armv7/snow: add BL1_SIZE_KB and get rid of magic constants

This adds a BL1_SIZE_KB config variable so that we can get rid of
some magic constants.

Change-Id: I9dbcfb407d3f8e367be5d943e95b032ce88b0ad0
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/2332
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/arch/armv7/bootblock.inc

@@ -36,7 +36,7 @@ _bl1:
 	 * on ARM, which is 8KB in size and it is prepended to the
 	 * reset vector
 	 */
-	.skip 8192
+	.skip CONFIG_BL1_SIZE_KB
 
 .globl _start
 _start: b	reset

src/arch/armv7/bootblock.lds

@@ -25,7 +25,7 @@ OUTPUT_ARCH(arm)
 TARGET(binary)
 SECTIONS
 {
-	ROMLOC = 0x2023400 - 8192;
+	ROMLOC = CONFIG_BOOTBLOCK_BASE - CONFIG_BL1_SIZE_KB;
 
 	/* This section might be better named .setup */
 	.rom ROMLOC : {

src/cpu/samsung/exynos5250/Kconfig

@@ -14,6 +14,10 @@ config SATA_AHCI
 	bool
 	default n
 
+config BL1_SIZE_KB
+	int
+	default 8192
+
 # Example SRAM/iRAM map for Exynos5250 platform:
 #
 # 0x0202_0000: vendor-provided BL1