AVR32795 datasheet(11/22 Pages) ATMEL

11 / 22 page

AVR32795

32158A-AVR-01/11

6.1.2 Related examples in the software framework

• drivers/flashc/flash_example/: Controlling the location of a variable in flash

• drivers/cpu/mpu/example/:

Controlling the location of a function in flash

6.2 Controlling the location of functions in internal RAM

6.2.1 Process flow

A. Define a custom output section, .ram_fcts, with VMA in RAM and LMA in flash:

.ram_fcts

{

*(.ram_fcts.*)

} >INTRAM

AT>FLASH

:FLASH

B. Locate a function in a custom section, .ram_fcts:

Extensions to the C language family:

Declaring attributes of functions

__attribute__ ((__section__(".ram_fcts"))) void Func(void) {…}

C. The startup routine is responsible for copying the .ram_fcts LMA (in flash) to the

.ram_fcts

VMA (in INTRAM), as is done for the .data section.

6.2.2 Related examples

Examples of a startup routine implementation can be found in the AVR Software

Framework

under

utils/startup_files/gcc/

ASF

and

under

utils/startup/startup_uc3.S in ASF v2.

An example using the same method can be found here:

AVR32749 Application note: Software Workaround Implementation for the Erratum

Flash Read-after-Write for AT32UC3A0512 / AT32UC3A1512 Revision E, H and I.

Include all input sections .ram_fcts

Assign a section to a previously defined segment

(cf PHDRS command)

Specify a memory region for the .text section LMA

Assign this section’s VMA to the INTRAM region of memory

(defined in MEMORY{ })

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