ARM: socfpga: Enable SPL memory allocation

Enable memory allocation in SPL for preparation to enable FAT
in SPL. Memory allocation is needed by FAT to work properly.

Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>
Reviewed-by: Dinh Nguyen <dinguyen@kernel.org>

include/configs/socfpga_common.h

@@ -226,17 +226,34 @@ unsigned int cm_get_qspi_controller_clk_hz(void);
 /*
  * SPL
  *
- * SRAM Memory layout:
+ * SRAM Memory layout for gen 5:
  *
  * 0xFFFF_0000 ...... Start of SRAM
  * 0xFFFF_xxxx ...... Top of stack (grows down)
  * 0xFFFF_yyyy ...... Malloc area
  * 0xFFFF_zzzz ...... Global Data
  * 0xFFFF_FF00 ...... End of SRAM
+ *
+ * SRAM Memory layout for Arria 10:
+ * 0xFFE0_0000 ...... Start of SRAM (bottom)
+ * 0xFFEx_xxxx ...... Top of stack (grows down to bottom)
+ * 0xFFEy_yyyy ...... Global Data
+ * 0xFFEz_zzzz ...... Malloc area (grows up to top)
+ * 0xFFE3_FFFF ...... End of SRAM (top)
  */
 #define CONFIG_SPL_TEXT_BASE		CONFIG_SYS_INIT_RAM_ADDR
 #define CONFIG_SPL_MAX_SIZE		CONFIG_SYS_INIT_RAM_SIZE
 
+#if defined(CONFIG_TARGET_SOCFPGA_ARRIA10)
+/* SPL memory allocation configuration, this is for FAT implementation */
+#ifndef CONFIG_SYS_SPL_MALLOC_START
+#define CONFIG_SYS_SPL_MALLOC_SIZE	0x00010000
+#define CONFIG_SYS_SPL_MALLOC_START	(CONFIG_SYS_INIT_RAM_SIZE - \
+					 CONFIG_SYS_SPL_MALLOC_SIZE + \
+					 CONFIG_SYS_INIT_RAM_ADDR)
+#endif
+#endif
+
 /* SPL SDMMC boot support */
 #ifdef CONFIG_SPL_MMC_SUPPORT
 #if defined(CONFIG_SPL_FAT_SUPPORT) || defined(CONFIG_SPL_EXT_SUPPORT)
@@ -263,7 +280,11 @@ unsigned int cm_get_qspi_controller_clk_hz(void);
 /*
  * Stack setup
  */
+#if defined(CONFIG_TARGET_SOCFPGA_GEN5)
 #define CONFIG_SPL_STACK		CONFIG_SYS_INIT_SP_ADDR
+#elif defined(CONFIG_TARGET_SOCFPGA_ARRIA10)
+#define CONFIG_SPL_STACK		CONFIG_SYS_SPL_MALLOC_START
+#endif
 
 /* Extra Environment */
 #ifndef CONFIG_SPL_BUILD