board/karo/txsd/head.S

   1 /*
   2  * ARM64 header for proper chain-loading with Little Kernel.
   3  *
   4  * (C) 2017 Lothar Waßmann <LW@KARO-electronics.de>
   5  *   based on board/qualcomm/dragonboard410c/head.S
   6  *     (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
   7  *
   8  * Little Kernel shipped with Dragonboard410C boots standard Linux images for
   9  * ARM64. This file adds header that is required to boot U-Boot properly.
  10  *
  11  * For details see:
  12  * https://www.kernel.org/doc/Documentation/arm64/booting.txt
  13  *
  14  * SPDX-License-Identifier:     GPL-2.0+
  15  */
  16
  17 #include <config.h>
  18
  19 .global _arm64_header
  20 _arm64_header:
  21         b _start
  22         .word 0
  23         /* Image load offset from start of RAM, little-endian */
  24         .quad   CONFIG_SYS_TEXT_BASE - PHYS_SDRAM_1
  25         /* Effective size of kernel image, little-endian */
  26         .quad   0 /* 0x60000 - ignored */
  27         /* Informative flags, little-endian */
  28         .quad   0
  29         .quad   0                               /* reserved */
  30         .quad   0                               /* reserved */
  31         .quad   0                               /* reserved */
  32         .byte   'A','R','M','d'                 /* Magic number, "ARM\x64" */
  33         .word   0                               /* reserved */