[PATCH 0/5] Improvements for atsam BSP and sc16is752 UART.

Christian Mauderer christian.mauderer at embedded-brains.de
Wed Feb 14 06:16:42 UTC 2018

Am 13.02.2018 um 12:05 schrieb Chris Johns:
>> On 13 Feb 2018, at 5:37 pm, Christian Mauderer <christian.mauderer at embedded-brains.de> wrote:
>>> Am 13.02.2018 um 00:34 schrieb Chris Johns:
>>>> On 13/02/2018 00:39, Christian Mauderer wrote:
>>>> These patches add various improvements for the atsam BSP and for the
>>>> sc16is752 SPI UART controller.
>>>> Regarding patch 1: Note that I have thought about an auto detection
>>>> instead of the option. But I had a board where something responded to
>>>> the oscillator so that I could initialize it despite the fact that no
>>>> crystall has been connected. So I think an auto detection would be
>>>> dangerous.
>>> I agree with this approach.
>>> Auto-detection is OK in systems with users however in embedded systems it is
>>> dangerous. I have a rule, any auto-detection requires a system level module that
>>> audits the part of a system that has auto-detection and raises any unexpected
>>> differences as errors. Auto-detection can be hard to avoid in some systems, ie
>>> PC motherboards, PCI etc.
>>> I remember back in the mid-90s working on an important system with RAM size
>>> detection where one of two static RAM chips had started to fail and the system
>>> adjusted assuming this was all the available memory so no one noticed until many
>>> many months into operation the application was reconfigured and it ran out of
>>> memory when it should not have. At the start of the project I had been asked to
>>> add the memory detection to handle different build variants of the hardware. The
>>> feature was disabled and I have not been a fan of it ever since.
>>> Chris
>> Hello Chris,
>> thanks for the support for this approach. I mostly wanted to give a
>> reason why I thought it would be necessary to add another option to the BSP.
>> Any other remarks regarding the patches? Can I apply them?
> Yes, they look fine. I do not know the hardware so I assume that part is fine. 
> Chris

Hello Chris,

thanks for taking a look. I pushed the patches.



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