mirror of
https://github.com/AsahiLinux/u-boot
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4ac345220a
Save and use the FDT address provided by TF-A in r2 at boot time (it is NT_FW_CONFIG = Non Trusted Firmware configuration file) Address is saved in save_boot_params(), called by start.S and the used DTB is gd->fdt_blob = board_fdt_blob_setup(). If dtb is not provided or invalid, U-Boot use as fallback the builtin DTB. Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com> Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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/*
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* Copyright (C) 2019, STMicroelectronics - All Rights Reserved
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*/
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#include <common.h>
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#include <asm/sections.h>
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#include <asm/system.h>
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/*
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* Force data-section, as .bss will not be valid
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* when save_boot_params is invoked.
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*/
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static unsigned long nt_fw_dtb __section(".data");
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/*
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* Save the FDT address provided by TF-A in r2 at boot time
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* This function is called from start.S
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*/
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void save_boot_params(unsigned long r0, unsigned long r1, unsigned long r2,
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unsigned long r3)
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{
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nt_fw_dtb = r2;
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save_boot_params_ret();
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}
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/*
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* Use the saved FDT address provided by TF-A at boot time (NT_FW_CONFIG =
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* Non Trusted Firmware configuration file) when the pointer is valid
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*/
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void *board_fdt_blob_setup(void)
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{
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debug("%s: nt_fw_dtb=%lx\n", __func__, nt_fw_dtb);
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/* use external device tree only if address is valid */
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if (nt_fw_dtb >= STM32_DDR_BASE) {
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if (fdt_magic(nt_fw_dtb) == FDT_MAGIC)
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return (void *)nt_fw_dtb;
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debug("%s: DTB not found.\n", __func__);
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}
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debug("%s: fall back to builtin DTB, %p\n", __func__, &_end);
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return (void *)&_end;
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}
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