3 * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
6 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
9 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
10 * Marius Groeger <mgroeger@sysgo.de>
12 * See file CREDITS for list of people who contributed to this
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation; either version 2 of
18 * the License, or (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
39 #include <asm/u-boot-i386.h>
41 DECLARE_GLOBAL_DATA_PTR;
43 extern long _i386boot_start;
44 extern long _i386boot_end;
45 extern long _i386boot_romdata_start;
46 extern long _i386boot_romdata_dest;
47 extern long _i386boot_romdata_size;
48 extern long _i386boot_bss_start;
49 extern long _i386boot_bss_size;
51 extern long _i386boot_realmode;
52 extern long _i386boot_realmode_size;
53 extern long _i386boot_bios;
54 extern long _i386boot_bios_size;
56 /* The symbols defined by the linker script becomes pointers
57 * which is somewhat inconveient ... */
58 ulong i386boot_start = (ulong)&_i386boot_start; /* code start (in flash) defined in start.S */
59 ulong i386boot_end = (ulong)&_i386boot_end; /* code end (in flash) */
60 ulong i386boot_romdata_start = (ulong)&_i386boot_romdata_start; /* datasegment in flash (also code+rodata end) */
61 ulong i386boot_romdata_dest = (ulong)&_i386boot_romdata_dest; /* data location segment in ram */
62 ulong i386boot_romdata_size = (ulong)&_i386boot_romdata_size; /* size of data segment */
63 ulong i386boot_bss_start = (ulong)&_i386boot_bss_start; /* bss start */
64 ulong i386boot_bss_size = (ulong)&_i386boot_bss_size; /* bss size */
66 ulong i386boot_realmode = (ulong)&_i386boot_realmode; /* start of realmode entry code */
67 ulong i386boot_realmode_size = (ulong)&_i386boot_realmode_size; /* size of realmode entry code */
68 ulong i386boot_bios = (ulong)&_i386boot_bios; /* start of BIOS emulation code */
69 ulong i386boot_bios_size = (ulong)&_i386boot_bios_size; /* size of BIOS emulation code */
72 const char version_string[] =
73 U_BOOT_VERSION" (" __DATE__ " - " __TIME__ ")";
77 * Begin and End of memory area for malloc(), and current "brk"
79 static ulong mem_malloc_start = 0;
80 static ulong mem_malloc_end = 0;
81 static ulong mem_malloc_brk = 0;
83 static int mem_malloc_init(void)
85 /* start malloc area right after the stack */
86 mem_malloc_start = i386boot_bss_start +
87 i386boot_bss_size + CFG_STACK_SIZE;
88 mem_malloc_start = (mem_malloc_start+3)&~3;
90 /* Use all available RAM for malloc() */
91 mem_malloc_end = gd->ram_size;
93 mem_malloc_brk = mem_malloc_start;
98 void *sbrk (ptrdiff_t increment)
100 ulong old = mem_malloc_brk;
101 ulong new = old + increment;
103 if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
106 mem_malloc_brk = new;
108 return ((void *) old);
111 char *strmhz (char *buf, long hz)
117 l = sprintf (buf, "%ld", n);
118 m = (hz % 1000000L) / 1000L;
120 sprintf (buf + l, ".%03ld", m);
124 /************************************************************************
126 ************************************************************************
127 * Some of this code should be moved into the core functions,
128 * or dropped completely,
129 * but let's get it working (again) first...
131 static int init_baudrate (void)
133 char tmp[64]; /* long enough for environment variables */
134 int i = getenv_r("baudrate", tmp, 64);
136 gd->baudrate = (i != 0)
137 ? (int) simple_strtoul (tmp, NULL, 10)
143 static int display_banner (void)
146 printf ("\n\n%s\n\n", version_string);
147 printf ("U-Boot code: %08lX -> %08lX data: %08lX -> %08lX\n"
148 " BSS: %08lX -> %08lX stack: %08lX -> %08lX\n",
149 i386boot_start, i386boot_romdata_start-1,
150 i386boot_romdata_dest, i386boot_romdata_dest+i386boot_romdata_size-1,
151 i386boot_bss_start, i386boot_bss_start+i386boot_bss_size-1,
152 i386boot_bss_start+i386boot_bss_size,
153 i386boot_bss_start+i386boot_bss_size+CFG_STACK_SIZE-1);
160 * WARNING: this code looks "cleaner" than the PowerPC version, but
161 * has the disadvantage that you either get nothing, or everything.
162 * On PowerPC, you might see "DRAM: " before the system hangs - which
163 * gives a simple yet clear indication which part of the
164 * initialization if failing.
166 static int display_dram_config (void)
170 puts ("DRAM Configuration:\n");
172 for (i=0; i<CONFIG_NR_DRAM_BANKS; i++) {
173 printf ("Bank #%d: %08lx ", i, gd->bd->bi_dram[i].start);
174 print_size (gd->bd->bi_dram[i].size, "\n");
180 static void display_flash_config (ulong size)
183 print_size (size, "\n");
188 * Breath some life into the board...
190 * Initialize an SMC for serial comms, and carry out some hardware
193 * The first part of initialization is running from Flash memory;
194 * its main purpose is to initialize the RAM so that we
195 * can relocate the monitor code to RAM.
199 * All attempts to come up with a "common" initialization sequence
200 * that works for all boards and architectures failed: some of the
201 * requirements are just _too_ different. To get rid of the resulting
202 * mess of board dependend #ifdef'ed code we now make the whole
203 * initialization sequence configurable to the user.
205 * The requirements for any new initalization function is simple: it
206 * receives a pointer to the "global data" structure as it's only
207 * argument, and returns an integer return code, where 0 means
208 * "continue" and != 0 means "fatal error, hang the system".
210 typedef int (init_fnc_t) (void);
212 init_fnc_t *init_sequence[] = {
213 cpu_init, /* basic cpu dependent setup */
214 board_init, /* basic board dependent setup */
215 dram_init, /* configure available RAM banks */
216 mem_malloc_init, /* dependant on dram_init */
217 interrupt_init, /* set up exceptions */
220 env_init, /* initialize environment */
221 init_baudrate, /* initialze baudrate settings */
222 serial_init, /* serial communications setup */
231 void start_i386boot (void)
238 init_fnc_t **init_fnc_ptr;
240 show_boot_progress(0x21);
242 gd = global_data = &gd_data;
243 /* compiler optimization barrier needed for GCC >= 3.4 */
244 __asm__ __volatile__("": : :"memory");
246 memset (gd, 0, sizeof (gd_t));
248 memset (gd->bd, 0, sizeof (bd_t));
249 show_boot_progress(0x22);
251 gd->baudrate = CONFIG_BAUDRATE;
253 for (init_fnc_ptr = init_sequence, i=0; *init_fnc_ptr; ++init_fnc_ptr, i++) {
254 show_boot_progress(0xa130|i);
256 if ((*init_fnc_ptr)() != 0) {
260 show_boot_progress(0x23);
262 /* configure available FLASH banks */
264 display_flash_config(size);
265 show_boot_progress(0x24);
267 show_boot_progress(0x25);
269 /* initialize environment */
271 show_boot_progress(0x26);
275 bd_data.bi_ip_addr = getenv_IPaddr ("ipaddr");
284 i = getenv_r ("ethaddr", tmp, sizeof (tmp));
285 s = (i > 0) ? tmp : NULL;
287 for (reg = 0; reg < 6; ++reg) {
288 bd_data.bi_enetaddr[reg] = s ? simple_strtoul (s, &e, 16) : 0;
290 s = (*e) ? e + 1 : e;
294 #if defined(CONFIG_PCI)
296 * Do pci configuration
301 show_boot_progress(0x27);
308 /* Initialize the console (after the relocation and devices init) */
311 #ifdef CONFIG_MISC_INIT_R
312 /* miscellaneous platform dependent initialisations */
316 #if defined(CONFIG_CMD_PCMCIA) && !defined(CONFIG_CMD_IDE)
322 #if defined(CONFIG_CMD_KGDB)
328 /* enable exceptions */
330 show_boot_progress(0x28);
332 /* Must happen after interrupts are initialized since
333 * an irq handler gets installed
335 #ifdef CONFIG_SERIAL_SOFTWARE_FIFO
336 serial_buffered_init();
339 #ifdef CONFIG_STATUS_LED
340 status_led_set (STATUS_LED_BOOT, STATUS_LED_BLINKING);
347 /* Initialize from environment */
348 if ((s = getenv ("loadaddr")) != NULL) {
349 load_addr = simple_strtoul (s, NULL, 16);
351 #if defined(CONFIG_CMD_NET)
352 if ((s = getenv ("bootfile")) != NULL) {
353 copy_filename (BootFile, s, sizeof (BootFile));
359 #if defined(CONFIG_CMD_IDE)
365 #if defined(CONFIG_CMD_SCSI)
371 #if defined(CONFIG_CMD_DOC)
377 #if defined(CONFIG_CMD_NET)
378 #if defined(CONFIG_NET_MULTI)
382 eth_initialize(gd->bd);
385 #if ( defined(CONFIG_CMD_NET)) && (0)
388 puts ("Reset Ethernet PHY\n");
393 #ifdef CONFIG_LAST_STAGE_INIT
396 * Some parts can be only initialized if all others (like
397 * Interrupts) are up and running (i.e. the PC-style ISA
405 post_run (NULL, POST_RAM | post_bootmode_get(0));
409 show_boot_progress(0x29);
411 /* main_loop() can return to retry autoboot, if so just run it again. */
416 /* NOTREACHED - no way out of command loop except booting */
421 puts ("### ERROR ### Please RESET the board ###\n");