mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
a65b25d148
This commit introduces the initial U-Boot support for QEMU x86 targets. U-Boot can boot from coreboot as a payload, or directly without coreboot. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> Merged in patch 'x86: qemu: Add CMD_NET to qemu-x86_defconfig https://patchwork.ozlabs.org/patch/479745/
47 lines
1.0 KiB
C
47 lines
1.0 KiB
C
/*
|
|
* 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;
|
|
}
|