CodeWarrior 10.6, mpc5604 defines variables in the specified flash area

[ahjg_xu]

Hello! I use mpc5604p and now use CodeWarrior 10.6 compiler. I want to directly define variables in the specified flash area (the flash area is the start page) when compiling the program.

When I use ac512, @ can realize this function. However, mpc5604 failed and the compiler reported an error; Hope to get your help to realize this function, thank you

[davidtosenovjan]

If you just want have to have variable in flash, it cannot be done just because variable suppose its location in volatile memory, whilst flash is non-volatile memory.

Here I have described how it is possible to relocate code to the RAM:

https://community.nxp.com/t5/MPC5xxx/MPC560xB-Copy-a-code-from-flash-to-RAM-for-executing-it-in-RAM/...

Similar approach can be used with data as well but

- variable is already located in RAM whilst its default value is being loaded from flash during init, thus I don’t see any reason for relocation

int i = 10;

- if you need specific alignment, use pragma aligned like this (aligns to 8 bytes)

vuint32_t test[2] __attribute__ ((aligned (8))) =

{

    0xBABADEDA,

    0xABBAABBA

};

- if you really need to access specific address, you can do it as follows where 0x40000000 specifies address (don’t forget to reserve space in linker command file) for this accesses:

*(unsigned int*)0x40000000  = 0x44444444;