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 #include <asm/setup.h>
  34 #define tag_size(type)  ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
  35 #define tag_next(t)     ((struct tag *)((u32 *)(t) + (t)->hdr.size))
  36
  37 /*cmd_boot.c*/
  38 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
  39
  40 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
  41     defined (CONFIG_CMDLINE_TAG) || \
  42     defined (CONFIG_INITRD_TAG) || \
  43     defined (CONFIG_VFD)
  44 static void setup_start_tag (bd_t *bd);
  45
  46 # ifdef CONFIG_SETUP_MEMORY_TAGS
  47 static void setup_memory_tags (bd_t *bd);
  48 # endif
  49 static void setup_commandline_tag (bd_t *bd, char *commandline);
  50
  51 #if 0
  52 static void setup_ramdisk_tag (bd_t *bd);
  53 #endif
  54 # ifdef CONFIG_INITRD_TAG
  55 static void setup_initrd_tag (bd_t *bd, ulong initrd_start,
  56                               ulong initrd_end);
  57 # endif
  58 static void setup_end_tag (bd_t *bd);
  59
  60 # if defined (CONFIG_VFD)
  61 static void setup_videolfb_tag (gd_t *gd);
  62 # endif
  63
  64
  65 static struct tag *params;
  66 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
  67
  68 #ifdef CONFIG_SHOW_BOOT_PROGRESS
  69 # include <status_led.h>
  70 # define SHOW_BOOT_PROGRESS(arg)        show_boot_progress(arg)
  71 #else
  72 # define SHOW_BOOT_PROGRESS(arg)
  73 #endif
  74
  75 extern image_header_t header;   /* from cmd_bootm.c */
  76
  77
  78 void do_bootm_linux (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
  79                      ulong addr, ulong *len_ptr, int verify)
  80 {
  81         DECLARE_GLOBAL_DATA_PTR;
  82
  83         ulong len = 0, checksum;
  84         ulong initrd_start, initrd_end;
  85         ulong data;
  86         void (*theKernel)(int zero, int arch, uint params);
  87         image_header_t *hdr = &header;
  88         bd_t *bd = gd->bd;
  89
  90 #ifdef CONFIG_CMDLINE_TAG
  91         char *commandline = getenv ("bootargs");
  92 #endif
  93
  94         theKernel = (void (*)(int, int, uint))ntohl(hdr->ih_ep);
  95
  96         /*
  97          * Check if there is an initrd image
  98          */
  99         if (argc >= 3) {
 100                 SHOW_BOOT_PROGRESS (9);
 101
 102                 addr = simple_strtoul (argv[2], NULL, 16);
 103
 104                 printf ("## Loading Ramdisk Image at %08lx ...\n", addr);
 105
 106                 /* Copy header so we can blank CRC field for re-calculation */
 107 #ifdef CONFIG_HAS_DATAFLASH
 108                 if (addr_dataflash (addr)) {
 109                         read_dataflash (addr, sizeof (image_header_t),
 110                                         (char *) &header);
 111                 } else
 112 #endif
 113                         memcpy (&header, (char *) addr,
 114                                 sizeof (image_header_t));
 115
 116                 if (ntohl (hdr->ih_magic) != IH_MAGIC) {
 117                         printf ("Bad Magic Number\n");
 118                         SHOW_BOOT_PROGRESS (-10);
 119                         do_reset (cmdtp, flag, argc, argv);
 120                 }
 121
 122                 data = (ulong) & header;
 123                 len = sizeof (image_header_t);
 124
 125                 checksum = ntohl (hdr->ih_hcrc);
 126                 hdr->ih_hcrc = 0;
 127
 128                 if (crc32 (0, (char *) data, len) != checksum) {
 129                         printf ("Bad Header Checksum\n");
 130                         SHOW_BOOT_PROGRESS (-11);
 131                         do_reset (cmdtp, flag, argc, argv);
 132                 }
 133
 134                 SHOW_BOOT_PROGRESS (10);
 135
 136                 print_image_hdr (hdr);
 137
 138                 data = addr + sizeof (image_header_t);
 139                 len = ntohl (hdr->ih_size);
 140
 141 #ifdef CONFIG_HAS_DATAFLASH
 142                 if (addr_dataflash (addr)) {
 143                         read_dataflash (data, len, (char *) CFG_LOAD_ADDR);
 144                         data = CFG_LOAD_ADDR;
 145                 }
 146 #endif
 147
 148                 if (verify) {
 149                         ulong csum = 0;
 150
 151                         printf ("   Verifying Checksum ... ");
 152                         csum = crc32 (0, (char *) data, len);
 153                         if (csum != ntohl (hdr->ih_dcrc)) {
 154                                 printf ("Bad Data CRC\n");
 155                                 SHOW_BOOT_PROGRESS (-12);
 156                                 do_reset (cmdtp, flag, argc, argv);
 157                         }
 158                         printf ("OK\n");
 159                 }
 160
 161                 SHOW_BOOT_PROGRESS (11);
 162
 163                 if ((hdr->ih_os != IH_OS_LINUX) ||
 164                     (hdr->ih_arch != IH_CPU_ARM) ||
 165                     (hdr->ih_type != IH_TYPE_RAMDISK)) {
 166                         printf ("No Linux ARM Ramdisk Image\n");
 167                         SHOW_BOOT_PROGRESS (-13);
 168                         do_reset (cmdtp, flag, argc, argv);
 169                 }
 170
 171                 /*
 172                  * Now check if we have a multifile image
 173                  */
 174         } else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
 175                 ulong tail = ntohl (len_ptr[0]) % 4;
 176                 int i;
 177
 178                 SHOW_BOOT_PROGRESS (13);
 179
 180                 /* skip kernel length and terminator */
 181                 data = (ulong) (&len_ptr[2]);
 182                 /* skip any additional image length fields */
 183                 for (i = 1; len_ptr[i]; ++i)
 184                         data += 4;
 185                 /* add kernel length, and align */
 186                 data += ntohl (len_ptr[0]);
 187                 if (tail) {
 188                         data += 4 - tail;
 189                 }
 190
 191                 len = ntohl (len_ptr[1]);
 192
 193         } else {
 194                 /*
 195                  * no initrd image
 196                  */
 197                 SHOW_BOOT_PROGRESS (14);
 198
 199                 len = data = 0;
 200         }
 201
 202 #ifdef  DEBUG
 203         if (!data) {
 204                 printf ("No initrd\n");
 205         }
 206 #endif
 207
 208         if (data) {
 209                 initrd_start = data;
 210                 initrd_end = initrd_start + len;
 211         } else {
 212                 initrd_start = 0;
 213                 initrd_end = 0;
 214         }
 215
 216         SHOW_BOOT_PROGRESS (15);
 217
 218         debug ("## Transferring control to Linux (at address %08lx) ...\n",
 219                (ulong) theKernel);
 220
 221 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
 222     defined (CONFIG_CMDLINE_TAG) || \
 223     defined (CONFIG_INITRD_TAG) || \
 224     defined (CONFIG_VFD)
 225         setup_start_tag (bd);
 226 #ifdef CONFIG_SETUP_MEMORY_TAGS
 227         setup_memory_tags (bd);
 228 #endif
 229 #ifdef CONFIG_CMDLINE_TAG
 230         setup_commandline_tag (bd, commandline);
 231 #endif
 232 #ifdef CONFIG_INITRD_TAG
 233         if (initrd_start && initrd_end)
 234                 setup_initrd_tag (bd, initrd_start, initrd_end);
 235 #endif
 236 #if defined (CONFIG_VFD)
 237         setup_videolfb_tag ((gd_t *) gd);
 238 #endif
 239         setup_end_tag (bd);
 240 #endif
 241
 242         /* we assume that the kernel is in place */
 243         printf ("\nStarting kernel ...\n\n");
 244
 245         cleanup_before_linux ();
 246
 247         theKernel (0, bd->bi_arch_number, bd->bi_boot_params);
 248 }
 249
 250
 251 #if defined (CONFIG_SETUP_MEMORY_TAGS) || \
 252     defined (CONFIG_CMDLINE_TAG) || \
 253     defined (CONFIG_INITRD_TAG) || \
 254     defined (CONFIG_VFD)
 255 static void setup_start_tag (bd_t *bd)
 256 {
 257         params = (struct tag *) bd->bi_boot_params;
 258
 259         params->hdr.tag = ATAG_CORE;
 260         params->hdr.size = tag_size (tag_core);
 261
 262         params->u.core.flags = 0;
 263         params->u.core.pagesize = 0;
 264         params->u.core.rootdev = 0;
 265
 266         params = tag_next (params);
 267 }
 268
 269
 270 #ifdef CONFIG_SETUP_MEMORY_TAGS
 271 static void setup_memory_tags (bd_t *bd)
 272 {
 273         int i;
 274
 275         for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
 276                 params->hdr.tag = ATAG_MEM;
 277                 params->hdr.size = tag_size (tag_mem32);
 278
 279                 params->u.mem.start = bd->bi_dram[i].start;
 280                 params->u.mem.size = bd->bi_dram[i].size;
 281
 282                 params = tag_next (params);
 283         }
 284 }
 285 #endif /* CONFIG_SETUP_MEMORY_TAGS */
 286
 287
 288 static void setup_commandline_tag (bd_t *bd, char *commandline)
 289 {
 290         char *p;
 291
 292         /* eat leading white space */
 293         for (p = commandline; *p == ' '; p++);
 294
 295         /* skip non-existent command lines so the kernel will still
 296          * use its default command line.
 297          */
 298         if (*p == '\0')
 299                 return;
 300
 301         params->hdr.tag = ATAG_CMDLINE;
 302         params->hdr.size =
 303                 (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
 304
 305         strcpy (params->u.cmdline.cmdline, p);
 306
 307         params = tag_next (params);
 308 }
 309
 310
 311 #ifndef ATAG_INITRD2
 312 #define ATAG_INITRD2    0x54420005
 313 #endif
 314
 315 #ifdef CONFIG_INITRD_TAG
 316 static void setup_initrd_tag (bd_t *bd, ulong initrd_start, ulong initrd_end)
 317 {
 318         /* an ATAG_INITRD node tells the kernel where the compressed
 319          * ramdisk can be found. ATAG_RDIMG is a better name, actually.
 320          */
 321         params->hdr.tag = ATAG_INITRD2;
 322         params->hdr.size = tag_size (tag_initrd);
 323
 324         params->u.initrd.start = initrd_start;
 325         params->u.initrd.size = initrd_end - initrd_start;
 326
 327         params = tag_next (params);
 328 }
 329 #endif /* CONFIG_INITRD_TAG */
 330
 331
 332 #if defined (CONFIG_VFD)
 333 static void setup_videolfb_tag (gd_t *gd)
 334 {
 335         /* An ATAG_VIDEOLFB node tells the kernel where and how large
 336          * the framebuffer for video was allocated (among other things).
 337          * Note that a _physical_ address is passed !
 338          *
 339          * We only use it to pass the address and size, the other entries
 340          * in the tag_videolfb are not of interest.
 341          */
 342         params->hdr.tag = ATAG_VIDEOLFB;
 343         params->hdr.size = tag_size (tag_videolfb);
 344
 345         params->u.videolfb.lfb_base = (u32) gd->fb_base;
 346         /* 7168 = 256*4*56/8 - actually 2 pages (8192 bytes) are allocated */
 347         params->u.videolfb.lfb_size = 7168;
 348
 349         params = tag_next (params);
 350 }
 351 #endif
 352
 353 static void setup_end_tag (bd_t *bd)
 354 {
 355         params->hdr.tag = ATAG_NONE;
 356         params->hdr.size = 0;
 357 }
 358
 359 #endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */