2 * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
5 * (C) Copyright 2000-2002
8 * See file CREDITS for list of people who contributed to this
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
34 * All attempts to come up with a "common" initialization sequence
35 * that works for all boards and architectures failed: some of the
36 * requirements are just _too_ different. To get rid of the resulting
37 * mess of board dependend #ifdef'ed code we now make the whole
38 * initialization sequence configurable to the user.
40 * The requirements for any new initalization function is simple: it
41 * receives a pointer to the "global data" structure as it's only
42 * argument, and returns an integer return code, where 0 means
43 * "continue" and != 0 means "fatal error, hang the system".
47 extern void malloc_bin_reloc (void);
48 typedef int (init_fnc_t) (void);
49 extern unsigned _vectors[];
52 * Begin and End of memory area for malloc(), and current "brk"
54 static ulong mem_malloc_start = 0;
55 static ulong mem_malloc_end = 0;
56 static ulong mem_malloc_brk = 0;
59 * The Malloc area is immediately below the monitor copy in RAM
61 static void mem_malloc_init (void)
63 mem_malloc_start = CFG_MALLOC_BASE;
64 mem_malloc_end = mem_malloc_start + CFG_MALLOC_LEN;
65 mem_malloc_brk = mem_malloc_start;
66 memset ((void *) mem_malloc_start,
68 mem_malloc_end - mem_malloc_start);
71 void *sbrk (ptrdiff_t increment)
73 ulong old = mem_malloc_brk;
74 ulong new = old + increment;
76 if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
80 return ((void *) old);
84 /************************************************************************
85 * Initialization sequence *
86 ***********************************************************************/
88 init_fnc_t *init_sequence[] = {
90 #if defined(CONFIG_BOARD_PRE_INIT)
91 board_pre_init, /* Call board-specific init code early.*/
100 NULL, /* Terminate this list */
104 /***********************************************************************/
105 void board_init (void)
107 DECLARE_GLOBAL_DATA_PTR;
110 init_fnc_t **init_fnc_ptr;
114 /* Pointer is writable since we allocated a register for it.
115 * Nios treats CFG_GBL_DATA_OFFSET as an address.
117 gd = (gd_t *)CFG_GBL_DATA_OFFSET;
118 memset( gd, 0, CFG_GBL_DATA_SIZE );
120 /* Copy exception vectors to the correct location.
122 memcpy( (void *)CFG_VECT_BASE, _vectors, 256 );
124 gd->bd = (bd_t *)(gd+1); /* At end of global data */
125 gd->baudrate = CONFIG_BAUDRATE;
126 gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
129 bd->bi_memstart = CFG_SDRAM_BASE;
130 bd->bi_memsize = CFG_SDRAM_SIZE;
131 bd->bi_flashstart = CFG_FLASH_BASE;
132 bd->bi_sramstart= CFG_SRAM_BASE;
133 bd->bi_sramsize = CFG_SRAM_SIZE;
134 bd->bi_baudrate = CONFIG_BAUDRATE;
136 for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
137 if ((*init_fnc_ptr) () != 0) {
142 bd->bi_flashsize = flash_init();
148 bd->bi_ip_addr = getenv_IPaddr ("ipaddr");
149 s = getenv ("ethaddr");
150 for (i = 0; i < 6; ++i) {
151 bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
152 if (s) s = (*e) ? e + 1 : e;
170 /***********************************************************************/
174 puts("### ERROR ### Please reset board ###\n");