[PATCH] ARM: debug: add support for alternate 8250 register layout
mans at mansr.com
Fri Oct 2 07:37:17 PDT 2015
Sergei Shtylyov <sergei.shtylyov at cogentembedded.com> writes:
> On 10/2/2015 5:26 PM, Måns Rullgård 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 at 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.
> In fact, seeing at least Au1550 databook googling for "alchemy databook".
> The UART registers are described there. Perhaps, it's not accurate
> enought for your needs, though...
I have all the information I need about how it works.
>>>> 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 || \
>>>> +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.
> Hm, how have you figured out that;s Palmchip if the Alchemy
> databooks are silent about that? :-)
Someone with access to hardware design files told me.
mans at mansr.com
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