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https://github.com/smaeul/u-boot.git
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1419e5b516
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>
63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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/*
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* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
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*/
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#define LOG_CATEGORY LOGC_ARCH
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#include <common.h>
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#include <dm.h>
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#include <image.h>
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#include <init.h>
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#include <lmb.h>
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#include <log.h>
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#include <ram.h>
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#include <asm/global_data.h>
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#include <asm/system.h>
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DECLARE_GLOBAL_DATA_PTR;
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int dram_init(void)
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{
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struct ram_info ram;
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struct udevice *dev;
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int ret;
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ret = uclass_get_device(UCLASS_RAM, 0, &dev);
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if (ret) {
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log_debug("RAM init failed: %d\n", ret);
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return ret;
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}
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ret = ram_get_info(dev, &ram);
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if (ret) {
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log_debug("Cannot get RAM size: %d\n", ret);
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return ret;
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}
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log_debug("RAM init base=%lx, size=%x\n", ram.base, ram.size);
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gd->ram_size = ram.size;
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return 0;
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}
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ulong board_get_usable_ram_top(ulong total_size)
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{
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phys_size_t size;
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phys_addr_t reg;
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struct lmb lmb;
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/* found enough not-reserved memory to relocated U-Boot */
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lmb_init(&lmb);
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lmb_add(&lmb, gd->ram_base, gd->ram_size);
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boot_fdt_add_mem_rsv_regions(&lmb, (void *)gd->fdt_blob);
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size = ALIGN(CONFIG_SYS_MALLOC_LEN + total_size, MMU_SECTION_SIZE),
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reg = lmb_alloc(&lmb, size, MMU_SECTION_SIZE);
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if (!reg)
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reg = gd->ram_top - size;
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mmu_set_region_dcache_behaviour(reg, size, DCACHE_DEFAULT_OPTION);
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return reg + size;
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}
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