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 extern ulong uboot_end_data;
46 extern ulong uboot_end;
48 ulong monitor_flash_len;
50 const char version_string[] =
51 U_BOOT_VERSION" (" __DATE__ " - " __TIME__ ")";
53 static char *failed = "*** failed ***\n";
56 * Begin and End of memory area for malloc(), and current "brk"
58 static ulong mem_malloc_start;
59 static ulong mem_malloc_end;
60 static ulong mem_malloc_brk;
64 * The Malloc area is immediately below the monitor copy in DRAM
66 static void mem_malloc_init (void)
68 DECLARE_GLOBAL_DATA_PTR;
70 ulong dest_addr = CFG_MONITOR_BASE + gd->reloc_off;
72 mem_malloc_end = dest_addr;
73 mem_malloc_start = dest_addr - TOTAL_MALLOC_LEN;
74 mem_malloc_brk = mem_malloc_start;
76 memset ((void *) mem_malloc_start,
78 mem_malloc_end - mem_malloc_start);
81 void *sbrk (ptrdiff_t increment)
83 ulong old = mem_malloc_brk;
84 ulong new = old + increment;
86 if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
90 return ((void *) old);
94 static int init_func_ram (void)
96 DECLARE_GLOBAL_DATA_PTR;
98 #ifdef CONFIG_BOARD_TYPES
99 int board_type = gd->board_type;
101 int board_type = 0; /* use dummy arg */
105 if ((gd->ram_size = initdram (board_type)) > 0) {
106 print_size (gd->ram_size, "\n");
113 static int display_banner(void)
116 printf ("\n\n%s\n\n", version_string);
120 static void display_flash_config(ulong size)
123 print_size (size, "\n");
127 static int init_baudrate (void)
129 DECLARE_GLOBAL_DATA_PTR;
131 uchar tmp[64]; /* long enough for environment variables */
132 int i = getenv_r ("baudrate", tmp, sizeof (tmp));
134 gd->baudrate = (i > 0)
135 ? (int) simple_strtoul (tmp, NULL, 10)
143 * Breath some life into the board...
145 * The first part of initialization is running from Flash memory;
146 * its main purpose is to initialize the RAM so that we
147 * can relocate the monitor code to RAM.
151 * All attempts to come up with a "common" initialization sequence
152 * that works for all boards and architectures failed: some of the
153 * requirements are just _too_ different. To get rid of the resulting
154 * mess of board dependend #ifdef'ed code we now make the whole
155 * initialization sequence configurable to the user.
157 * The requirements for any new initalization function is simple: it
158 * receives a pointer to the "global data" structure as it's only
159 * argument, and returns an integer return code, where 0 means
160 * "continue" and != 0 means "fatal error, hang the system".
162 typedef int (init_fnc_t) (void);
164 init_fnc_t *init_sequence[] = {
166 env_init, /* initialize environment */
167 init_baudrate, /* initialze baudrate settings */
168 serial_init, /* serial communications setup */
170 display_banner, /* say that we are here */
177 void board_init_f(ulong bootflag)
179 DECLARE_GLOBAL_DATA_PTR;
183 init_fnc_t **init_fnc_ptr;
184 ulong addr, addr_sp, len = (ulong)&uboot_end - CFG_MONITOR_BASE;
186 void copy_code (ulong);
189 /* Pointer is writable since we allocated a register for it.
192 memset (gd, 0, sizeof (gd_t));
194 for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
195 if ((*init_fnc_ptr)() != 0) {
201 * Now that we have DRAM mapped and working, we can
202 * relocate the code and continue running from DRAM.
204 addr = CFG_SDRAM_BASE + gd->ram_size;
206 /* We can reserve some RAM "on top" here.
209 /* round down to next 4 kB limit.
213 printf ("Top of RAM usable for U-Boot at: %08lx\n", addr);
216 /* Reserve memory for U-Boot code, data & bss
217 * round down to next 16 kB limit
220 addr &= ~(16 * 1024 - 1);
223 printf ("Reserving %ldk for U-Boot at: %08lx\n", len >> 10, addr);
226 /* Reserve memory for malloc() arena.
228 addr_sp = addr - TOTAL_MALLOC_LEN;
230 printf ("Reserving %dk for malloc() at: %08lx\n",
231 TOTAL_MALLOC_LEN >> 10, addr_sp);
235 * (permanently) allocate a Board Info struct
236 * and a permanent copy of the "global" data
238 addr_sp -= sizeof(bd_t);
239 bd = (bd_t *)addr_sp;
242 printf ("Reserving %d Bytes for Board Info at: %08lx\n",
243 sizeof(bd_t), addr_sp);
245 addr_sp -= sizeof(gd_t);
246 id = (gd_t *)addr_sp;
248 printf ("Reserving %d Bytes for Global Data at: %08lx\n",
249 sizeof (gd_t), addr_sp);
252 /* Reserve memory for boot params.
254 addr_sp -= CFG_BOOTPARAMS_LEN;
255 bd->bi_boot_params = addr_sp;
257 printf ("Reserving %dk for malloc() at: %08lx\n",
258 CFG_BOOTPARAMS_LEN >> 10, addr_sp);
262 * Finally, we set up a new (bigger) stack.
264 * Leave some safety gap for SP, force alignment on 16 byte boundary
265 * Clear initial stack frame
269 *((ulong *) addr_sp)-- = 0;
270 *((ulong *) addr_sp)-- = 0;
272 printf ("Stack Pointer at: %08lx\n", addr_sp);
275 * Save local variables to board info struct
277 bd->bi_memstart = CFG_SDRAM_BASE; /* start of DRAM memory */
278 bd->bi_memsize = gd->ram_size; /* size of DRAM memory in bytes */
279 bd->bi_baudrate = gd->baudrate; /* Console Baudrate */
281 memcpy (id, gd, sizeof (gd_t));
283 /* On the purple board we copy the code in a special way
284 * in order to solve flash problems
290 relocate_code (addr_sp, id, addr);
292 /* NOTREACHED - relocate_code() does not return */
294 /************************************************************************
296 * This is the next part if the initialization sequence: we are now
297 * running from RAM and have a "normal" C environment, i. e. global
298 * data can be written, BSS has been cleared, the stack size in not
299 * that critical any more, etc.
301 ************************************************************************
304 void board_init_r (gd_t *id, ulong dest_addr)
306 DECLARE_GLOBAL_DATA_PTR;
309 extern void malloc_bin_reloc (void);
310 #ifndef CFG_ENV_IS_NOWHERE
311 extern char * env_name_spec;
318 gd->flags |= GD_FLG_RELOC; /* tell others: relocation done */
321 printf ("Now running in RAM - U-Boot at: %08lx\n", dest_addr);
324 gd->reloc_off = dest_addr - CFG_MONITOR_BASE;
326 monitor_flash_len = (ulong)&uboot_end_data - dest_addr;
329 * We have to relocate the command table manually
331 for (cmdtp = &__u_boot_cmd_start; cmdtp != &__u_boot_cmd_end; cmdtp++) {
334 addr = (ulong) (cmdtp->cmd) + gd->reloc_off;
336 printf ("Command \"%s\": 0x%08lx => 0x%08lx\n",
337 cmdtp->name, (ulong) (cmdtp->cmd), addr);
340 (int (*)(struct cmd_tbl_s *, int, int, char *[]))addr;
342 addr = (ulong)(cmdtp->name) + gd->reloc_off;
343 cmdtp->name = (char *)addr;
346 addr = (ulong)(cmdtp->usage) + gd->reloc_off;
347 cmdtp->usage = (char *)addr;
351 addr = (ulong)(cmdtp->help) + gd->reloc_off;
352 cmdtp->help = (char *)addr;
356 /* there are some other pointer constants we must deal with */
357 #ifndef CFG_ENV_IS_NOWHERE
358 env_name_spec += gd->reloc_off;
361 /* configure available FLASH banks */
363 display_flash_config (size);
366 bd->bi_flashstart = CFG_FLASH_BASE;
367 bd->bi_flashsize = size;
368 #if CFG_MONITOR_BASE == CFG_FLASH_BASE
369 bd->bi_flashoffset = monitor_flash_len; /* reserved area for U-Boot */
371 bd->bi_flashoffset = 0;
374 /* initialize malloc() area */
378 /* relocate environment function pointers etc. */
381 /* board MAC address */
382 s = getenv ("ethaddr");
383 for (i = 0; i < 6; ++i) {
384 bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
386 s = (*e) ? e + 1 : e;
390 bd->bi_ip_addr = getenv_IPaddr("ipaddr");
392 /** leave this here (after malloc(), environment and PCI are working) **/
393 /* Initialize devices */
396 /* allocate syscalls table (console_init_r will fill it in */
397 syscall_tbl = (void **) malloc (NR_SYSCALLS * sizeof (void *));
399 /* Initialize the console (after the relocation and devices init) */
401 /** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** **/
403 /* Initialize from environment */
404 if ((s = getenv ("loadaddr")) != NULL) {
405 load_addr = simple_strtoul (s, NULL, 16);
407 #if (CONFIG_COMMANDS & CFG_CMD_NET)
408 if ((s = getenv ("bootfile")) != NULL) {
409 copy_filename (BootFile, s, sizeof (BootFile));
411 #endif /* CFG_CMD_NET */
413 #if defined(CONFIG_MISC_INIT_R)
414 /* miscellaneous platform dependent initialisations */
418 #if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(CONFIG_NET_MULTI)
420 eth_initialize(gd->bd);
423 /* main_loop() can return to retry autoboot, if so just run it again. */
428 /* NOTREACHED - no way out of command loop except booting */
433 puts ("### ERROR ### Please RESET the board ###\n");