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 extern long _i386boot_start;
42 extern long _i386boot_end;
43 extern long _i386boot_romdata_start;
44 extern long _i386boot_romdata_dest;
45 extern long _i386boot_romdata_size;
46 extern long _i386boot_bss_start;
47 extern long _i386boot_bss_size;
49 extern long _i386boot_realmode;
50 extern long _i386boot_realmode_size;
51 extern long _i386boot_bios;
52 extern long _i386boot_bios_size;
54 /* The symbols defined by the linker script becomes pointers
55 * which is somewhat inconveient ... */
56 ulong i386boot_start = (ulong)&_i386boot_start; /* code start (in flash) defined in start.S */
57 ulong i386boot_end = (ulong)&_i386boot_end; /* code end (in flash) */
58 ulong i386boot_romdata_start = (ulong)&_i386boot_romdata_start; /* datasegment in flash (also code+rodata end) */
59 ulong i386boot_romdata_dest = (ulong)&_i386boot_romdata_dest; /* data location segment in ram */
60 ulong i386boot_romdata_size = (ulong)&_i386boot_romdata_size; /* size of data segment */
61 ulong i386boot_bss_start = (ulong)&_i386boot_bss_start; /* bss start */
62 ulong i386boot_bss_size = (ulong)&_i386boot_bss_size; /* bss size */
64 ulong i386boot_realmode = (ulong)&_i386boot_realmode; /* start of realmode entry code */
65 ulong i386boot_realmode_size = (ulong)&_i386boot_realmode_size; /* size of realmode entry code */
66 ulong i386boot_bios = (ulong)&_i386boot_bios; /* start of BIOS emulation code */
67 ulong i386boot_bios_size = (ulong)&_i386boot_bios_size; /* size of BIOS emulation code */
70 const char version_string[] =
71 U_BOOT_VERSION" (" __DATE__ " - " __TIME__ ")";
75 * Begin and End of memory area for malloc(), and current "brk"
77 static ulong mem_malloc_start = 0;
78 static ulong mem_malloc_end = 0;
79 static ulong mem_malloc_brk = 0;
81 static int mem_malloc_init(void)
83 DECLARE_GLOBAL_DATA_PTR;
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 DECLARE_GLOBAL_DATA_PTR;
135 char tmp[64]; /* long enough for environment variables */
136 int i = getenv_r("baudrate", tmp, 64);
138 gd->baudrate = (i != 0)
139 ? (int) simple_strtoul (tmp, NULL, 10)
145 static int display_banner (void)
148 printf ("\n\n%s\n\n", version_string);
149 printf ("U-Boot code: %08lX -> %08lX data: %08lX -> %08lX\n"
150 " BSS: %08lX -> %08lX stack: %08lX -> %08lX\n",
151 i386boot_start, i386boot_romdata_start-1,
152 i386boot_romdata_dest, i386boot_romdata_dest+i386boot_romdata_size-1,
153 i386boot_bss_start, i386boot_bss_start+i386boot_bss_size-1,
154 i386boot_bss_start+i386boot_bss_size,
155 i386boot_bss_start+i386boot_bss_size+CFG_STACK_SIZE-1);
162 * WARNING: this code looks "cleaner" than the PowerPC version, but
163 * has the disadvantage that you either get nothing, or everything.
164 * On PowerPC, you might see "DRAM: " before the system hangs - which
165 * gives a simple yet clear indication which part of the
166 * initialization if failing.
168 static int display_dram_config (void)
170 DECLARE_GLOBAL_DATA_PTR;
173 puts ("DRAM Configuration:\n");
175 for (i=0; i<CONFIG_NR_DRAM_BANKS; i++) {
176 printf ("Bank #%d: %08lx ", i, gd->bd->bi_dram[i].start);
177 print_size (gd->bd->bi_dram[i].size, "\n");
183 static void display_flash_config (ulong size)
186 print_size (size, "\n");
191 * Breath some life into the board...
193 * Initialize an SMC for serial comms, and carry out some hardware
196 * The first part of initialization is running from Flash memory;
197 * its main purpose is to initialize the RAM so that we
198 * can relocate the monitor code to RAM.
202 * All attempts to come up with a "common" initialization sequence
203 * that works for all boards and architectures failed: some of the
204 * requirements are just _too_ different. To get rid of the resulting
205 * mess of board dependend #ifdef'ed code we now make the whole
206 * initialization sequence configurable to the user.
208 * The requirements for any new initalization function is simple: it
209 * receives a pointer to the "global data" structure as it's only
210 * argument, and returns an integer return code, where 0 means
211 * "continue" and != 0 means "fatal error, hang the system".
213 typedef int (init_fnc_t) (void);
215 init_fnc_t *init_sequence[] = {
216 cpu_init, /* basic cpu dependent setup */
217 board_init, /* basic board dependent setup */
218 dram_init, /* configure available RAM banks */
219 mem_malloc_init, /* dependant on dram_init */
220 interrupt_init, /* set up exceptions */
223 env_init, /* initialize environment */
224 init_baudrate, /* initialze baudrate settings */
225 serial_init, /* serial communications setup */
234 void start_i386boot (void)
236 DECLARE_GLOBAL_DATA_PTR;
242 init_fnc_t **init_fnc_ptr;
244 show_boot_progress(0x21);
246 gd = global_data = &gd_data;
248 memset (gd, 0, sizeof (gd_t));
250 memset (gd->bd, 0, sizeof (bd_t));
251 show_boot_progress(0x22);
253 gd->baudrate = CONFIG_BAUDRATE;
255 for (init_fnc_ptr = init_sequence, i=0; *init_fnc_ptr; ++init_fnc_ptr, i++) {
256 show_boot_progress(0xa130|i);
258 if ((*init_fnc_ptr)() != 0) {
262 show_boot_progress(0x23);
264 /* configure available FLASH banks */
266 display_flash_config(size);
267 show_boot_progress(0x24);
269 show_boot_progress(0x25);
271 /* initialize environment */
273 show_boot_progress(0x26);
277 bd_data.bi_ip_addr = getenv_IPaddr ("ipaddr");
286 i = getenv_r ("ethaddr", tmp, sizeof (tmp));
287 s = (i > 0) ? tmp : NULL;
289 for (reg = 0; reg < 6; ++reg) {
290 bd_data.bi_enetaddr[reg] = s ? simple_strtoul (s, &e, 16) : 0;
292 s = (*e) ? e + 1 : e;
296 #if defined(CONFIG_PCI)
298 * Do pci configuration
303 show_boot_progress(0x27);
310 /* Initialize the console (after the relocation and devices init) */
313 #ifdef CONFIG_MISC_INIT_R
314 /* miscellaneous platform dependent initialisations */
319 #if (CONFIG_COMMANDS & CFG_CMD_NET) && (0)
322 puts ("Reset Ethernet PHY\n");
327 #if (CONFIG_COMMANDS & CFG_CMD_PCMCIA) && !(CONFIG_COMMANDS & CFG_CMD_IDE)
333 #if (CONFIG_COMMANDS & CFG_CMD_KGDB)
339 /* enable exceptions */
341 show_boot_progress(0x28);
343 /* Must happen after interrupts are initialized since
344 * an irq handler gets installed
346 #if CONFIG_SERIAL_SOFTWARE_FIFO
347 serial_buffered_init();
350 #ifdef CONFIG_STATUS_LED
351 status_led_set (STATUS_LED_BOOT, STATUS_LED_BLINKING);
358 /* Initialize from environment */
359 if ((s = getenv ("loadaddr")) != NULL) {
360 load_addr = simple_strtoul (s, NULL, 16);
362 #if (CONFIG_COMMANDS & CFG_CMD_NET)
363 if ((s = getenv ("bootfile")) != NULL) {
364 copy_filename (BootFile, s, sizeof (BootFile));
366 #endif /* CFG_CMD_NET */
370 #if (CONFIG_COMMANDS & CFG_CMD_IDE)
374 #endif /* CFG_CMD_IDE */
376 #if (CONFIG_COMMANDS & CFG_CMD_SCSI)
382 #if (CONFIG_COMMANDS & CFG_CMD_DOC)
388 #if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(CONFIG_NET_MULTI)
391 eth_initialize(gd->bd);
394 #ifdef CONFIG_LAST_STAGE_INIT
397 * Some parts can be only initialized if all others (like
398 * Interrupts) are up and running (i.e. the PC-style ISA
406 post_run (NULL, POST_RAM | post_bootmode_get(0));
410 show_boot_progress(0x29);
412 /* main_loop() can return to retry autoboot, if so just run it again. */
417 /* NOTREACHED - no way out of command loop except booting */
422 puts ("### ERROR ### Please RESET the board ###\n");