u-boot/arch/arm/mach-stm32mp/dram_init.c
Patrick Delaunay 1419e5b516 stm32mp: update MMU config before the relocation
Mark the top of ram, used for relocated U-Boot as a normal memory
(cacheable and executable) to avoid permission access issue when
U-Boot jumps to this relocated code.

When MMU is activated in pre-reloc stage; only the beginning of
DDR is marked executable.

This patch avoids access issue when DACR is correctly managed.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
2021-03-02 15:53:37 -05:00

62 lines
1.3 KiB
C

// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
/*
* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
*/
#define LOG_CATEGORY LOGC_ARCH
#include <common.h>
#include <dm.h>
#include <image.h>
#include <init.h>
#include <lmb.h>
#include <log.h>
#include <ram.h>
#include <asm/global_data.h>
#include <asm/system.h>
DECLARE_GLOBAL_DATA_PTR;
int dram_init(void)
{
struct ram_info ram;
struct udevice *dev;
int ret;
ret = uclass_get_device(UCLASS_RAM, 0, &dev);
if (ret) {
log_debug("RAM init failed: %d\n", ret);
return ret;
}
ret = ram_get_info(dev, &ram);
if (ret) {
log_debug("Cannot get RAM size: %d\n", ret);
return ret;
}
log_debug("RAM init base=%lx, size=%x\n", ram.base, ram.size);
gd->ram_size = ram.size;
return 0;
}
ulong board_get_usable_ram_top(ulong total_size)
{
phys_size_t size;
phys_addr_t reg;
struct lmb lmb;
/* found enough not-reserved memory to relocated U-Boot */
lmb_init(&lmb);
lmb_add(&lmb, gd->ram_base, gd->ram_size);
boot_fdt_add_mem_rsv_regions(&lmb, (void *)gd->fdt_blob);
size = ALIGN(CONFIG_SYS_MALLOC_LEN + total_size, MMU_SECTION_SIZE),
reg = lmb_alloc(&lmb, size, MMU_SECTION_SIZE);
if (!reg)
reg = gd->ram_top - size;
mmu_set_region_dcache_behaviour(reg, size, DCACHE_DEFAULT_OPTION);
return reg + size;
}