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,
30 #include <environment.h>
32 #if ( ((CFG_ENV_ADDR+CFG_ENV_SIZE) < CFG_MONITOR_BASE) || \
33 (CFG_ENV_ADDR >= (CFG_MONITOR_BASE + CFG_MONITOR_LEN)) ) || \
34 defined(CFG_ENV_IS_IN_NVRAM)
35 #define TOTAL_MALLOC_LEN (CFG_MALLOC_LEN + CFG_ENV_SIZE)
37 #define TOTAL_MALLOC_LEN CFG_MALLOC_LEN
42 extern int timer_init(void);
44 extern ulong uboot_end_data;
45 extern ulong uboot_end;
47 ulong monitor_flash_len;
49 const char version_string[] =
50 U_BOOT_VERSION" (" __DATE__ " - " __TIME__ ")";
52 static char *failed = "*** failed ***\n";
55 * Begin and End of memory area for malloc(), and current "brk"
57 static ulong mem_malloc_start;
58 static ulong mem_malloc_end;
59 static ulong mem_malloc_brk;
63 * The Malloc area is immediately below the monitor copy in DRAM
65 static void mem_malloc_init (void)
67 DECLARE_GLOBAL_DATA_PTR;
69 ulong dest_addr = CFG_MONITOR_BASE + gd->reloc_off;
71 mem_malloc_end = dest_addr;
72 mem_malloc_start = dest_addr - TOTAL_MALLOC_LEN;
73 mem_malloc_brk = mem_malloc_start;
75 memset ((void *) mem_malloc_start,
77 mem_malloc_end - mem_malloc_start);
80 void *sbrk (ptrdiff_t increment)
82 ulong old = mem_malloc_brk;
83 ulong new = old + increment;
85 if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
89 return ((void *) old);
93 static int init_func_ram (void)
95 DECLARE_GLOBAL_DATA_PTR;
97 #ifdef CONFIG_BOARD_TYPES
98 int board_type = gd->board_type;
100 int board_type = 0; /* use dummy arg */
104 if ((gd->ram_size = initdram (board_type)) > 0) {
105 print_size (gd->ram_size, "\n");
112 static int display_banner(void)
115 printf ("\n\n%s\n\n", version_string);
119 static void display_flash_config(ulong size)
122 print_size (size, "\n");
126 static int init_baudrate (void)
128 DECLARE_GLOBAL_DATA_PTR;
130 uchar tmp[64]; /* long enough for environment variables */
131 int i = getenv_r ("baudrate", tmp, sizeof (tmp));
133 gd->baudrate = (i > 0)
134 ? (int) simple_strtoul (tmp, NULL, 10)
142 * Breath some life into the board...
144 * The first part of initialization is running from Flash memory;
145 * its main purpose is to initialize the RAM so that we
146 * can relocate the monitor code to RAM.
150 * All attempts to come up with a "common" initialization sequence
151 * that works for all boards and architectures failed: some of the
152 * requirements are just _too_ different. To get rid of the resulting
153 * mess of board dependend #ifdef'ed code we now make the whole
154 * initialization sequence configurable to the user.
156 * The requirements for any new initalization function is simple: it
157 * receives a pointer to the "global data" structure as it's only
158 * argument, and returns an integer return code, where 0 means
159 * "continue" and != 0 means "fatal error, hang the system".
161 typedef int (init_fnc_t) (void);
163 init_fnc_t *init_sequence[] = {
165 env_init, /* initialize environment */
166 init_baudrate, /* initialze baudrate settings */
167 serial_init, /* serial communications setup */
169 display_banner, /* say that we are here */
176 void board_init_f(ulong bootflag)
178 DECLARE_GLOBAL_DATA_PTR;
182 init_fnc_t **init_fnc_ptr;
183 ulong addr, addr_sp, len = (ulong)&uboot_end - CFG_MONITOR_BASE;
185 void copy_code (ulong);
188 /* Pointer is writable since we allocated a register for it.
191 memset ((void *)gd, 0, sizeof (gd_t));
193 for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
194 if ((*init_fnc_ptr)() != 0) {
200 * Now that we have DRAM mapped and working, we can
201 * relocate the code and continue running from DRAM.
203 addr = CFG_SDRAM_BASE + gd->ram_size;
205 /* We can reserve some RAM "on top" here.
208 /* round down to next 4 kB limit.
212 printf ("Top of RAM usable for U-Boot at: %08lx\n", addr);
215 /* Reserve memory for U-Boot code, data & bss
216 * round down to next 16 kB limit
219 addr &= ~(16 * 1024 - 1);
222 printf ("Reserving %ldk for U-Boot at: %08lx\n", len >> 10, addr);
225 /* Reserve memory for malloc() arena.
227 addr_sp = addr - TOTAL_MALLOC_LEN;
229 printf ("Reserving %dk for malloc() at: %08lx\n",
230 TOTAL_MALLOC_LEN >> 10, addr_sp);
234 * (permanently) allocate a Board Info struct
235 * and a permanent copy of the "global" data
237 addr_sp -= sizeof(bd_t);
238 bd = (bd_t *)addr_sp;
241 printf ("Reserving %d Bytes for Board Info at: %08lx\n",
242 sizeof(bd_t), addr_sp);
244 addr_sp -= sizeof(gd_t);
245 id = (gd_t *)addr_sp;
247 printf ("Reserving %d Bytes for Global Data at: %08lx\n",
248 sizeof (gd_t), addr_sp);
251 /* Reserve memory for boot params.
253 addr_sp -= CFG_BOOTPARAMS_LEN;
254 bd->bi_boot_params = addr_sp;
256 printf ("Reserving %dk for malloc() at: %08lx\n",
257 CFG_BOOTPARAMS_LEN >> 10, addr_sp);
261 * Finally, we set up a new (bigger) stack.
263 * Leave some safety gap for SP, force alignment on 16 byte boundary
264 * Clear initial stack frame
268 *((ulong *) addr_sp)-- = 0;
269 *((ulong *) addr_sp)-- = 0;
271 printf ("Stack Pointer at: %08lx\n", addr_sp);
274 * Save local variables to board info struct
276 bd->bi_memstart = CFG_SDRAM_BASE; /* start of DRAM memory */
277 bd->bi_memsize = gd->ram_size; /* size of DRAM memory in bytes */
278 bd->bi_baudrate = gd->baudrate; /* Console Baudrate */
280 memcpy (id, (void *)gd, sizeof (gd_t));
282 /* On the purple board we copy the code in a special way
283 * in order to solve flash problems
289 relocate_code (addr_sp, id, addr);
291 /* NOTREACHED - relocate_code() does not return */
293 /************************************************************************
295 * This is the next part if the initialization sequence: we are now
296 * running from RAM and have a "normal" C environment, i. e. global
297 * data can be written, BSS has been cleared, the stack size in not
298 * that critical any more, etc.
300 ************************************************************************
303 void board_init_r (gd_t *id, ulong dest_addr)
305 DECLARE_GLOBAL_DATA_PTR;
308 extern void malloc_bin_reloc (void);
309 #ifndef CFG_ENV_IS_NOWHERE
310 extern char * env_name_spec;
317 gd->flags |= GD_FLG_RELOC; /* tell others: relocation done */
320 printf ("Now running in RAM - U-Boot at: %08lx\n", dest_addr);
323 gd->reloc_off = dest_addr - CFG_MONITOR_BASE;
325 monitor_flash_len = (ulong)&uboot_end_data - dest_addr;
328 * We have to relocate the command table manually
330 for (cmdtp = &__u_boot_cmd_start; cmdtp != &__u_boot_cmd_end; cmdtp++) {
333 addr = (ulong) (cmdtp->cmd) + gd->reloc_off;
335 printf ("Command \"%s\": 0x%08lx => 0x%08lx\n",
336 cmdtp->name, (ulong) (cmdtp->cmd), addr);
339 (int (*)(struct cmd_tbl_s *, int, int, char *[]))addr;
341 addr = (ulong)(cmdtp->name) + gd->reloc_off;
342 cmdtp->name = (char *)addr;
345 addr = (ulong)(cmdtp->usage) + gd->reloc_off;
346 cmdtp->usage = (char *)addr;
350 addr = (ulong)(cmdtp->help) + gd->reloc_off;
351 cmdtp->help = (char *)addr;
355 /* there are some other pointer constants we must deal with */
356 #ifndef CFG_ENV_IS_NOWHERE
357 env_name_spec += gd->reloc_off;
360 /* configure available FLASH banks */
362 display_flash_config (size);
365 bd->bi_flashstart = CFG_FLASH_BASE;
366 bd->bi_flashsize = size;
367 #if CFG_MONITOR_BASE == CFG_FLASH_BASE
368 bd->bi_flashoffset = monitor_flash_len; /* reserved area for U-Boot */
370 bd->bi_flashoffset = 0;
373 /* initialize malloc() area */
377 /* relocate environment function pointers etc. */
380 /* board MAC address */
381 s = getenv ("ethaddr");
382 for (i = 0; i < 6; ++i) {
383 bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
385 s = (*e) ? e + 1 : e;
389 bd->bi_ip_addr = getenv_IPaddr("ipaddr");
391 /** leave this here (after malloc(), environment and PCI are working) **/
392 /* Initialize devices */
397 /* Initialize the console (after the relocation and devices init) */
399 /** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** **/
401 /* Initialize from environment */
402 if ((s = getenv ("loadaddr")) != NULL) {
403 load_addr = simple_strtoul (s, NULL, 16);
405 #if (CONFIG_COMMANDS & CFG_CMD_NET)
406 if ((s = getenv ("bootfile")) != NULL) {
407 copy_filename (BootFile, s, sizeof (BootFile));
409 #endif /* CFG_CMD_NET */
411 #if defined(CONFIG_MISC_INIT_R)
412 /* miscellaneous platform dependent initialisations */
416 #if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(CONFIG_NET_MULTI)
418 eth_initialize(gd->bd);
421 /* main_loop() can return to retry autoboot, if so just run it again. */
426 /* NOTREACHED - no way out of command loop except booting */
431 puts ("### ERROR ### Please RESET the board ###\n");