ARMv7/Exynos: Fix memory location assumptions

This patch cleans out a lot of unused variables in the
ARM Kconfig files and introduces CONFIG_RAMSTAGE_BASE
which is similar to CONFIG_RAMBASE on x86.
This gets rid of the hard coded assumption that on ARM
coreboot is always executed at the lowest DRAM address.
But in fact, this might not be true because we might want
coreboot to live at the end of RAM, or in SRAM

Change-Id: I03e992645f9eb730e39a521aa21f702959311f74
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: https://chromium-review.googlesource.com/168645
Reviewed-by: David Hendrix <dhendrix@chromium.org>
Tested-by: David Hendrix <dhendrix@chromium.org>
(cherry picked from commit 15b87892eb2d5e27759c49dc6c8c7e626f651d77)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6634
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/arch/armv7/ramstage.ld

@@ -1,7 +1,7 @@
 /*
  *	Memory map:
  *
- *	CONFIG_RAMBASE		: text segment
+ *	CONFIG_RAMSTAGE_BASE	: text segment
  *				: rodata segment
  *				: data segment
  *				: bss segment
@@ -31,7 +31,7 @@ PHDRS
 
 SECTIONS
 {
-	. = CONFIG_SYS_SDRAM_BASE;
+	. = CONFIG_RAMSTAGE_BASE;
 	/* First we place the code and read only data (typically const declared).
 	 * This could theoretically be placed in rom.
 	 */
@@ -111,9 +111,6 @@ SECTIONS
         }
         _eheap = .;
 
-	_stack = CONFIG_STACK_BOTTOM;
-	_estack = CONFIG_STACK_TOP;
-
 	/* The ram segment. This includes all memory used by the memory
 	 * resident copy of coreboot, except the tables that are produced on
 	 * the fly, but including stack and heap.
@@ -121,6 +118,12 @@ SECTIONS
 	_ram_seg = _text;
 	_eram_seg = _eheap;
 
+	/* The stack lives in SRAM in a different location, so keep
+	 * it out of ram_seg
+	 */
+	_stack = CONFIG_STACK_BOTTOM;
+	_estack = CONFIG_STACK_TOP;
+
 	/* Discard the sections we don't need/want */
 
 	/DISCARD/ : {

src/arch/armv7/romstage.ld

@@ -1,7 +1,7 @@
 /*
  *	Memory map:
  *
- *	CONFIG_RAMBASE		: text segment
+ *	CONFIG_ROMSTAGE_BASE	: text segment
  *				: rodata segment
  *				: data segment
  *				: bss segment

src/cpu/samsung/exynos5250/Kconfig

@@ -38,6 +38,9 @@ config CBFS_ROM_OFFSET
 	hex "offset of CBFS data in ROM"
 	default 0x0A000
 
+config SYS_SDRAM_BASE
+	hex
+	default 0x40000000
 
 # Example SRAM/iRAM map for Exynos5250 platform:
 #
@@ -54,9 +57,9 @@ config ROMSTAGE_BASE
 	hex
 	default 0x02030000
 
-config ROMSTAGE_SIZE
+config RAMSTAGE_BASE
 	hex
-	default 0x10000
+	default SYS_SDRAM_BASE
 
 # Stack may reside in either IRAM or DRAM. We will define it to live
 # at the top of IRAM for now.
@@ -90,12 +93,4 @@ config TTB_BUFFER
 	hex "memory address of the TTB buffer"
 	default 0x02058000
 
-config TTB_SIZE
-	hex "size of the TTB buffer"
-	default 0x4000
-
-config SYS_SDRAM_BASE
-	hex
-	default 0x40000000
-
 endif

src/cpu/samsung/exynos5420/Kconfig

@@ -40,6 +40,9 @@ config CBFS_ROM_OFFSET
 	hex "offset of CBFS data in ROM"
 	default 0x0A000
 
+config SYS_SDRAM_BASE
+	hex
+	default 0x20000000
 
 # Example SRAM/iRAM map for Exynos5420 platform:
 #
@@ -63,9 +66,9 @@ config ROMSTAGE_BASE
 	hex
 	default 0x02030000
 
-config ROMSTAGE_SIZE
+config RAMSTAGE_BASE
 	hex
-	default 0x20000
+	default SYS_SDRAM_BASE
 
 # Stack may reside in either IRAM or DRAM. We will define it to live
 # at the top of IRAM for now.
@@ -90,11 +93,6 @@ config STACK_BOTTOM
 	hex
 	default 0x0206f000
 
-# The romstage stack must be large enough to contain the lzma buffer
-config ROMSTAGE_STACK_SIZE
-	hex
-	default 0x4000
-
 # STACK_SIZE is for the ramstage core and thread stacks.
 # It must be a power of 2, to make the cpu_info computation work,
 # and cpu_info needs to work to make SMP startup and threads work.
@@ -116,12 +114,4 @@ config TTB_BUFFER
 	hex "memory address of the TTB buffer"
 	default 0x02058000
 
-config TTB_SIZE
-	hex "size of the TTB buffer"
-	default 0x4000
-
-config SYS_SDRAM_BASE
-	hex
-	default 0x20000000
-
 endif

src/mainboard/emulation/qemu-armv7/Kconfig

@@ -33,7 +33,7 @@ config MAINBOARD_DIR
 
 config MAINBOARD_PART_NUMBER
 	string
-	default "QEMU ARMV7"
+	default "QEMU ARMv7"
 
 config MAX_CPUS
 	int
@@ -43,6 +43,10 @@ config MAINBOARD_VENDOR
 	string
 	default "ARM Ltd."
 
+config SYS_SDRAM_BASE
+	hex "SDRAM base address"
+	default 0x01000000
+
 config DRAM_SIZE_MB
 	int
 	default 1024
@@ -62,17 +66,13 @@ config BOOTBLOCK_BASE
 	hex
 	default 0x00010000
 
-config ID_SECTION_BASE
-	hex
-	default 0x0001f000
-
 config ROMSTAGE_BASE
 	hex
 	default 0x00020000
 
-config ROMSTAGE_SIZE
+config RAMSTAGE_BASE
 	hex
-	default 0x20000
+	default SYS_SDRAM_BASE
 
 config BOOTBLOCK_ROM_OFFSET
 	hex
@@ -98,8 +98,4 @@ config STACK_SIZE
 	hex
 	default 0x0003ff00
 
-config SYS_SDRAM_BASE
-	hex "SDRAM base address"
-	default 0x01000000
-
 endif #  BOARD_EMULATION_QEMU_ARMV7