tools/rkcommon.c

   1 /*
   2  * (C) Copyright 2015 Google,  Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  *
   7  * Helper functions for Rockchip images
   8  */
   9
  10 #include "imagetool.h"
  11 #include <image.h>
  12 #include <rc4.h>
  13 #include "mkimage.h"
  14 #include "rkcommon.h"
  15
  16 enum {
  17         RK_SIGNATURE            = 0x0ff0aa55,
  18 };
  19
  20 /**
  21  * struct header0_info - header block for boot ROM
  22  *
  23  * This is stored at SD card block 64 (where each block is 512 bytes, or at
  24  * the start of SPI flash. It is encoded with RC4.
  25  *
  26  * @signature:          Signature (must be RKSD_SIGNATURE)
  27  * @disable_rc4:        0 to use rc4 for boot image,  1 to use plain binary
  28  * @init_offset:        Offset in blocks of the SPL code from this header
  29  *                      block. E.g. 4 means 2KB after the start of this header.
  30  * Other fields are not used by U-Boot
  31  */
  32 struct header0_info {
  33         uint32_t signature;
  34         uint8_t reserved[4];
  35         uint32_t disable_rc4;
  36         uint16_t init_offset;
  37         uint8_t reserved1[492];
  38         uint16_t init_size;
  39         uint16_t init_boot_size;
  40         uint8_t reserved2[2];
  41 };
  42
  43 static unsigned char rc4_key[16] = {
  44         124, 78, 3, 4, 85, 5, 9, 7,
  45         45, 44, 123, 56, 23, 13, 23, 17
  46 };
  47
  48 int rkcommon_set_header(void *buf, uint file_size)
  49 {
  50         struct header0_info *hdr;
  51
  52         if (file_size > CONFIG_ROCKCHIP_MAX_SPL_SIZE)
  53                 return -ENOSPC;
  54
  55         memset(buf,  '\0', RK_INIT_OFFSET * RK_BLK_SIZE);
  56         hdr = (struct header0_info *)buf;
  57         hdr->signature = RK_SIGNATURE;
  58         hdr->disable_rc4 = 1;
  59         hdr->init_offset = RK_INIT_OFFSET;
  60
  61         hdr->init_size = (file_size + RK_BLK_SIZE - 1) / RK_BLK_SIZE;
  62         hdr->init_size = (hdr->init_size + 3) & ~3;
  63         hdr->init_boot_size = hdr->init_size + RK_MAX_BOOT_SIZE / RK_BLK_SIZE;
  64
  65         rc4_encode(buf, RK_BLK_SIZE, rc4_key);
  66
  67         return 0;
  68 }