Hi Heiko:
On 2016?11?04? 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 at 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?
>
