LXR uboot/arch/arm/mach-stm32mp/boot

   1// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
   2/*
   3 * Copyright (C) 2019, STMicroelectronics - All Rights Reserved
   4 */
   5
   6#include <common.h>
   7#include <log.h>
   8#include <asm/sections.h>
   9#include <asm/system.h>
  10
  11/*
  12 * Force data-section, as .bss will not be valid
  13 * when save_boot_params is invoked.
  14 */
  15static unsigned long nt_fw_dtb __section(".data");
  16
  17/*
  18 * Save the FDT address provided by TF-A in r2 at boot time
  19 * This function is called from start.S
  20 */
  21void save_boot_params(unsigned long r0, unsigned long r1, unsigned long r2,
  22                      unsigned long r3)
  23{
  24        nt_fw_dtb = r2;
  25
  26        save_boot_params_ret();
  27}
  28
  29/*
  30 * Use the saved FDT address provided by TF-A at boot time (NT_FW_CONFIG =
  31 * Non Trusted Firmware configuration file) when the pointer is valid
  32 */
  33void *board_fdt_blob_setup(void)
  34{
  35        debug("%s: nt_fw_dtb=%lx\n", __func__, nt_fw_dtb);
  36
  37        /* use external device tree only if address is valid */
  38        if (nt_fw_dtb >= STM32_DDR_BASE) {
  39                if (fdt_magic(nt_fw_dtb) == FDT_MAGIC)
  40                        return (void *)nt_fw_dtb;
  41                debug("%s: DTB not found.\n", __func__);
  42        }
  43        debug("%s: fall back to builtin DTB, %p\n", __func__, &_end);
  44
  45        return (void *)&_end;
  46}
  47