arm: add memory map for DDR region

Summary
  add memory map for DDR region

fix arm-v7a/knsh boot dataabort on arm_addrenv_utils.c first time memset
after arm_pgvaddr.

Signed-off-by: qinwei1 <qinwei1@xiaomi.com>

arch/arm/src/qemu/qemu_memorymap.c

@@ -57,6 +57,10 @@ static const struct section_mapping_s g_section_mapping[] =
     VIRT_PCIE_PSECTION, VIRT_PCIE_VSECTION,
     MMU_IOFLAGS, _NSECTIONS(VIRT_PCIE_SECSIZE)
   },
+  {
+    VIRT_DDR_PSECTION, VIRT_DDR_VSECTION,
+    MMU_MEMFLAGS, _NSECTIONS(VIRT_DDR_SECSIZE)
+  },
 };
 
 /****************************************************************************

arch/arm/src/qemu/qemu_memorymap.h

@@ -42,6 +42,7 @@
 #define VIRT_IO_PSECTION         0x08000000  /* 0x08000000-0x0e000000 */
 #define VIRT_SEC_MEM_PSECTION    0x0e000000  /* 0x0e000000-0x0f000000 */
 #define VIRT_PCIE_PSECTION       0x10000000  /* 0x10000000-0x40000000 */
+#define VIRT_DDR_PSECTION        0x40000000  /* 0x40000000-0x50000000 */
 
 /* Qemu virt Virtual Memory Map *********************************************/
 
@@ -49,6 +50,7 @@
 #define VIRT_IO_VSECTION         VIRT_IO_PSECTION
 #define VIRT_SEC_MEM_VSECTION    VIRT_SEC_MEM_PSECTION
 #define VIRT_PCIE_VSECTION       VIRT_PCIE_PSECTION
+#define VIRT_DDR_VSECTION        VIRT_DDR_PSECTION
 
 /* Sizes of memory regions in bytes. */
 
@@ -56,6 +58,7 @@
 #define VIRT_IO_SECSIZE          (96*1024*1024)
 #define VIRT_SEC_MEM_SECSIZE     (16*1024*1024)
 #define VIRT_PCIE_SECSIZE        (3*256*1024*1024)
+#define VIRT_DDR_SECSIZE         (256*1024*1024)
 
 /****************************************************************************
  * Public Function Prototypes