ramfunc.c

defines.h:
// Force a functon to be copied&exec from RAM. Use sparingly
#define RAMFUNC __attribute((long_call, section(".ramfunc")))

ldscript:

The magic :

[...] memory from ldscript.. [...]
MEMORY
{
	bootphase1 : ORIGIN = 0x00100000, LENGTH = 0x200             /* Phase 1 bootloader: Copies real bootloader to RAM */
	bootphase2 : ORIGIN = 0x00100200, LENGTH = 0x2000 - 0x200    /* Main bootloader code, stored in Flash, executed from RAM */
	osimage    : ORIGIN = 0x00102000, LENGTH = 256K - 0x2000     /* Place where the main OS will end up */
	ram        : ORIGIN = 0x00200000, LENGTH = 64K - 0x20        /* RAM, minus small common area */
	commonarea : ORIGIN = 0x00200000 + 64K - 0x20, LENGTH = 0x20 /* Communication between bootloader and main OS */
}

_bootphase1_version_pointer = ORIGIN(bootphase1) + LENGTH(bootphase1) - 0x4;
_osimage_entry = ORIGIN(osimage);
_bootrom_start = ORIGIN(bootphase1);
_bootrom_end = ORIGIN(bootphase2) + LENGTH(bootphase2);
_flash_start = ORIGIN(bootphase1);
_flash_end = ORIGIN(osimage) + LENGTH(osimage);


[[...]] THE REALTHING

	.data : {
		KEEP(*(compressed_data))
		*(.data)
		*(.data.*)
		*(.ramfunc)
		. = ALIGN(4);
	} >ram AT>osimage :data

	__data_src_start__ = LOADADDR(.data);
	__data_start__ = ADDR(.data);
	__data_end__ = __data_start__ + SIZEOF(.data);
	__os_size__ = SIZEOF(.text) + SIZEOF(.data) + SIZEOF(.rodata);

// BSS GIVEN AS A SCALE, NO BANANA AVAILABLE
	.bss : {
		__bss_start__ = .;
		*(.bss)
		*(.bss.*)
		. = ALIGN(4);
		__bss_end__ = .;
	} >ram AT>ram :bss