diff options
Diffstat (limited to 'arch/x86/cpu/qemu/dram.c')
-rw-r--r-- | arch/x86/cpu/qemu/dram.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/x86/cpu/qemu/dram.c b/arch/x86/cpu/qemu/dram.c new file mode 100644 index 0000000..a88d0d2 --- /dev/null +++ b/arch/x86/cpu/qemu/dram.c @@ -0,0 +1,46 @@ +/* + * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/post.h> +#include <asm/arch/qemu.h> + +DECLARE_GLOBAL_DATA_PTR; + +int dram_init(void) +{ + u32 ram; + + outb(HIGH_RAM_ADDR, CMOS_ADDR_PORT); + ram = ((u32)inb(CMOS_DATA_PORT)) << 14; + outb(LOW_RAM_ADDR, CMOS_ADDR_PORT); + ram |= ((u32)inb(CMOS_DATA_PORT)) << 6; + ram += 16 * 1024; + + gd->ram_size = ram * 1024; + post_code(POST_DRAM); + + return 0; +} + +void dram_init_banksize(void) +{ + gd->bd->bi_dram[0].start = 0; + gd->bd->bi_dram[0].size = gd->ram_size; +} + +/* + * This function looks for the highest region of memory lower than 4GB which + * has enough space for U-Boot where U-Boot is aligned on a page boundary. + * It overrides the default implementation found elsewhere which simply + * picks the end of ram, wherever that may be. The location of the stack, + * the relocation address, and how far U-Boot is moved by relocation are + * set in the global data structure. + */ +ulong board_get_usable_ram_top(ulong total_size) +{ + return gd->ram_size; +} |