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In case U-Boot runs in EL3, which is the highest privilege level on ARM64, there can be no firmware running that would restrict access to the bottom 128 MiB of DRAM. In fact, it is likely that U-Boot would have to load that firmware into those bottom 128 MiB of DRAM and start that firmware. Make those bottom 128 MiB of DRAM available in case U-Boot runs in EL3 to allow loading the firmware to that area. Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* board/renesas/rcar-common/common.c
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*
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* Copyright (C) 2013 Renesas Electronics Corporation
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* Copyright (C) 2013 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
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* Copyright (C) 2015 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
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*/
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#include <dm.h>
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#include <fdt_support.h>
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#include <hang.h>
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#include <init.h>
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#include <asm/global_data.h>
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#include <asm/io.h>
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#include <dm/uclass-internal.h>
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#include <asm/arch/renesas.h>
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#include <asm/system.h>
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#include <linux/libfdt.h>
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#ifdef CONFIG_RCAR_64
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DECLARE_GLOBAL_DATA_PTR;
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int dram_init(void)
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{
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int ret = fdtdec_setup_mem_size_base();
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if (current_el() == 3 && gd->ram_base == 0x48000000) {
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/*
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* If this U-Boot runs in EL3, make the bottom 128 MiB
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* available for loading of follow up firmware blobs.
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*/
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gd->ram_base -= 0x8000000;
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gd->ram_size += 0x8000000;
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}
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return ret;
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}
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int dram_init_banksize(void)
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{
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int bank;
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fdtdec_setup_memory_banksize();
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if (current_el() != 3)
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return 0;
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for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
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if (gd->bd->bi_dram[bank].start != 0x48000000)
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continue;
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/*
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* If this U-Boot runs in EL3, make the bottom 128 MiB
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* available for loading of follow up firmware blobs.
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*/
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gd->bd->bi_dram[bank].start -= 0x8000000;
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gd->bd->bi_dram[bank].size += 0x8000000;
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break;
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}
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return 0;
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}
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int __weak board_init(void)
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{
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return 0;
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}
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#endif
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