3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
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.
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.
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,
31 #include <environment.h>
33 #if ( ((CFG_ENV_ADDR+CFG_ENV_SIZE) < CFG_MONITOR_BASE) || \
34 (CFG_ENV_ADDR >= (CFG_MONITOR_BASE + CFG_MONITOR_LEN)) ) || \
35 defined(CFG_ENV_IS_IN_NVRAM)
36 #define TOTAL_MALLOC_LEN (CFG_MALLOC_LEN + CFG_ENV_SIZE)
38 #define TOTAL_MALLOC_LEN CFG_MALLOC_LEN
43 extern int timer_init(void);
45 const char version_string[] =
46 U_BOOT_VERSION" (" __DATE__ " - " __TIME__ ")";
48 static char *failed = "*** failed ***\n";
51 * Begin and End of memory area for malloc(), and current "brk"
53 static ulong mem_malloc_start;
54 static ulong mem_malloc_end;
55 static ulong mem_malloc_brk;
59 * The Malloc area is immediately below the monitor copy in DRAM
61 static void mem_malloc_init (void)
63 DECLARE_GLOBAL_DATA_PTR;
65 ulong dest_addr = CFG_MONITOR_BASE + gd->reloc_off;
67 mem_malloc_end = dest_addr;
68 mem_malloc_start = dest_addr - TOTAL_MALLOC_LEN;
69 mem_malloc_brk = mem_malloc_start;
71 memset ((void *) mem_malloc_start,
73 mem_malloc_end - mem_malloc_start);
76 void *sbrk (ptrdiff_t increment)
78 ulong old = mem_malloc_brk;
79 ulong new = old + increment;
81 if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
85 return ((void *) old);
89 static int init_func_ram (void)
91 DECLARE_GLOBAL_DATA_PTR;
93 #ifdef CONFIG_BOARD_TYPES
94 int board_type = gd->board_type;
96 int board_type = 0; /* use dummy arg */
100 if ((gd->ram_size = initdram (board_type)) > 0) {
101 print_size (gd->ram_size, "\n");
108 static int display_banner(void)
111 printf ("\n\n%s\n\n", version_string);
115 static void display_flash_config(ulong size)
118 print_size (size, "\n");
122 static int init_baudrate (void)
124 DECLARE_GLOBAL_DATA_PTR;
126 uchar tmp[64]; /* long enough for environment variables */
127 int i = getenv_r ("baudrate", tmp, sizeof (tmp));
129 gd->baudrate = (i > 0)
130 ? (int) simple_strtoul (tmp, NULL, 10)
138 * Breath some life into the board...
140 * The first part of initialization is running from Flash memory;
141 * its main purpose is to initialize the RAM so that we
142 * can relocate the monitor code to RAM.
146 * All attempts to come up with a "common" initialization sequence
147 * that works for all boards and architectures failed: some of the
148 * requirements are just _too_ different. To get rid of the resulting
149 * mess of board dependend #ifdef'ed code we now make the whole
150 * initialization sequence configurable to the user.
152 * The requirements for any new initalization function is simple: it
153 * receives a pointer to the "global data" structure as it's only
154 * argument, and returns an integer return code, where 0 means
155 * "continue" and != 0 means "fatal error, hang the system".
157 typedef int (init_fnc_t) (void);
159 init_fnc_t *init_sequence[] = {
161 env_init, /* initialize environment */
162 init_baudrate, /* initialze baudrate settings */
163 serial_init, /* serial communications setup */
165 display_banner, /* say that we are here */
172 void board_init_f(ulong bootflag)
174 DECLARE_GLOBAL_DATA_PTR;
178 init_fnc_t **init_fnc_ptr;
179 ulong addr, addr_sp, len = CFG_MONITOR_LEN;
181 /* Pointer is writable since we allocated a register for it.
184 memset (gd, 0, sizeof (gd_t));
186 for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
187 if ((*init_fnc_ptr)() != 0) {
193 * Now that we have DRAM mapped and working, we can
194 * relocate the code and continue running from DRAM.
196 addr = CFG_SDRAM_BASE + gd->ram_size;
198 /* We can reserve some RAM "on top" here.
201 /* round down to next 4 kB limit.
205 printf ("Top of RAM usable for U-Boot at: %08lx\n", addr);
208 /* Reserve memory for U-Boot code, data & bss
209 * round down to next 4 kB limit
215 printf ("Reserving %ldk for U-Boot at: %08lx\n", len >> 10, addr);
218 /* Reserve memory for malloc() arena.
220 addr_sp = addr - TOTAL_MALLOC_LEN;
222 printf ("Reserving %dk for malloc() at: %08lx\n",
223 TOTAL_MALLOC_LEN >> 10, addr_sp);
227 * (permanently) allocate a Board Info struct
228 * and a permanent copy of the "global" data
230 addr_sp -= sizeof(bd_t);
231 bd = (bd_t *)addr_sp;
234 printf ("Reserving %d Bytes for Board Info at: %08lx\n",
235 sizeof(bd_t), addr_sp);
237 addr_sp -= sizeof(gd_t);
238 id = (gd_t *)addr_sp;
240 printf ("Reserving %d Bytes for Global Data at: %08lx\n",
241 sizeof (gd_t), addr_sp);
244 /* Reserve memory for boot params.
246 addr_sp -= CFG_BOOTPARAMS_LEN;
247 bd->bi_boot_params = addr_sp;
249 printf ("Reserving %dk for malloc() at: %08lx\n",
250 CFG_BOOTPARAMS_LEN >> 10, addr_sp);
254 * Finally, we set up a new (bigger) stack.
256 * Leave some safety gap for SP, force alignment on 16 byte boundary
257 * Clear initial stack frame
261 *((ulong *) addr_sp)-- = 0;
262 *((ulong *) addr_sp)-- = 0;
264 printf ("Stack Pointer at: %08lx\n", addr_sp);
267 * Save local variables to board info struct
269 bd->bi_memstart = CFG_SDRAM_BASE; /* start of DRAM memory */
270 bd->bi_memsize = gd->ram_size; /* size of DRAM memory in bytes */
271 bd->bi_baudrate = gd->baudrate; /* Console Baudrate */
273 memcpy (id, gd, sizeof (gd_t));
274 relocate_code (addr_sp, id, addr);
276 /* NOTREACHED - relocate_code() does not return */
278 /************************************************************************
280 * This is the next part if the initialization sequence: we are now
281 * running from RAM and have a "normal" C environment, i. e. global
282 * data can be written, BSS has been cleared, the stack size in not
283 * that critical any more, etc.
285 ************************************************************************
288 void board_init_r (gd_t *id, ulong dest_addr)
290 DECLARE_GLOBAL_DATA_PTR;
294 extern void malloc_bin_reloc (void);
295 #ifndef CFG_ENV_IS_NOWHERE
296 extern char * env_name_spec;
303 gd->flags |= GD_FLG_RELOC; /* tell others: relocation done */
306 printf ("Now running in RAM - U-Boot at: %08lx\n", dest_addr);
309 gd->reloc_off = dest_addr - CFG_MONITOR_BASE;
312 * We have to relocate the command table manually
314 for (cmdtp = &cmd_tbl[0]; cmdtp->name; cmdtp++) {
317 addr = (ulong) (cmdtp->cmd) + gd->reloc_off;
319 printf ("Command \"%s\": 0x%08lx => 0x%08lx\n",
320 cmdtp->name, (ulong) (cmdtp->cmd), addr);
323 (int (*)(struct cmd_tbl_s *, int, int, char *[]))addr;
325 addr = (ulong)(cmdtp->name) + gd->reloc_off;
326 cmdtp->name = (char *)addr;
329 addr = (ulong)(cmdtp->usage) + gd->reloc_off;
330 cmdtp->usage = (char *)addr;
334 addr = (ulong)(cmdtp->help) + gd->reloc_off;
335 cmdtp->help = (char *)addr;
339 /* there are some other pointer constants we must deal with */
340 #ifndef CFG_ENV_IS_NOWHERE
341 env_name_spec += gd->reloc_off;
344 /* configure available FLASH banks */
346 display_flash_config (size);
349 bd->bi_flashstart = CFG_FLASH_BASE;
350 bd->bi_flashsize = size;
351 #if CFG_MONITOR_BASE == CFG_FLASH_BASE
352 bd->bi_flashoffset = CFG_MONITOR_LEN; /* reserved area for U-Boot */
354 bd->bi_flashoffset = 0;
357 /* initialize malloc() area */
361 /* relocate environment function pointers etc. */
364 /* board MAC address */
365 s = getenv ("ethaddr");
366 for (i = 0; i < 6; ++i) {
367 bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
369 s = (*e) ? e + 1 : e;
373 bd->bi_ip_addr = getenv_IPaddr("ipaddr");
375 /** leave this here (after malloc(), environment and PCI are working) **/
376 /* Initialize devices */
379 /* allocate syscalls table (console_init_r will fill it in */
380 syscall_tbl = (void **) malloc (NR_SYSCALLS * sizeof (void *));
382 /* Initialize the console (after the relocation and devices init) */
384 /** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** **/
386 #if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(CONFIG_NET_MULTI)
388 eth_initialize(gd->bd);
391 /* main_loop() can return to retry autoboot, if so just run it again. */
396 /* NOTREACHED - no way out of command loop except booting */
401 puts ("### ERROR ### Please RESET the board ###\n");