armv7: Reserve space BL1 and checksum header by specifying bootblock offset.

Not all ARM systems need "BL1", and the layout of BL* and bootblock may be
different (ex, Exynos 5250 may use a new BL1 with variable length checksum
header).

To support that better, define the real base address (and ROM offset) of boot
block, and then we can post-processing ROM image file by filling data / checksum
and any other information.

Change-Id: I0e3105e52500b6b457371ad33a9aa546acf28928
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3664
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/arch/armv7/Makefile.inc

@@ -48,7 +48,8 @@ prebuilt-files = $(foreach file,$(cbfs-files), $(call extract_nth,1,$(file)))
 # TODO Change -b to Kconfig variable.
 $(obj)/coreboot.pre: $(objcbfs)/bootblock.bin $(objcbfs)/romstage.elf $$(prebuilt-files) $(CBFSTOOL) $$(cpu_ucode_cbfs_file)
 	$(CBFSTOOL) $@.tmp create -m armv7 -s $(CONFIG_COREBOOT_ROMSIZE_KB)K \
-		-B $(objcbfs)/bootblock.bin -a 64 -b 0x0000 \
+		-B $(objcbfs)/bootblock.bin -a 64 \
+		-b $(CONFIG_BOOTBLOCK_ROM_OFFSET) \
 		-H $(CONFIG_CBFS_HEADER_ROM_OFFSET) \
 		-o $(CONFIG_CBFS_ROM_OFFSET)
 	@printf "    CBFS       $(subst $(obj)/,,$(@))\n"

src/arch/armv7/bootblock.inc

@@ -29,14 +29,6 @@
  * MA 02111-1307 USA
  */
 
-.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
-	 * reset vector
-	 */
-	.skip (CONFIG_BL1_SIZE_KB * 1024)
-
 .section ".start", "a", %progbits
 .globl _start
 _start: b	reset

src/arch/armv7/bootblock.lds

@@ -25,12 +25,11 @@ OUTPUT_ARCH(arm)
 TARGET(binary)
 SECTIONS
 {
-	ROMLOC = CONFIG_BOOTBLOCK_BASE - (CONFIG_BL1_SIZE_KB * 1024);
+	ROMLOC = CONFIG_BOOTBLOCK_BASE;
 
 	/* This section might be better named .setup */
 	.rom ROMLOC : {
 		_rom = .;
-		*(.bl1);
 		*(.start);
 		*(.id);
 		*(.text);