memory: reserve from start_addr_sp to initial_relocaddr

Add a new global data struct member called initial_relocaddr. This
stores the original value of relocaddr, directly from setup_dest_addr.
This is specifically to avoid any adjustments made by other init
functions.

Reserve the memory from gd->start_addr_sp - CONFIG_STACK_SIZE to
gd->initial_relocaddr instead of gd->ram_top. This allows platform
specific relocation addresses to work without unnecessarily painting
over a large range.

Signed-off-by: Randolph Sapp <rs@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

common/board_f.c

@@ -330,6 +330,8 @@ __weak int arch_setup_dest_addr(void)
 
 static int setup_dest_addr(void)
 {
+	int ret;
+
 	debug("Monitor len: %08x\n", gd->mon_len);
 	/*
 	 * Ram is setup, size stored in gd !!
@@ -356,7 +358,12 @@ static int setup_dest_addr(void)
 	gd->relocaddr = gd->ram_top;
 	debug("Ram top: %08llX\n", (unsigned long long)gd->ram_top);
 
-	return arch_setup_dest_addr();
+	ret = arch_setup_dest_addr();
+	if (ret)
+		return ret;
+
+	gd->initial_relocaddr = gd->relocaddr;
+	return 0;
 }
 
 #ifdef CFG_PRAM