topic Re: icf file for RAM pool allocation in Kinetis Microcontrollers

icf file for RAM pool allocation

suhas_prabhu — Tue, 09 Jul 2019 05:29:04 GMT

Hello, For MK22FN512VLL12 i wanted to allocate the RAM memory with certain bytes (e.g 1K Bytes). is there any sample code and .icf for the same.

Thanks

Re: icf file for RAM pool allocation

jiri_kral — Tue, 09 Jul 2019 06:31:33 GMT

Hi,

we have community for Kinetis MCUs here - https://community.nxp.com/community/general-purpose-mcus/kinetis

Anyway - just define your custom section in linker file and place your variables there by #pragma... https://www.iar.com/support/tech-notes/linker/how-do-i-place-a-group-of-functions-or-variables-in-a-specific-section/

Hope it helps.

Jiri

Re: icf file for RAM pool allocation

suhas_prabhu — Tue, 09 Jul 2019 09:15:54 GMT

Hello,

Thanks for the reply,

I have the RAM definition done as

define symbol __ICFEDIT_region_RAM_start__ = 0x20007000;

define symbol __ICFEDIT_region_RAM_end__ = 0x2000EFFF;

define region RAM_region = mem:[from __ICFEDIT_region_RAM_start__ to __ICFEDIT_region_RAM_end__];

define region _COS_DMAM_1ST_POOL = mem:[from 0x20009000 to 0x2000BFFF ];

place in _COS_DMAM_1ST_POOL { readwrite section COS_DMAM_1ST_POOL };

//In the code I am using

#pragma default_variable_attributes = @ "COS_DMAM_1ST_POOL"
int y3[1000];

I am expecting the "y3" to present between 0x20009000 to 0x2000BFFF

Am I missing something? as I get following error if i allocate y3[1000]

Error[Lp011]: section placement failed
            unable to allocate space for sections/blocks with a total estimated minimum size of 0x8d3c bytes (max align 0x8) in <[0x2000'7000-0x2000'efff]> (total uncommitted space 0x8000).
            Needed:
            [0x2000'7000-0x2000'efff]: 0x7d9c min, align 0x8 (size: 0x8000)
            [0x2000'9000-0x2000'bfff]: 0xfa0 min, align 0x4 (size: 0x3000)

Re: icf file for RAM pool allocation

jiri_kral — Tue, 09 Jul 2019 10:31:54 GMT

Hi,

As I mentioned above - this community space is for S32 Design studio. I'm not familiar with your MCU and IAR - this is correct place for your question - https://community.nxp.com/community/general-purpose-mcus/kinetis

From your error message it looks, that you are using memory which is already used for regular RAM. You need to shrink existing RAM and use empty space for your section.

Jiri