axs101: bump DDR size from 256 to 512 Mb

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
diff --git a/include/configs/axs101.h b/include/configs/axs101.h
index 8d03110..c22d6d0 100644
--- a/include/configs/axs101.h
+++ b/include/configs/axs101.h
@@ -16,7 +16,7 @@
 #define CONFIG_SYS_CLK_FREQ		750000000
 #define CONFIG_SYS_TIMER_RATE		CONFIG_SYS_CLK_FREQ
 
-/* dwgmac doesn't work with D$ enabled now */
+/* NAND controller DMA doesn't work correctly with D$ enabled */
 #define CONFIG_SYS_DCACHE_OFF
 
 /*
@@ -40,7 +40,7 @@
 
 #define CONFIG_SYS_DDR_SDRAM_BASE	0x80000000
 #define CONFIG_SYS_SDRAM_BASE		CONFIG_SYS_DDR_SDRAM_BASE
-#define CONFIG_SYS_SDRAM_SIZE		0x10000000	/* 256 Mb */
+#define CONFIG_SYS_SDRAM_SIZE		0x20000000	/* 512 Mb */
 
 #define CONFIG_SYS_INIT_SP_ADDR		\
 	(CONFIG_SYS_SDRAM_BASE + 0x1000 - GENERATED_GBL_DATA_SIZE)