lib_blackfin/bootm.c

   1 /*
   2  * U-boot - bootm.c - misc boot helper functions
   3  *
   4  * Copyright (c) 2005-2008 Analog Devices Inc.
   5  *
   6  * (C) Copyright 2000-2004
   7  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   8  *
   9  * Licensed under the GPL-2 or later.
  10  */
  11
  12 #include <common.h>
  13 #include <command.h>
  14 #include <image.h>
  15 #include <asm/blackfin.h>
  16
  17 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
  18
  19 #ifdef SHARED_RESOURCES
  20 extern void swap_to(int device_id);
  21 #endif
  22
  23 static char *make_command_line(void)
  24 {
  25         char *dest = (char *)CMD_LINE_ADDR;
  26         char *bootargs = getenv("bootargs");
  27
  28         if (bootargs == NULL)
  29                 return NULL;
  30
  31         strncpy(dest, bootargs, 0x1000);
  32         dest[0xfff] = 0;
  33         return dest;
  34 }
  35
  36 void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
  37                     bootm_headers_t *images)
  38 {
  39         int     (*appl) (char *cmdline);
  40         char    *cmdline;
  41         ulong   ep = 0;
  42
  43         if (!images->autostart)
  44                 return;
  45
  46 #ifdef SHARED_RESOURCES
  47         swap_to(FLASH);
  48 #endif
  49
  50         /* find kernel entry point */
  51         if (images->legacy_hdr_valid) {
  52                 ep = image_get_ep (images->legacy_hdr_os);
  53 #if defined(CONFIG_FIT)
  54         } else if (images->fit_uname_os) {
  55                 int ret = fit_image_get_entry (images->fit_hdr_os,
  56                                 images->fit_noffset_os, &ep);
  57                 if (ret) {
  58                         puts ("Can't get entry point property!\n");
  59                         goto error;
  60                 }
  61 #endif
  62         } else {
  63                 puts ("Could not find kernel entry point!\n");
  64                 goto error;
  65         }
  66         appl = (int (*)(char *))ep;
  67
  68         printf("Starting Kernel at = %x\n", appl);
  69         cmdline = make_command_line();
  70         icache_disable();
  71         dcache_disable();
  72         (*appl) (cmdline);
  73         /* does not return */
  74         return;
  75
  76  error:
  77         if (images->autostart)
  78                 do_reset (cmdtp, flag, argc, argv);
  79 }