davinci: da850evm/omapl138-lcdk: Move BSS to SDRAM because SRAM is full

In order to fully support SPL_OF_CONTROL, we need BSS to be a bit
larger. This patch relocates BSS to SDRAM instead of SRAM which
is similar to how ARMv7 boards (like OMAP2+) do it.

This means two new variables are required:
CONFIG_SPL_BSS_START_ADDR  set to DAVINCI_DDR_EMIF_DATA_BASE
CONFIG_SPL_BSS_MAX_SIZE is set to 0x1080000 which is 1 byte
before the location where U-Boot will load.
Signed-off-by: NAdam Ford <aford173@gmail.com>

board/davinci/da8xxevm/u-boot-spl-da850evm.lds

@@ -10,6 +10,9 @@
 MEMORY { .sram : ORIGIN = IMAGE_TEXT_BASE,\
 		LENGTH = CONFIG_SPL_MAX_FOOTPRINT }
 
+MEMORY { .sdram : ORIGIN = CONFIG_SPL_BSS_START_ADDR, \
+                LENGTH = CONFIG_SPL_BSS_MAX_SIZE }
+
 OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm")
 OUTPUT_ARCH(arm)
 ENTRY(_start)
@@ -42,6 +45,15 @@ SECTIONS
 		__rel_dyn_end = .;
 	} >.sram
 
+	__image_copy_end = .;
+
+	.end :
+	{
+		*(.__end)
+	}
+
+	_image_binary_end = .;
+
 	.bss :
 	{
 		. = ALIGN(4);
@@ -49,12 +61,5 @@ SECTIONS
 		*(.bss*)
 		. = ALIGN(4);
 		__bss_end = .;
-	} >.sram
-
-	__image_copy_end = .;
-
-	.end :
-	{
-		*(.__end)
-	}
+	} >.sdram
 }

include/configs/da850evm.h

@@ -48,7 +48,8 @@
 #define PHYS_SDRAM_1		DAVINCI_DDR_EMIF_DATA_BASE /* DDR Start */
 #define PHYS_SDRAM_1_SIZE	(64 << 20) /* SDRAM size 64MB */
 #define CONFIG_MAX_RAM_BANK_SIZE (512 << 20) /* max size from SPRS586*/
-
+#define CONFIG_SPL_BSS_START_ADDR DAVINCI_DDR_EMIF_DATA_BASE
+#define CONFIG_SPL_BSS_MAX_SIZE 0x1080000
 /* memtest start addr */
 #define CONFIG_SYS_MEMTEST_START	(PHYS_SDRAM_1 + 0x2000000)
 

include/configs/omapl138_lcdk.h

@@ -43,6 +43,9 @@
 #define PHYS_SDRAM_1_SIZE	(128 << 20) /* SDRAM size 128MB */
 #define CONFIG_MAX_RAM_BANK_SIZE (512 << 20) /* max size from SPRS586*/
 
+#define CONFIG_SPL_BSS_START_ADDR DAVINCI_DDR_EMIF_DATA_BASE
+#define CONFIG_SPL_BSS_MAX_SIZE 0x1080000
+
 /* memtest start addr */
 #define CONFIG_SYS_MEMTEST_START	(PHYS_SDRAM_1 + 0x2000000)