MPC5606B  Configure global variable in flash address which i want to be

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MPC5606B  Configure global variable in flash address which i want to be

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明伟张
Contributor III

i want to configure some global variables in the flash specified address;

please supply sample code for me;

 

thanks!

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4 Replies

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lukaszadrapa
NXP TechSupport
NXP TechSupport

Hi,

is this the same question like in

MPC5606B Configure variable in RAM to run

?

If you want to place just a constant to specific flash segment then use:

Linker file:

MEMORY

{

...

my_flash:    org = 0x003FF000,   len = 0x00001000

...

}

SECTIONS

{

...

.__my_flash LOAD (0x003FF000): {} > my_flash

...

}

In *.c file:

#pragma push

//#pragma section sconst_type ".__my_flash" ".__my_flash "

//or

#pragma section all_types ".__my_flash" ".__my_flash "

const uint32_t test = 0x1234;

#pragma pop

Regards,

Lukas

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608 Views
michaelchien
Contributor II

Hello Lukas

    I'm trying to have a constant variables in the specified flash address 0x1000000;

    I follow your suggestion, but I get a syntax error with .__my_flash LOAD (0x1000000): {} > my_flash.

    do you have any idea about this?

   My microcontroller is MPC5746C with S32 Design Studio for Power Architecture v1.2 complier.

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明伟张
Contributor III

thanks! "const" can be delete or not? the variable"test" value can be modified in flash??

thanks for your answer!!

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lukaszadrapa
NXP TechSupport
NXP TechSupport

Hi,

yes, there must be "const". If you want to have variable in RAM, you have to follow this:

Re: MPC5606B Configure variable in RAM to run

You can modify the flash in both cases.

Regards,

Lukas

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