[U-Boot] RFC: Aligning arch initialisation sequences

[Reinhard Meyer <u-boot@emk-elektronik.de>]

Dear Wolfgang Denk,
> Yes, and this is correct. board_init_f != board_early_init_f

To make it crystal clear now:

void board_init_f (ulong bootflag)
{
	bd_t *bd;
	init_fnc_t **init_fnc_ptr;
	gd_t *id;
	ulong addr, addr_sp;
+	gd_t auto_gd;

	/* Pointer is writable since we allocated a register for it */
-	gd = (gd_t *) (CONFIG_SYS_INIT_SP_ADDR);
+	gd = &auto_gd;
	/* compiler optimization barrier needed for GCC >= 3.4 */
/* Q: why is that needed anyway ??? */
	__asm__ __volatile__("": : :"memory");

	memset ((void*)gd, 0, sizeof (gd_t));
....
	debug ("relocation Offset is: %08lx\n", gd->reloc_off);
	memcpy (id, (void *)gd, sizeof (gd_t));

	relocate_code (addr_sp, id, addr);

	/* NOTREACHED - relocate_code() does not return */
}

This, and setting CONFIG_SYS_INIT_SP_ADDR to an aligned value in
initial storage (SRAM, pinned down Cache, or other) removes alot
of the headache about making stuff aligned.

Best Regards,
Reinhard