1 /* 2 * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com> 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <asm/post.h> 9 #include <asm/arch/qemu.h> 10 11 DECLARE_GLOBAL_DATA_PTR; 12 13 int dram_init(void) 14 { 15 u32 ram; 16 17 outb(HIGH_RAM_ADDR, CMOS_ADDR_PORT); 18 ram = ((u32)inb(CMOS_DATA_PORT)) << 14; 19 outb(LOW_RAM_ADDR, CMOS_ADDR_PORT); 20 ram |= ((u32)inb(CMOS_DATA_PORT)) << 6; 21 ram += 16 * 1024; 22 23 gd->ram_size = ram * 1024; 24 post_code(POST_DRAM); 25 26 return 0; 27 } 28 29 int dram_init_banksize(void) 30 { 31 gd->bd->bi_dram[0].start = 0; 32 gd->bd->bi_dram[0].size = gd->ram_size; 33 34 return 0; 35 } 36 37 /* 38 * This function looks for the highest region of memory lower than 4GB which 39 * has enough space for U-Boot where U-Boot is aligned on a page boundary. 40 * It overrides the default implementation found elsewhere which simply 41 * picks the end of ram, wherever that may be. The location of the stack, 42 * the relocation address, and how far U-Boot is moved by relocation are 43 * set in the global data structure. 44 */ 45 ulong board_get_usable_ram_top(ulong total_size) 46 { 47 return gd->ram_size; 48 } 49