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

source/bootloader/u-boot-2020.01/arch/arm/mach-imx/mx5/mx53_dram.c

@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017  Beckhoff Automation GmbH & Co. KG
+ * Patrick Bruenn <p.bruenn@beckhoff.com>
+ */
+
+#include <common.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+phys_size_t get_effective_memsize(void)
+{
+	/*
+	 * WARNING: We must override get_effective_memsize() function here
+	 * to report only the size of the first DRAM bank. This is to make
+	 * U-Boot relocator place U-Boot into valid memory, that is, at the
+	 * end of the first DRAM bank. If we did not override this function
+	 * like so, U-Boot would be placed at the address of the first DRAM
+	 * bank + total DRAM size - sizeof(uboot), which in the setup where
+	 * each DRAM bank contains 512MiB of DRAM would result in placing
+	 * U-Boot into invalid memory area close to the end of the first
+	 * DRAM bank.
+	 */
+	return get_ram_size((void *)PHYS_SDRAM_1, 1 << 30);
+}
+
+int dram_init(void)
+{
+	gd->ram_size = get_ram_size((void *)PHYS_SDRAM_1, 1 << 30);
+	gd->ram_size += get_ram_size((void *)PHYS_SDRAM_2, 1 << 30);
+
+	return 0;
+}
+
+int dram_init_banksize(void)
+{
+	gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
+	gd->bd->bi_dram[0].size = get_ram_size((void *)PHYS_SDRAM_1, 1 << 30);
+
+	gd->bd->bi_dram[1].start = PHYS_SDRAM_2;
+	gd->bd->bi_dram[1].size = get_ram_size((void *)PHYS_SDRAM_2, 1 << 30);
+
+	return 0;
+}