lib_arm/armlinux.c

   1 /*
   2  * (C) Copyright 2002
   3  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   4  * Marius Groeger <mgroeger@sysgo.de>
   5  *
   6  * Copyright (C) 2001  Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <common.h>
  25 #include <command.h>
  26 #include <image.h>
  27 #include <zlib.h>
  28 #include <asm/byteorder.h>
  29 #ifdef CONFIG_HAS_DATAFLASH
  30 #include <dataflash.h>
  31 #endif
  32
  33 /*cmd_boot.c*/
  34 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
  35
  36 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
  37     defined (CONFIG_CMDLINE_TAG) || \
  38     defined (CONFIG_INITRD_TAG) || \
  39     defined (CONFIG_SERIAL_TAG) || \
  40     defined (CONFIG_REVISION_TAG) || \
  41     defined (CONFIG_VFD)
  42 static void setup_start_tag (bd_t *bd);
  43
  44 # ifdef CONFIG_SETUP_MEMORY_TAGS
  45 static void setup_memory_tags (bd_t *bd);
  46 # endif
  47 static void setup_commandline_tag (bd_t *bd, char *commandline);
  48
  49 #if 0
  50 static void setup_ramdisk_tag (bd_t *bd);
  51 #endif
  52 # ifdef CONFIG_INITRD_TAG
  53 static void setup_initrd_tag (bd_t *bd, ulong initrd_start,
  54                               ulong initrd_end);
  55 # endif
  56 static void setup_end_tag (bd_t *bd);
  57
  58 # if defined (CONFIG_VFD)
  59 static void setup_videolfb_tag (gd_t *gd);
  60 # endif
  61
  62
  63 static struct tag *params;
  64 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
  65
  66 #ifdef CONFIG_SHOW_BOOT_PROGRESS
  67 # include <status_led.h>
  68 # define SHOW_BOOT_PROGRESS(arg)        show_boot_progress(arg)
  69 #else
  70 # define SHOW_BOOT_PROGRESS(arg)
  71 #endif
  72
  73 extern image_header_t header;   /* from cmd_bootm.c */
  74
  75
  76 void do_bootm_linux (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
  77                      ulong addr, ulong *len_ptr, int verify)
  78 {
  79         DECLARE_GLOBAL_DATA_PTR;
  80
  81         ulong len = 0, checksum;
  82         ulong initrd_start, initrd_end;
  83         ulong data;
  84         void (*theKernel)(int zero, int arch, uint params);
  85         image_header_t *hdr = &header;
  86         bd_t *bd = gd->bd;
  87
  88 #ifdef CONFIG_CMDLINE_TAG
  89         char *commandline = getenv ("bootargs");
  90 #endif
  91
  92         theKernel = (void (*)(int, int, uint))ntohl(hdr->ih_ep);
  93
  94         /*
  95          * Check if there is an initrd image
  96          */
  97         if (argc >= 3) {
  98                 SHOW_BOOT_PROGRESS (9);
  99
 100                 addr = simple_strtoul (argv[2], NULL, 16);
 101
 102                 printf ("## Loading Ramdisk Image at %08lx ...\n", addr);
 103
 104                 /* Copy header so we can blank CRC field for re-calculation */
 105 #ifdef CONFIG_HAS_DATAFLASH
 106                 if (addr_dataflash (addr)) {
 107                         read_dataflash (addr, sizeof (image_header_t),
 108                                         (char *) &header);
 109                 } else
 110 #endif
 111                         memcpy (&header, (char *) addr,
 112                                 sizeof (image_header_t));
 113
 114                 if (ntohl (hdr->ih_magic) != IH_MAGIC) {
 115                         printf ("Bad Magic Number\n");
 116                         SHOW_BOOT_PROGRESS (-10);
 117                         do_reset (cmdtp, flag, argc, argv);
 118                 }
 119
 120                 data = (ulong) & header;
 121                 len = sizeof (image_header_t);
 122
 123                 checksum = ntohl (hdr->ih_hcrc);
 124                 hdr->ih_hcrc = 0;
 125
 126                 if (crc32 (0, (char *) data, len) != checksum) {
 127                         printf ("Bad Header Checksum\n");
 128                         SHOW_BOOT_PROGRESS (-11);
 129                         do_reset (cmdtp, flag, argc, argv);
 130                 }
 131
 132                 SHOW_BOOT_PROGRESS (10);
 133
 134                 print_image_hdr (hdr);
 135
 136                 data = addr + sizeof (image_header_t);
 137                 len = ntohl (hdr->ih_size);
 138
 139 #ifdef CONFIG_HAS_DATAFLASH
 140                 if (addr_dataflash (addr)) {
 141                         read_dataflash (data, len, (char *) CFG_LOAD_ADDR);
 142                         data = CFG_LOAD_ADDR;
 143                 }
 144 #endif
 145
 146                 if (verify) {
 147                         ulong csum = 0;
 148
 149                         printf ("   Verifying Checksum ... ");
 150                         csum = crc32 (0, (char *) data, len);
 151                         if (csum != ntohl (hdr->ih_dcrc)) {
 152                                 printf ("Bad Data CRC\n");
 153                                 SHOW_BOOT_PROGRESS (-12);
 154                                 do_reset (cmdtp, flag, argc, argv);
 155                         }
 156                         printf ("OK\n");
 157                 }
 158
 159                 SHOW_BOOT_PROGRESS (11);
 160
 161                 if ((hdr->ih_os != IH_OS_LINUX) ||
 162                     (hdr->ih_arch != IH_CPU_ARM) ||
 163                     (hdr->ih_type != IH_TYPE_RAMDISK)) {
 164                         printf ("No Linux ARM Ramdisk Image\n");
 165                         SHOW_BOOT_PROGRESS (-13);
 166                         do_reset (cmdtp, flag, argc, argv);
 167                 }
 168
 169                 /*
 170                  * Now check if we have a multifile image
 171                  */
 172         } else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
 173                 ulong tail = ntohl (len_ptr[0]) % 4;
 174                 int i;
 175
 176                 SHOW_BOOT_PROGRESS (13);
 177
 178                 /* skip kernel length and terminator */
 179                 data = (ulong) (&len_ptr[2]);
 180                 /* skip any additional image length fields */
 181                 for (i = 1; len_ptr[i]; ++i)
 182                         data += 4;
 183                 /* add kernel length, and align */
 184                 data += ntohl (len_ptr[0]);
 185                 if (tail) {
 186                         data += 4 - tail;
 187                 }
 188
 189                 len = ntohl (len_ptr[1]);
 190
 191         } else {
 192                 /*
 193                  * no initrd image
 194                  */
 195                 SHOW_BOOT_PROGRESS (14);
 196
 197                 len = data = 0;
 198         }
 199
 200 #ifdef  DEBUG
 201         if (!data) {
 202                 printf ("No initrd\n");
 203         }
 204 #endif
 205
 206         if (data) {
 207                 initrd_start = data;
 208                 initrd_end = initrd_start + len;
 209         } else {
 210                 initrd_start = 0;
 211                 initrd_end = 0;
 212         }
 213
 214         SHOW_BOOT_PROGRESS (15);
 215
 216         debug ("## Transferring control to Linux (at address %08lx) ...\n",
 217                (ulong) theKernel);
 218
 219 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
 220     defined (CONFIG_CMDLINE_TAG) || \
 221     defined (CONFIG_INITRD_TAG) || \
 222     defined (CONFIG_SERIAL_TAG) || \
 223     defined (CONFIG_REVISION_TAG) || \
 224     defined (CONFIG_VFD)
 225         setup_start_tag (bd);
 226 #ifdef CONFIG_SERIAL_TAG
 227         setup_serial_tag (&params);
 228 #endif
 229 #ifdef CONFIG_REVISION_TAG
 230         setup_revision_tag (&params);
 231 #endif
 232 #ifdef CONFIG_SETUP_MEMORY_TAGS
 233         setup_memory_tags (bd);
 234 #endif
 235 #ifdef CONFIG_CMDLINE_TAG
 236         setup_commandline_tag (bd, commandline);
 237 #endif
 238 #ifdef CONFIG_INITRD_TAG
 239         if (initrd_start && initrd_end)
 240                 setup_initrd_tag (bd, initrd_start, initrd_end);
 241 #endif
 242 #if defined (CONFIG_VFD)
 243         setup_videolfb_tag ((gd_t *) gd);
 244 #endif
 245         setup_end_tag (bd);
 246 #endif
 247
 248         /* we assume that the kernel is in place */
 249         printf ("\nStarting kernel ...\n\n");
 250
 251         cleanup_before_linux ();
 252
 253         theKernel (0, bd->bi_arch_number, bd->bi_boot_params);
 254 }
 255
 256
 257 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
 258     defined (CONFIG_CMDLINE_TAG) || \
 259     defined (CONFIG_INITRD_TAG) || \
 260     defined (CONFIG_SERIAL_TAG) || \
 261     defined (CONFIG_REVISION_TAG) || \
 262     defined (CONFIG_VFD)
 263 static void setup_start_tag (bd_t *bd)
 264 {
 265         params = (struct tag *) bd->bi_boot_params;
 266
 267         params->hdr.tag = ATAG_CORE;
 268         params->hdr.size = tag_size (tag_core);
 269
 270         params->u.core.flags = 0;
 271         params->u.core.pagesize = 0;
 272         params->u.core.rootdev = 0;
 273
 274         params = tag_next (params);
 275 }
 276
 277
 278 #ifdef CONFIG_SETUP_MEMORY_TAGS
 279 static void setup_memory_tags (bd_t *bd)
 280 {
 281         int i;
 282
 283         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 284                 params->hdr.tag = ATAG_MEM;
 285                 params->hdr.size = tag_size (tag_mem32);
 286
 287                 params->u.mem.start = bd->bi_dram[i].start;
 288                 params->u.mem.size = bd->bi_dram[i].size;
 289
 290                 params = tag_next (params);
 291         }
 292 }
 293 #endif /* CONFIG_SETUP_MEMORY_TAGS */
 294
 295
 296 static void setup_commandline_tag (bd_t *bd, char *commandline)
 297 {
 298         char *p;
 299
 300         /* eat leading white space */
 301         for (p = commandline; *p == ' '; p++);
 302
 303         /* skip non-existent command lines so the kernel will still
 304          * use its default command line.
 305          */
 306         if (*p == '\0')
 307                 return;
 308
 309         params->hdr.tag = ATAG_CMDLINE;
 310         params->hdr.size =
 311                 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
 312
 313         strcpy (params->u.cmdline.cmdline, p);
 314
 315         params = tag_next (params);
 316 }
 317
 318
 319 #ifdef CONFIG_INITRD_TAG
 320 static void setup_initrd_tag (bd_t *bd, ulong initrd_start, ulong initrd_end)
 321 {
 322         /* an ATAG_INITRD node tells the kernel where the compressed
 323          * ramdisk can be found. ATAG_RDIMG is a better name, actually.
 324          */
 325         params->hdr.tag = ATAG_INITRD2;
 326         params->hdr.size = tag_size (tag_initrd);
 327
 328         params->u.initrd.start = initrd_start;
 329         params->u.initrd.size = initrd_end - initrd_start;
 330
 331         params = tag_next (params);
 332 }
 333 #endif /* CONFIG_INITRD_TAG */
 334
 335
 336 #if defined (CONFIG_VFD)
 337 static void setup_videolfb_tag (gd_t *gd)
 338 {
 339         /* An ATAG_VIDEOLFB node tells the kernel where and how large
 340          * the framebuffer for video was allocated (among other things).
 341          * Note that a _physical_ address is passed !
 342          *
 343          * We only use it to pass the address and size, the other entries
 344          * in the tag_videolfb are not of interest.
 345          */
 346         params->hdr.tag = ATAG_VIDEOLFB;
 347         params->hdr.size = tag_size (tag_videolfb);
 348
 349         params->u.videolfb.lfb_base = (u32) gd->fb_base;
 350         /* 7168 = 256*4*56/8 - actually 2 pages (8192 bytes) are allocated */
 351         params->u.videolfb.lfb_size = 7168;
 352
 353         params = tag_next (params);
 354 }
 355 #endif
 356
 357 static void setup_end_tag (bd_t *bd)
 358 {
 359         params->hdr.tag = ATAG_NONE;
 360         params->hdr.size = 0;
 361 }
 362
 363 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */