GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/board/imgtec/boston/ddr.c

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2016 Imagination Technologies
+ */
+
+#include <common.h>
+#include <init.h>
+
+#include <asm/io.h>
+
+#include "boston-regs.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int dram_init(void)
+{
+	u32 ddrconf0 = __raw_readl((uint32_t *)BOSTON_PLAT_DDRCONF0);
+
+	gd->ram_size = (phys_size_t)(ddrconf0 & BOSTON_PLAT_DDRCONF0_SIZE) <<
+			30;
+
+	return 0;
+}
+
+ulong board_get_usable_ram_top(ulong total_size)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	if (gd->ram_top < CONFIG_SYS_SDRAM_BASE) {
+		/* 2GB wrapped around to 0 */
+		return CKSEG0ADDR(256 << 20);
+	}
+
+	return min_t(unsigned long, gd->ram_top, CKSEG0ADDR(256 << 20));
+}