1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com> 3*4882a593Smuzhiyun * 4*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun 7*4882a593Smuzhiyun #include <common.h> 8*4882a593Smuzhiyun #include <asm/post.h> 9*4882a593Smuzhiyun #include <asm/arch/qemu.h> 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun DECLARE_GLOBAL_DATA_PTR; 12*4882a593Smuzhiyun dram_init(void)13*4882a593Smuzhiyunint dram_init(void) 14*4882a593Smuzhiyun { 15*4882a593Smuzhiyun u32 ram; 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun outb(HIGH_RAM_ADDR, CMOS_ADDR_PORT); 18*4882a593Smuzhiyun ram = ((u32)inb(CMOS_DATA_PORT)) << 14; 19*4882a593Smuzhiyun outb(LOW_RAM_ADDR, CMOS_ADDR_PORT); 20*4882a593Smuzhiyun ram |= ((u32)inb(CMOS_DATA_PORT)) << 6; 21*4882a593Smuzhiyun ram += 16 * 1024; 22*4882a593Smuzhiyun 23*4882a593Smuzhiyun gd->ram_size = ram * 1024; 24*4882a593Smuzhiyun post_code(POST_DRAM); 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun return 0; 27*4882a593Smuzhiyun } 28*4882a593Smuzhiyun dram_init_banksize(void)29*4882a593Smuzhiyunint dram_init_banksize(void) 30*4882a593Smuzhiyun { 31*4882a593Smuzhiyun gd->bd->bi_dram[0].start = 0; 32*4882a593Smuzhiyun gd->bd->bi_dram[0].size = gd->ram_size; 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun return 0; 35*4882a593Smuzhiyun } 36*4882a593Smuzhiyun 37*4882a593Smuzhiyun /* 38*4882a593Smuzhiyun * This function looks for the highest region of memory lower than 4GB which 39*4882a593Smuzhiyun * has enough space for U-Boot where U-Boot is aligned on a page boundary. 40*4882a593Smuzhiyun * It overrides the default implementation found elsewhere which simply 41*4882a593Smuzhiyun * picks the end of ram, wherever that may be. The location of the stack, 42*4882a593Smuzhiyun * the relocation address, and how far U-Boot is moved by relocation are 43*4882a593Smuzhiyun * set in the global data structure. 44*4882a593Smuzhiyun */ board_get_usable_ram_top(ulong total_size)45*4882a593Smuzhiyunulong board_get_usable_ram_top(ulong total_size) 46*4882a593Smuzhiyun { 47*4882a593Smuzhiyun return gd->ram_size; 48*4882a593Smuzhiyun } 49