// 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; }