mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-16 01:38:22 +00:00
3f397782ae
The firmware running on the bcm2835 SoC's VideoCore CPU determines how much of the system RAM is available for use by the ARM CPU. Previously, U-Boot assumed that only 128MB was available, since this was the smallest value configured by any public firmware. However, we can now query the actual value at run-time from the firmware using the mbox property protocol. Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
/*
|
|
* (C) Copyright 2012 Stephen Warren
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/arch/mbox.h>
|
|
#include <asm/global_data.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
struct msg_get_arm_mem {
|
|
struct bcm2835_mbox_hdr hdr;
|
|
struct bcm2835_mbox_tag_get_arm_mem get_arm_mem;
|
|
u32 end_tag;
|
|
};
|
|
|
|
int dram_init(void)
|
|
{
|
|
ALLOC_ALIGN_BUFFER(struct msg_get_arm_mem, msg, 1, 16);
|
|
int ret;
|
|
|
|
BCM2835_MBOX_INIT_HDR(msg);
|
|
BCM2835_MBOX_INIT_TAG(&msg->get_arm_mem, GET_ARM_MEMORY);
|
|
|
|
ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
|
|
if (ret) {
|
|
printf("bcm2835: Could not query ARM memory size\n");
|
|
return -1;
|
|
}
|
|
|
|
gd->ram_size = msg->get_arm_mem.body.resp.mem_size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int board_init(void)
|
|
{
|
|
gd->bd->bi_boot_params = 0x100;
|
|
|
|
return 0;
|
|
}
|