lib_microblaze/microblaze_linux.c

   1 /*
   2  * (C) Copyright 2007 Michal Simek
   3  * (C) Copyright 2004 Atmark Techno, Inc.
   4  *
   5  * Michal  SIMEK <monstr@monstr.eu>
   6  * Yasushi SHOJI <yashi@atmark-techno.com>
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <image.h>
  30 #include <zlib.h>
  31 #include <asm/byteorder.h>
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 #ifdef CONFIG_SHOW_BOOT_PROGRESS
  36 # include <status_led.h>
  37 # define SHOW_BOOT_PROGRESS(arg)        show_boot_progress(arg)
  38 #else
  39 # define SHOW_BOOT_PROGRESS(arg)
  40 #endif
  41
  42 extern image_header_t header;   /* from cmd_bootm.c */
  43 /*cmd_boot.c*/
  44 extern int do_reset (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]);
  45
  46 void do_bootm_linux (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[],
  47                      ulong addr, ulong * len_ptr, int verify)
  48 {
  49         ulong len = 0, checksum;
  50         ulong initrd_start, initrd_end;
  51         ulong data;
  52         /* First parameter is mapped to $r5 for kernel boot args */
  53         void (*theKernel) (char *);
  54         image_header_t *hdr = &header;
  55         char *commandline = getenv ("bootargs");
  56         int i;
  57
  58         theKernel = (void (*)(char *))ntohl (hdr->ih_ep);
  59
  60         /* Check if there is an initrd image */
  61         if (argc >= 3) {
  62                 SHOW_BOOT_PROGRESS (9);
  63
  64                 addr = simple_strtoul (argv[2], NULL, 16);
  65
  66                 printf ("## Loading Ramdisk Image at %08lx ...\n", addr);
  67
  68                 /* Copy header so we can blank CRC field for re-calculation */
  69                 memcpy (&header, (char *)addr, sizeof (image_header_t));
  70
  71                 if (ntohl (hdr->ih_magic) != IH_MAGIC) {
  72                         printf ("Bad Magic Number\n");
  73                         SHOW_BOOT_PROGRESS (-10);
  74                         do_reset (cmdtp, flag, argc, argv);
  75                 }
  76
  77                 data = (ulong) & header;
  78                 len = sizeof (image_header_t);
  79
  80                 checksum = ntohl (hdr->ih_hcrc);
  81                 hdr->ih_hcrc = 0;
  82
  83                 if (crc32 (0, (char *)data, len) != checksum) {
  84                         printf ("Bad Header Checksum\n");
  85                         SHOW_BOOT_PROGRESS (-11);
  86                         do_reset (cmdtp, flag, argc, argv);
  87                 }
  88
  89                 SHOW_BOOT_PROGRESS (10);
  90
  91                 print_image_hdr (hdr);
  92
  93                 data = addr + sizeof (image_header_t);
  94                 len = ntohl (hdr->ih_size);
  95
  96                 if (verify) {
  97                         ulong csum = 0;
  98
  99                         printf ("   Verifying Checksum ... ");
 100                         csum = crc32 (0, (char *)data, len);
 101                         if (csum != ntohl (hdr->ih_dcrc)) {
 102                                 printf ("Bad Data CRC\n");
 103                                 SHOW_BOOT_PROGRESS (-12);
 104                                 do_reset (cmdtp, flag, argc, argv);
 105                         }
 106                         printf ("OK\n");
 107                 }
 108
 109                 SHOW_BOOT_PROGRESS (11);
 110
 111                 if ((hdr->ih_os != IH_OS_LINUX) ||
 112                     (hdr->ih_arch != IH_CPU_MICROBLAZE) ||
 113                     (hdr->ih_type != IH_TYPE_RAMDISK)) {
 114                         printf ("No Linux Microblaze Ramdisk Image\n");
 115                         SHOW_BOOT_PROGRESS (-13);
 116                         do_reset (cmdtp, flag, argc, argv);
 117                 }
 118
 119                 /*
 120                  * Now check if we have a multifile image
 121                  */
 122         } else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
 123                 ulong tail = ntohl (len_ptr[0]) % 4;
 124
 125                 SHOW_BOOT_PROGRESS (13);
 126
 127                 /* skip kernel length and terminator */
 128                 data = (ulong) (&len_ptr[2]);
 129                 /* skip any additional image length fields */
 130                 for (i = 1; len_ptr[i]; ++i)
 131                         data += 4;
 132                 /* add kernel length, and align */
 133                 data += ntohl (len_ptr[0]);
 134                 if (tail) {
 135                         data += 4 - tail;
 136                 }
 137
 138                 len = ntohl (len_ptr[1]);
 139
 140         } else {
 141                 /*
 142                  * no initrd image
 143                  */
 144                 SHOW_BOOT_PROGRESS (14);
 145
 146                 data = 0;
 147         }
 148
 149 #ifdef  DEBUG
 150         if (!data) {
 151                 printf ("No initrd\n");
 152         }
 153 #endif
 154
 155         if (data) {
 156                 initrd_start = data;
 157                 initrd_end = initrd_start + len;
 158         } else {
 159                 initrd_start = 0;
 160                 initrd_end = 0;
 161         }
 162
 163         SHOW_BOOT_PROGRESS (15);
 164
 165 #ifdef DEBUG
 166         printf ("## Transferring control to Linux (at address %08lx) ...\n",
 167                 (ulong) theKernel);
 168 #endif
 169
 170         theKernel (commandline);
 171 }