[PATCH] bsps/arm: Add support for MPU region alignment

[Sebastian Huber]

On 02/04/2020 16:44, Gedare Bloom wrote:

> On Thu, Apr 2, 2020 at 12:15 AM Sebastian Huber
> <sebastian.huber at embedded-brains.de>  wrote:
>> ---
>>   bsps/arm/shared/start/linkcmds.base | 21 +++++++++++++++++++++
>>   1 file changed, 21 insertions(+)
>>
>> diff --git a/bsps/arm/shared/start/linkcmds.base b/bsps/arm/shared/start/linkcmds.base
>> index 1f5f1ef959..d0663cf97e 100644
>> --- a/bsps/arm/shared/start/linkcmds.base
>> +++ b/bsps/arm/shared/start/linkcmds.base
>> @@ -81,6 +81,17 @@ SECTIONS {
>>          } > REGION_TEXT AT > REGION_TEXT_LOAD
>>          .fini : ALIGN_WITH_INPUT {
>>                  KEEP (*(.fini))
>> +
>> +               /*
>> +                * If requested, align the size of the combined start and text
>> +                * section to the next power of two to meet MPU region
>> +                * alignment requirements.
>> +                */
>> +               . = DEFINED (bsp_section_do_mpu_align) ?
>> +                   bsp_section_start_begin
>> +                   + ALIGN (. - bsp_section_start_begin,
>> +                   1 << LOG2CEIL (. - bsp_section_start_begin)) : .;
> This looks alright. I don't find the symbol bsp_section_do_mpu_align
> anywhere though, is it currently unused?
>
> Do you need this in 5.1.0 for something?
This can wait, it is for the new STM32H7 BSP. It could be useful for the 
other ARMv7-M BSPs as well.
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