tricorder: support 256MiB SDRAM on revision > D

Signed-off-by: Andreas Bießmann <andreas.biessmann@corscience.de>
diff --git a/include/configs/tricorder.h b/include/configs/tricorder.h
index aab1bf1..ac9a1dd 100644
--- a/include/configs/tricorder.h
+++ b/include/configs/tricorder.h
@@ -354,7 +354,7 @@
 #define CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR 0x300 /* address 0x60000 */
 
 #define CONFIG_SPL_TEXT_BASE		0x40200000 /*CONFIG_SYS_SRAM_START*/
-#define CONFIG_SPL_MAX_SIZE		(55 * 1024)	/* 7 KB for stack */
+#define CONFIG_SPL_MAX_SIZE		(57 * 1024)	/* 7 KB for stack */
 #define CONFIG_SPL_STACK		LOW_LEVEL_SRAM_STACK
 
 #define CONFIG_SPL_BSS_START_ADDR	0x80000000 /*CONFIG_SYS_SDRAM_BASE*/