Encountered a problem on the RTCS and MQX.

[jetli]

In my project, I encountered a problem：

In Kinetis K66，my board with a 16MB SDRAM，I need change ram pool to SDRAM, so I use this code at the first task:

_mem_pool_id test_id , old_id ;
test_id = _mem_create_pool((void *)0x08000000,(_mem_size)0x00A00000);  //10MB
old_id = _mem_set_default_pool(test_id);

so , I can use function "malloc" in my project allocate memory at address 0x08000000;

but, I encountered a problem use this with RTCS , when i set SDRAM address at "0x70000000", "0x80000000","0x88000000", RTCS working properly , but when I  set SDRAM address at "0x08000000", RTCS will not working properly,but the rest of the system work all normal。

ps：MQX and RTCS version is 4.2.0  

[DavidS]

Hi jet,

It might actually be the memory map accesses that are (or are not) allowed.

Look at the Reference Manual Table 5-1 "System memory map" on Chapter 5.

The 0x0800_0000 - 0x0FFF_FFFF allows only core access.

The other addresses that work for you allow "All masters".

Regards,

David

[jetli]

Hi David,

Thanks  alot , Your reply to my problem.