armv7: make bootblock linker script more explicit

This adds a .bl1 and .start symbol that is placed at the beginning
of the .rom section.

The goal is to move the .id section in between the reset vector and
bootblock_main.

Change-Id: Ie732ce656d697c059cc0fa40c844b39f53fc214c
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/2344
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/arch/armv7/bootblock.inc

@@ -31,6 +31,7 @@
 
 #include <system.h>
 
+.section ".bl1", "a", %progbits
 _bl1:
 	/* For now we have to live with a first stage boot loader
 	 * on ARM, which is 8KB in size and it is prepended to the
@@ -38,6 +39,7 @@ _bl1:
 	 */
 	.skip (CONFIG_BL1_SIZE_KB * 1024)
 
+.section ".start", "a", %progbits
 .globl _start
 _start: b	reset
 	.balignl 16,0xdeadbeef

src/arch/armv7/bootblock.lds

@@ -30,6 +30,8 @@ SECTIONS
 	/* This section might be better named .setup */
 	.rom ROMLOC : {
 		_rom = .;
+		*(.bl1);
+		*(.start);
 		*(.text);
 		*(.text.*);
 		*(.rom.text);