topic Re: How to use Kinetis entire RAM? in Kinetis Design Studio

How to use Kinetis entire RAM?

ashesman — Tue, 01 Nov 2016 23:13:02 GMT

Hi,

The linker file for K22 presents the RMA as two 64k blocks m_data and M_data_2. Presumably this is to prevent the risk of locating across the RAM boundaries etc. It locates the heap and stack into m_data_2 and bss into m_data. But otherwise leaves m_data_2 as empty.

I need more RAM! It seems odd to me not to have the unused space in m_data_2 used also for bss!

I tried to change the linker file and add a new section then locate my bigger arrays into this new section but I couldn't make it happen, instead the arrays just vanished from the map file!!!

Any advice on how to use all the available RAM?

Regards

Ashley

Re: How to use Kinetis entire RAM?

Alice_Yang — Wed, 02 Nov 2016 05:58:09 GMT

Hello Ashley,

Does this DOC can help you ?

Relocating Code and Data Using the KDS GCC Linker File for Kinetis

especially this part :

Hope it helps

Have a great day,
Alice

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Re: How to use Kinetis entire RAM?

ashesman — Wed, 02 Nov 2016 21:51:09 GMT

Great, thanks that does help. I had it all exactly like that but hadn't quite got the section definition right in the linker file...

Re: How to use Kinetis entire RAM?

Alice_Yang — Thu, 03 Nov 2016 02:25:23 GMT

Hello Ashley,

Sorry i'm not very clealy about your these words " I had it all exactly like that but hadn't quite got the section definition right in the linker file" , could you please describe it clearly ? Or i don't know what can i do for you .

ALice

Re: How to use Kinetis entire RAM?

ashesman — Tue, 08 Nov 2016 00:09:31 GMT

Sorry. No problem. It is all sorted now. I was trying to say "I had it almost right but not quite..." Thanks for your help.

Re: How to use Kinetis entire RAM?

Alice_Yang — Tue, 08 Nov 2016 02:28:04 GMT

OK !