[U-Boot-Users] How to Understanding Internal SRAM (of ARM)

[liang a lei]

hi,

I am reading source of "~/lib-arm/board", and wander on the "gd_data", it's
declared like:

void start_armboot (void)
{
 DECLARE_GLOBAL_DATA_PTR;
 :
 gd_t gd_data;
 :
 :
 /* Pointer is writable since we allocated a register for it */
 gd = &gd_data;
 memset ((void *)gd, 0, sizeof (gd_t));
 :
}

My question is: gd_data must or may be lacated at Internal SRAM (in arm, by
disable cache, it is?), but how to force the linker to allocate "gd_data" to
some specific place(which I mean to Internal SRAM) instead of external RAM?
(BTW, I just begin to learn to read&understanding Makefile, and
lib-arm/Makefile and topdir's config.mk has been read to find some FLAGS
hints, but no answer. So bother you to give me a hint, thanks )