src/phase2.c

   1 /*
   2  * (C) Copyright 2008 Openmoko, Inc.
   3  * Author: Andy Green <andy@openmoko.org>
   4  *
   5  * Parse the U-Boot header and Boot Linux
   6  * based on various code from U-Boot
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (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,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <qi.h>
  25 #include <neo_gta02.h>
  26 #include "blink_led.h"
  27 #include <string.h>
  28 #define __ARM__
  29 #include <image.h>
  30 #include <setup.h>
  31 #include "nand_read.h"
  32 #include <ext2.h>
  33
  34 unsigned long partition_offset_blocks = 0;
  35 unsigned long partition_length_blocks = 0;
  36
  37 struct kernel_source const * this_kernel = 0;
  38
  39
  40 void bootloader_second_phase(void)
  41 {
  42         void    (*the_kernel)(int zero, int arch, uint params);
  43         int kernel = 0;
  44         const struct board_variant * board_variant =
  45                                               (this_board->get_board_variant)();
  46
  47         /* we try the possible kernels for this board in order */
  48
  49         this_kernel = &this_board->kernel_source[kernel++];
  50
  51         while (this_kernel->name) {
  52                 const char *p;
  53                 struct tag *params = (struct tag *)this_board->linux_tag_placement;
  54                 void * kernel_dram = (void *)(TEXT_BASE - (8 * 1024 * 1024));
  55                 unsigned long crc;
  56                 image_header_t  *hdr;
  57                 u32 kernel_size;
  58
  59                 partition_offset_blocks = 0;
  60                 partition_length_blocks = 0;
  61
  62                 /* eat leading white space */
  63                 for (p = this_kernel->commandline; *p == ' '; p++);
  64
  65                 puts("\n\nTrying kernel: ");
  66                 puts(this_kernel->name);
  67                 puts("\n");
  68
  69                 /* if this device needs initializing, try to init it */
  70                 if (this_kernel->block_init)
  71                         if ((this_kernel->block_init)()) {
  72                                 puts("block device init failed\n");
  73                                 this_kernel = &this_board->
  74                                                         kernel_source[kernel++];
  75                                 continue;
  76                         }
  77
  78                 /* if there's a partition table implied, parse it, otherwise
  79                  * just use a fixed offset
  80                  */
  81                 if (this_kernel->partition_index) {
  82                         unsigned char *p = kernel_dram;
  83
  84                         if (this_kernel->block_read(kernel_dram, 0, 4) < 0) {
  85                                 puts("Bad partition read\n");
  86                                 this_kernel = &this_board->
  87                                                         kernel_source[kernel++];
  88                                 continue;
  89                         }
  90
  91                         if ((p[0x1fe] != 0x55) || (p[0x1ff] != 0xaa)) {
  92                                 puts("partition signature missing\n");
  93                                 this_kernel = &this_board->
  94                                                         kernel_source[kernel++];
  95                                 continue;
  96                         }
  97
  98                         p += 0x1be + 8 + (0x10 *
  99                                             (this_kernel->partition_index - 1));
 100
 101                         partition_offset_blocks = (((u32)p[3]) << 24) |
 102                                                   (((u32)p[2]) << 16) |
 103                                                   (((u32)p[1]) << 8) |
 104                                                   p[0];
 105                         partition_length_blocks = (((u32)p[7]) << 24) |
 106                                                   (((u32)p[6]) << 16) |
 107                                                   (((u32)p[5]) << 8) |
 108                                                   p[4];
 109
 110                         puts("    Partition: ");
 111                         printdec(this_kernel->partition_index);
 112                         puts(" start +");
 113                         printdec(partition_offset_blocks);
 114                         puts(" 512-byte blocks, size ");
 115                         printdec(partition_length_blocks / 2048);
 116                         puts(" MiB\n");
 117
 118                 } else
 119                         partition_offset_blocks =
 120                                   this_kernel->offset_blocks512_if_no_partition;
 121
 122                 switch (this_kernel->filesystem) {
 123                 case FS_EXT2:
 124                         if (!ext2fs_mount()) {
 125                                 puts("Unable to mount ext2 filesystem\n");
 126                                 this_kernel = &this_board->
 127                                                         kernel_source[kernel++];
 128                                 continue;
 129                         }
 130                         puts("    EXT2 open: ");
 131                         puts(this_kernel->filepath);
 132                         puts("\n");
 133                         if (ext2fs_open(this_kernel->filepath) < 0) {
 134                                 puts("Open failed\n");
 135                                 this_kernel = &this_board->
 136                                                         kernel_source[kernel++];
 137                                 continue;
 138                         }
 139                         ext2fs_read(kernel_dram, 4096);
 140                         break;
 141                 case FS_FAT:
 142                         /* FIXME */
 143                 case FS_RAW:
 144                         puts("     RAW open: +");
 145                         printdec(partition_offset_blocks);
 146                         puts(" 512-byte blocks\n");
 147                         if (this_kernel->block_read(kernel_dram,
 148                                               partition_offset_blocks, 8) < 0) {
 149                                 puts ("Bad kernel header\n");
 150                                 this_kernel = &this_board->
 151                                                         kernel_source[kernel++];
 152                                 continue;
 153                         }
 154                         break;
 155                 }
 156
 157                 hdr = (image_header_t *)kernel_dram;
 158
 159                 if (__be32_to_cpu(hdr->ih_magic) != IH_MAGIC) {
 160                         puts("bad magic ");
 161                         print32(hdr->ih_magic);
 162                         puts("\n");
 163                         this_kernel = &this_board->kernel_source[kernel++];
 164                         continue;
 165                 }
 166
 167                 puts("        Found: \"");
 168                 puts((const char *)hdr->ih_name);
 169                 puts("\"\n         Size: ");
 170                 printdec(__be32_to_cpu(hdr->ih_size) >> 10);
 171                 puts(" KiB\n");
 172
 173                 kernel_size = ((__be32_to_cpu(hdr->ih_size) +
 174                                   sizeof(image_header_t) + 2048) & ~(2048 - 1));
 175
 176                 switch (this_kernel->filesystem) {
 177                 case FS_EXT2:
 178                         /* This read API always restarts from beginning */
 179                         ext2fs_read(kernel_dram, kernel_size);
 180                         break;
 181                 case FS_FAT:
 182                         /* FIXME */
 183                 case FS_RAW:
 184                         if ((this_kernel->block_read)(
 185                                 kernel_dram, partition_offset_blocks,
 186                                                 kernel_size >> 9) < 0) {
 187                                 puts ("Bad kernel read\n");
 188                                 this_kernel = &this_board->
 189                                                         kernel_source[kernel++];
 190                                 continue;
 191                         }
 192                         break;
 193                 }
 194
 195                 puts("      Cmdline: ");
 196                 puts(p);
 197                 puts("\n");
 198
 199                 /*
 200                  * It's good for now to know that our kernel is intact from
 201                  * the storage before we jump into it and maybe crash silently
 202                  * even though it costs us some time
 203                  */
 204                 crc = crc32(0, kernel_dram + sizeof(image_header_t),
 205                                                    __be32_to_cpu(hdr->ih_size));
 206                 if (crc != __be32_to_cpu(hdr->ih_dcrc)) {
 207                         puts("\nKernel CRC ERROR: read 0x");
 208                         print32(crc);
 209                         puts(" vs hdr CRC 0x");
 210                         print32(__be32_to_cpu(hdr->ih_dcrc));
 211                         puts("\n");
 212                         this_kernel = &this_board->kernel_source[kernel++];
 213                         continue;
 214                 }
 215
 216                 the_kernel = (void (*)(int, int, uint))
 217                                         (((char *)hdr) + sizeof(image_header_t));
 218
 219                 /* first tag */
 220                 params->hdr.tag = ATAG_CORE;
 221                 params->hdr.size = tag_size (tag_core);
 222                 params->u.core.flags = 0;
 223                 params->u.core.pagesize = 0;
 224                 params->u.core.rootdev = 0;
 225                 params = tag_next(params);
 226
 227                 /* revision tag */
 228                 params->hdr.tag = ATAG_REVISION;
 229                 params->hdr.size = tag_size (tag_revision);
 230                 params->u.revision.rev = board_variant->machine_revision;
 231                 params = tag_next(params);
 232
 233                 /* memory tags */
 234                 params->hdr.tag = ATAG_MEM;
 235                 params->hdr.size = tag_size (tag_mem32);
 236                 params->u.mem.start = this_board->linux_mem_start;
 237                 params->u.mem.size = this_board->linux_mem_size;
 238                 params = tag_next(params);
 239
 240                 /* kernel commandline */
 241
 242                 if (*p) {
 243                         params->hdr.tag = ATAG_CMDLINE;
 244                         params->hdr.size = (sizeof (struct tag_header) +
 245                                                        strlen (p) + 1 + 4) >> 2;
 246                         strcpy (params->u.cmdline.cmdline, p);
 247                         params = tag_next (params);
 248                 }
 249
 250                 /* needs to always be the last tag */
 251                 params->hdr.tag = ATAG_NONE;
 252                 params->hdr.size = 0;
 253
 254                 puts ("Starting --->\n\n");
 255
 256                 /*
 257                 * ooh that's it, we're gonna try boot this image!
 258                 * never mind the cache, Linux will take care of it
 259                 */
 260                 the_kernel(0, this_board->linux_machine_id,
 261                                                 this_board->linux_tag_placement);
 262
 263                 /* we won't come back here no matter what */
 264         }
 265
 266         /* none of the kernels worked out */
 267
 268         puts("No usable kernel image found, we've had it  :-(\n");
 269         while (1)
 270                 blue_on(1);
 271 }