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- // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
- /*
- * Copyright (C) 2019, STMicroelectronics - All Rights Reserved
- */
- #define LOG_CATEGORY LOGC_ARCH
- #include <common.h>
- #include <log.h>
- #include <linux/libfdt.h>
- #include <asm/sections.h>
- #include <asm/system.h>
- /*
- * Force data-section, as .bss will not be valid
- * when save_boot_params is invoked.
- */
- static unsigned long nt_fw_dtb __section(".data");
- /*
- * Save the FDT address provided by TF-A in r2 at boot time
- * This function is called from start.S
- */
- void save_boot_params(unsigned long r0, unsigned long r1, unsigned long r2,
- unsigned long r3)
- {
- nt_fw_dtb = r2;
- save_boot_params_ret();
- }
- /*
- * Use the saved FDT address provided by TF-A at boot time (NT_FW_CONFIG =
- * Non Trusted Firmware configuration file) when the pointer is valid
- */
- void *board_fdt_blob_setup(int *err)
- {
- log_debug("%s: nt_fw_dtb=%lx\n", __func__, nt_fw_dtb);
- *err = 0;
- /* use external device tree only if address is valid */
- if (nt_fw_dtb >= STM32_DDR_BASE) {
- if (fdt_magic(nt_fw_dtb) == FDT_MAGIC)
- return (void *)nt_fw_dtb;
- log_debug("%s: DTB not found.\n", __func__);
- }
- log_debug("%s: fall back to builtin DTB, %p\n", __func__, &_end);
- return (void *)&_end;
- }
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