Re: [PATCH] ARM: debug: add support for alternate 8250 register layout

["Måns Rullgård" <mans@mansr.com>]

Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> writes:

> Hello.
>
> On 10/2/2015 3:12 PM, Mans Rullgard wrote:
>
>> Some SoCs have a UART with a non-standard register layout. This
>> allows the debug console to work with these.
>
>> Signed-off-by: Mans Rullgard <mans@mansr.com>
>> ---
>> I would have preferred a more accurate description of the UART, but I've
>> not managed to figure out who the vendor is.
>
>    You haven't seem the Alchemy datasheets? I can send you some if so.

I have.  They don't say where Alchemy bought the UART block.

>> ---
>>   arch/arm/Kconfig.debug        |  4 ++++
>>   arch/arm/include/debug/8250.S | 12 ++++++++++++
>>   2 files changed, 16 insertions(+)
>>
>> diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
>> index 0cfd7f9..8d5c837 100644
>> --- a/arch/arm/Kconfig.debug
>> +++ b/arch/arm/Kconfig.debug
>> @@ -1597,6 +1597,10 @@ config DEBUG_UART_8250_WORD
>>   		DEBUG_BCM_KONA_UART || DEBUG_RK32_UART2 || \
>>   		DEBUG_BRCMSTB_UART
>>
>> +config DEBUG_UART_8250_AU
>> +       bool "8250 UART has Alchemy register layout"
>> +       depends on DEBUG_LL_UART_8250 || DEBUG_UART_8250
>> +
>
>    So Alchemy UART got reused on ARM?

The UART is actually a Palmchip IP core used by several SoC companies.

-- 
Måns Rullgård
mans@mansr.com