Das U-Boot: Universal Boot Loader

diff --git a/common/env_common.c b/common/env_common.c
new file mode 100644 (file)
index 0000000..f7f268e
--- /dev/null
+++ b/common/env_common.c
@@ -0,0 +1,231 @@
+/*
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Andreas Heppel <aheppel@sysgo.de>
+
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.         See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <command.h>
+#include <environment.h>
+#include <cmd_nvedit.h>
+#include <linux/stddef.h>
+#include <malloc.h>
+
+#ifdef CONFIG_SHOW_BOOT_PROGRESS
+# include <status_led.h>
+# define SHOW_BOOT_PROGRESS(arg)       show_boot_progress(arg)
+#else
+# define SHOW_BOOT_PROGRESS(arg)
+#endif
+
+#undef DEBUG_ENV
+#ifdef DEBUG_ENV
+#define DEBUGF(fmt,args...) printf(fmt ,##args)
+#else
+#define DEBUGF(fmt,args...)
+#endif
+
+extern env_t *env_ptr;
+
+extern void env_relocate_spec (void);
+extern uchar env_get_char_spec(int);
+
+static uchar env_get_char_init (int index);
+uchar (*env_get_char)(int) = env_get_char_init;
+
+/************************************************************************
+ * Default settings to be used when no valid environment is found
+ */
+#define XMK_STR(x)     #x
+#define MK_STR(x)      XMK_STR(x)
+
+uchar default_environment[] = {
+#ifdef CONFIG_BOOTARGS
+       "bootargs="     CONFIG_BOOTARGS                 "\0"
+#endif
+#ifdef CONFIG_BOOTCOMMAND
+       "bootcmd="      CONFIG_BOOTCOMMAND              "\0"
+#endif
+#ifdef CONFIG_RAMBOOTCOMMAND
+       "ramboot="      CONFIG_RAMBOOTCOMMAND           "\0"
+#endif
+#ifdef CONFIG_NFSBOOTCOMMAND
+       "nfsboot="      CONFIG_NFSBOOTCOMMAND           "\0"
+#endif
+#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
+       "bootdelay="    MK_STR(CONFIG_BOOTDELAY)        "\0"
+#endif
+#if defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0)
+       "baudrate="     MK_STR(CONFIG_BAUDRATE)         "\0"
+#endif
+#ifdef CONFIG_LOADS_ECHO
+       "loads_echo="   MK_STR(CONFIG_LOADS_ECHO)       "\0"
+#endif
+#ifdef CONFIG_ETHADDR
+       "ethaddr="      MK_STR(CONFIG_ETHADDR)          "\0"
+#endif
+#ifdef CONFIG_ETH1ADDR
+       "eth1addr="     MK_STR(CONFIG_ETH1ADDR)         "\0"
+#endif
+#ifdef CONFIG_ETH2ADDR
+       "eth2addr="     MK_STR(CONFIG_ETH2ADDR)         "\0"
+#endif
+#ifdef CONFIG_IPADDR
+       "ipaddr="       MK_STR(CONFIG_IPADDR)           "\0"
+#endif
+#ifdef CONFIG_SERVERIP
+       "serverip="     MK_STR(CONFIG_SERVERIP)         "\0"
+#endif
+#ifdef CFG_AUTOLOAD
+       "autoload="     CFG_AUTOLOAD                    "\0"
+#endif
+#ifdef CONFIG_PREBOOT
+       "preboot="      CONFIG_PREBOOT                  "\0"
+#endif
+#ifdef CONFIG_ROOTPATH
+       "rootpath="     MK_STR(CONFIG_ROOTPATH)         "\0"
+#endif
+#ifdef CONFIG_GATEWAYIP
+       "gatewayip="    MK_STR(CONFIG_GATEWAYIP)        "\0"
+#endif
+#ifdef CONFIG_NETMASK
+       "netmask="      MK_STR(CONFIG_NETMASK)          "\0"
+#endif
+#ifdef CONFIG_HOSTNAME
+       "hostname="     MK_STR(CONFIG_HOSTNAME)         "\0"
+#endif
+#ifdef CONFIG_BOOTFILE
+       "bootfile="     MK_STR(CONFIG_BOOTFILE)         "\0"
+#endif
+#ifdef CONFIG_LOADADDR
+       "loadaddr="     MK_STR(CONFIG_LOADADDR)         "\0"
+#endif
+#ifdef  CONFIG_CLOCKS_IN_MHZ
+       "clocks_in_mhz=1\0"
+#endif
+#ifdef  CONFIG_EXTRA_ENV_SETTINGS
+       CONFIG_EXTRA_ENV_SETTINGS
+#endif
+       "\0"
+};
+
+
+void env_crc_update (void)
+{
+       env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
+}
+
+static uchar env_get_char_init (int index)
+{
+       DECLARE_GLOBAL_DATA_PTR;
+       uchar c;
+
+       /* if crc was bad, use the default environment */
+       if (gd->env_valid)
+       {
+               c = env_get_char_spec(index);
+       } else {
+               c = default_environment[index];
+       }
+
+       return (c);
+}
+
+uchar env_get_char_memory (int index)
+{
+       DECLARE_GLOBAL_DATA_PTR;
+
+       if (gd->env_valid) {
+               return ( *((uchar *)(gd->env_addr + index)) );
+       } else {
+               return ( default_environment[index] );
+       }
+}
+
+uchar *env_get_addr (int index)
+{
+       DECLARE_GLOBAL_DATA_PTR;
+
+       if (gd->env_valid) {
+               return ( ((uchar *)(gd->env_addr + index)) );
+       } else {
+               return (&default_environment[index]);
+       }
+}
+
+void env_relocate (void)
+{
+       DECLARE_GLOBAL_DATA_PTR;
+
+       DEBUGF ("%s[%d] offset = 0x%lx\n", __FUNCTION__,__LINE__,
+               gd->reloc_off);
+
+#ifdef ENV_IS_EMBEDDED
+       /*
+        * The environment buffer is embedded with the text segment,
+        * just relocate the environment pointer
+        */
+       env_ptr = (env_t *)((ulong)env_ptr + gd->reloc_off);
+       DEBUGF ("%s[%d] embedded ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
+#else
+       /*
+        * We must allocate a buffer for the environment
+        */
+       env_ptr = (env_t *)malloc (CFG_ENV_SIZE);
+       DEBUGF ("%s[%d] malloced ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
+#endif
+
+       /*
+        * After relocation to RAM, we can always use the "memory" functions
+        */
+       env_get_char = env_get_char_memory;
+
+       if (gd->env_valid == 0) {
+#if defined(CONFIG_GTH)        || defined(CFG_ENV_IS_NOWHERE)  /* Environment not changable */
+               puts ("Using default environment\n\n");
+#else
+               puts ("*** Warning - bad CRC, using default environment\n\n");
+               SHOW_BOOT_PROGRESS (-1);
+#endif
+
+               if (sizeof(default_environment) > ENV_SIZE)
+               {
+                       puts ("*** Error - default environment is too large\n\n");
+                       return;
+               }
+
+               memset (env_ptr, 0, sizeof(env_t));
+               memcpy (env_ptr->data,
+                       default_environment,
+                       sizeof(default_environment));
+#ifdef CFG_REDUNDAND_ENVIRONMENT
+               env_ptr->flags = 0xFF;
+#endif
+               env_crc_update ();
+               gd->env_valid = 1;
+       }
+       else {
+               env_relocate_spec ();
+       }
+       gd->env_addr = (ulong)&(env_ptr->data);
+}