[PATCH] Modify raspberrypi mm_config_table to map GPIO and registers.

[Hesham Moustafa]

On Mon, Oct 14, 2013 at 4:02 PM, Sebastian Huber <
sebastian.huber at embedded-brains.de> wrote:

> On 2013-10-14 15:34, Hesham AL-Matary wrote:
>
>> diff --git a/c/src/lib/libbsp/arm/**raspberrypi/startup/mm_config_**table.c
>> b/c/src/lib/libbsp/arm/**raspberrypi/startup/mm_config_**table.c
>> index 5436a76..2b748b2 100644
>> --- a/c/src/lib/libbsp/arm/**raspberrypi/startup/mm_config_**table.c
>> +++ b/c/src/lib/libbsp/arm/**raspberrypi/startup/mm_config_**table.c
>> @@ -42,7 +42,7 @@ bsp_mm_config_table[] = {
>>     }, {
>>       .begin = (uint32_t) bsp_section_text_begin,
>>       .end = (uint32_t) bsp_section_text_end,
>> -    .flags = ARMV7_MMU_CODE_CACHED
>> +    .flags = ARMV7_MMU_READ_WRITE
>>
>
> What is the problem with the cache?  Did the cache previously work?

There is a problem with applying a Read-Only permissions in general to this
area for RaspberryPi BSP.

>
>
>      }, {
>>       .begin = (uint32_t) bsp_section_rodata_begin,
>>       .end = (uint32_t) bsp_section_rodata_end,
>> @@ -63,8 +63,12 @@ bsp_mm_config_table[] = {
>>       .begin = (uint32_t) bsp_section_stack_begin,
>>       .end = (uint32_t) bsp_section_stack_end,
>>       .flags = MMU_DATA_READ_WRITE
>> +  }, {
>> +    .begin = 0x20000000,
>> +    .end = 0x20FFFFFF,
>> +    .flags = ARMV7_MMU_DATA_READ_WRITE
>>
>
> What is this for an area?
>
It's for Raspberry GPIO pins and other registers (defined at
raspbberrypi.h).

>
>      }
>>   };
>>
>
>
> --
> Sebastian Huber, embedded brains GmbH
>
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> Phone   : +49 89 189 47 41-16
> Fax     : +49 89 189 47 41-09
> E-Mail  : sebastian.huber at embedded-**brains.de<sebastian.huber at embedded-brains.de>
> PGP     : Public key available on request.
>
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