>> XTAL frequency is 38.4MHz.

> Reviewed-by: Kever Yang <kever.yang at rock-chips.com>

Thanks!

Tom et all, is it forgotten?

-- 
With Best Regards,
Andy Shevchenko


More information about the U-Boot mailing list