Re: [PATCH 5/6] ARM: add low level debug uart for rk1108

[Andy Yan <andy.yan@rock-chips.com>]

Hi Heiko:


On 2016年11月04日 15:36, Heiko Stuebner wrote:
> Am Donnerstag, 3. November 2016, 20:42:21 CET schrieb Andy Yan:
>> RK1108 UARTs are Synopsis DesignWare 8250 compatible.
>> Only with different register addresses.
>>
>> Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
>> ---
>>
>>   arch/arm/Kconfig.debug | 30 ++++++++++++++++++++++++++++++
>>   1 file changed, 30 insertions(+)
>>
>> diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
>> index d83f7c3..408540f 100644
>> --- a/arch/arm/Kconfig.debug
>> +++ b/arch/arm/Kconfig.debug
>> @@ -776,6 +776,30 @@ choice
>>   		  their output to the standard serial port on the RealView
>>   		  PB1176 platform.
>>
>> +	config DEBUG_RK1108_UART0
>> +		bool "Kernel low-level debugging messages via Rockchip RK1108 UART0"
>> +		depends on ARCH_ROCKCHIP
>> +		select DEBUG_UART_8250
>> +		help
>> +		  Say Y here if you want kernel low-level debugging support
>> +                  on Rockchip RK1108 based platforms.
>> +
>> +	config DEBUG_RK1108_UART1
>> +		bool "Kernel low-level debugging messages via Rockchip RK1108 UART1"
>> +		depends on ARCH_ROCKCHIP
>> +		select DEBUG_UART_8250
>> +		help
>> +		  Say Y here if you want kernel low-level debugging support
>> +		  on Rockchip RK1108 based platforms.
>> +
>> +	config DEBUG_RK1108_UART2
>> +		bool "Kernel low-level debugging messages via Rockchip RK1108 UART2"
>> +		depends on ARCH_ROCKCHIP
>> +		select DEBUG_UART_8250
>> +		help
>> +		  Say Y here if you want kernel low-level debugging support
>> +		  on Rockchip RK1108 based platforms.
>> +
> are you sure, you need all 3 of them?
>
> I.e. most Rockchip SoCs so far had one uart somewhat designated as debug uart.
> Most likely due to it not having rts/cts and being used in reference
> schematics, but no one ever used another uart than uart2 on previous socs. So
> ideally we could check and only add uarts we actually need for now. More can
> be added later anyway once boards try to use them.
>
>
> Heiko
>

     Actually, I have two boards on my hand, one uses uart0 as debug 
port and the another uses uart2, so I add all of them here.

    I have a question here, I not very clear how to get the 
DEBUG_UART_VIRT value here,  I now set the value I got from uart driver 
and it works , is there some rule or  method to calculate this 
DEBUG_UART_VIRT value on different platform?
>