lib_blackfin/bootm.c

   1 /*
   2  * U-boot - bf533_linux.c
   3  *
   4  * Copyright (c) 2005-2007 Analog Devices Inc.
   5  *
   6  * (C) Copyright 2000-2004
   7  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   8  *
   9  * See file CREDITS for list of people who contributed to this
  10  * project.
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License as
  14  * published by the Free Software Foundation; either version 2 of
  15  * the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  25  * MA 02110-1301 USA
  26  */
  27
  28 /* Dummy functions, currently not in Use */
  29
  30 #include <common.h>
  31 #include <command.h>
  32 #include <image.h>
  33 #include <zlib.h>
  34 #include <asm/byteorder.h>
  35
  36 #define LINUX_MAX_ENVS          256
  37 #define LINUX_MAX_ARGS          256
  38
  39 #define CMD_LINE_ADDR 0xFF900000        /* L1 scratchpad */
  40
  41 #ifdef SHARED_RESOURCES
  42 extern void swap_to(int device_id);
  43 #endif
  44
  45 extern void flush_instruction_cache(void);
  46 extern void flush_data_cache(void);
  47 static char *make_command_line(void);
  48
  49 void do_bootm_linux(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[],
  50                     bootm_headers_t *images)
  51 {
  52         int     (*appl) (char *cmdline);
  53         char    *cmdline;
  54         ulong   ep = 0;
  55
  56         if (!images->autostart)
  57                 return ;
  58
  59 #ifdef SHARED_RESOURCES
  60         swap_to(FLASH);
  61 #endif
  62
  63         /* find kernel entry point */
  64         if (images->legacy_hdr_valid) {
  65                 ep = image_get_ep (images->legacy_hdr_os);
  66 #if defined(CONFIG_FIT)
  67         } else if (images->fit_uname_os) {
  68                 int ret = fit_image_get_entry (images->fit_hdr_os,
  69                                 images->fit_noffset_os, &ep);
  70                 if (ret) {
  71                         puts ("Can't get entry point property!\n");
  72                         goto error;
  73                 }
  74 #endif
  75         } else {
  76                 puts ("Could not find kernel entry point!\n");
  77                 goto error;
  78         }
  79         appl = (int (*)(char *))ep;
  80
  81         printf("Starting Kernel at = %x\n", appl);
  82         cmdline = make_command_line();
  83         if (icache_status()) {
  84                 flush_instruction_cache();
  85                 icache_disable();
  86         }
  87         if (dcache_status()) {
  88                 flush_data_cache();
  89                 dcache_disable();
  90         }
  91         (*appl) (cmdline);
  92         /* does not return */
  93         return;
  94
  95 error:
  96         if (images->autostart)
  97                 do_reset (cmdtp, flag, argc, argv);
  98         return;
  99 }
 100
 101 char *make_command_line(void)
 102 {
 103         char *dest = (char *)CMD_LINE_ADDR;
 104         char *bootargs;
 105
 106         if ((bootargs = getenv("bootargs")) == NULL)
 107                 return NULL;
 108
 109         strncpy(dest, bootargs, 0x1000);
 110         dest[0xfff] = 0;
 111         return dest;
 112 }