board/raspberrypi/rpi/lowlevel_init.S

   1 /*
   2  * (C) Copyright 2016
   3  * Cédric Schieli <cschieli@gmail.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <config.h>
   9
  10 .align 8
  11 .global fw_dtb_pointer
  12 fw_dtb_pointer:
  13 #ifdef CONFIG_ARM64
  14         .dword 0x0
  15 #else
  16         .word 0x0
  17 #endif
  18
  19 /*
  20  * Routine: save_boot_params (called after reset from start.S)
  21  * Description: save ATAG/FDT address provided by the firmware at boot time
  22  */
  23
  24 .global save_boot_params
  25 save_boot_params:
  26
  27         /* The firmware provided ATAG/FDT address can be found in r2/x0 */
  28 #ifdef CONFIG_ARM64
  29         adr     x8, fw_dtb_pointer
  30         str     x0, [x8]
  31 #else
  32         str     r2, fw_dtb_pointer
  33 #endif
  34
  35         /* Returns */
  36         b       save_boot_params_ret