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