allwinner: Move the NOBITS region to SRAM A1

This frees up space in SRAM A2 that will be used by the SCP firmware and
SCPI shared memory.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Change-Id: I8ce035257451e2d142666fe0cd045e59d4d57b35

plat/allwinner/common/allwinner-common.mk

@@ -56,6 +56,9 @@ PROGRAMMABLE_RESET_ADDRESS	:=	1
 # Allow mapping read-only data as execute-never.
 SEPARATE_CODE_AND_RODATA	:=	1
 
+# Put NOBITS memory in SRAM A1, overwriting U-Boot's SPL.
+SEPARATE_NOBITS_REGION		:=	1
+
 # BL31 gets loaded alongside BL33 (U-Boot) by U-Boot's SPL
 RESET_TO_BL31			:=	1
 

plat/allwinner/common/include/platform_def.h

 /*
- * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -16,6 +16,10 @@
 #define BL31_BASE			SUNXI_SRAM_A2_BASE
 #define BL31_LIMIT			(SUNXI_SRAM_A2_BASE + SUNXI_SRAM_A2_SIZE)
 
+/* Overwrite U-Boot SPL, but reserve the first page for the SPL header. */
+#define BL31_NOBITS_BASE		(SUNXI_SRAM_A1_BASE + 0x1000)
+#define BL31_NOBITS_LIMIT		(SUNXI_SRAM_A1_BASE + SUNXI_SRAM_A1_SIZE)
+
 /* The traditional U-Boot load address is 160MB into DRAM, so at 0x4a000000 */
 #define PLAT_SUNXI_NS_IMAGE_OFFSET	(SUNXI_DRAM_BASE + (160U << 20))