1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
8 #include <asm/arch/qemu.h>
10 DECLARE_GLOBAL_DATA_PTR;
12 u32 qemu_get_low_memory_size(void)
16 outb(HIGH_RAM_ADDR, CMOS_ADDR_PORT);
17 ram = ((u32)inb(CMOS_DATA_PORT)) << 14;
18 outb(LOW_RAM_ADDR, CMOS_ADDR_PORT);
19 ram |= ((u32)inb(CMOS_DATA_PORT)) << 6;
27 gd->ram_size = qemu_get_low_memory_size();
33 int dram_init_banksize(void)
35 gd->bd->bi_dram[0].start = 0;
36 gd->bd->bi_dram[0].size = gd->ram_size;
42 * This function looks for the highest region of memory lower than 4GB which
43 * has enough space for U-Boot where U-Boot is aligned on a page boundary.
44 * It overrides the default implementation found elsewhere which simply
45 * picks the end of ram, wherever that may be. The location of the stack,
46 * the relocation address, and how far U-Boot is moved by relocation are
47 * set in the global data structure.
49 ulong board_get_usable_ram_top(ulong total_size)