2 * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
3 * Scott McNutt <smcnutt@psyent.com>
5 * (C) Copyright 2000-2002
6 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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,
33 * All attempts to come up with a "common" initialization sequence
34 * that works for all boards and architectures failed: some of the
35 * requirements are just _too_ different. To get rid of the resulting
36 * mess of board dependend #ifdef'ed code we now make the whole
37 * initialization sequence configurable to the user.
39 * The requirements for any new initalization function is simple: it
40 * receives a pointer to the "global data" structure as it's only
41 * argument, and returns an integer return code, where 0 means
42 * "continue" and != 0 means "fatal error, hang the system".
46 extern void malloc_bin_reloc (void);
47 typedef int (init_fnc_t) (void);
48 extern unsigned _vectors[];
51 * Begin and End of memory area for malloc(), and current "brk"
53 static ulong mem_malloc_start = 0;
54 static ulong mem_malloc_end = 0;
55 static ulong mem_malloc_brk = 0;
58 * The Malloc area is immediately below the monitor copy in RAM
60 static void mem_malloc_init (void)
62 mem_malloc_start = CFG_MALLOC_BASE;
63 mem_malloc_end = mem_malloc_start + CFG_MALLOC_LEN;
64 mem_malloc_brk = mem_malloc_start;
65 memset ((void *) mem_malloc_start,
67 mem_malloc_end - mem_malloc_start);
70 void *sbrk (ptrdiff_t increment)
72 ulong old = mem_malloc_brk;
73 ulong new = old + increment;
75 if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
79 return ((void *) old);
83 /************************************************************************
84 * Initialization sequence *
85 ***********************************************************************/
87 init_fnc_t *init_sequence[] = {
89 #if defined(CONFIG_BOARD_PRE_INIT)
90 board_pre_init, /* Call board-specific init code early.*/
99 NULL, /* Terminate this list */
103 /***********************************************************************/
104 void board_init (void)
106 DECLARE_GLOBAL_DATA_PTR;
109 init_fnc_t **init_fnc_ptr;
111 /* Pointer is writable since we allocated a register for it.
112 * Nios treats CFG_GBL_DATA_OFFSET as an address.
114 gd = (gd_t *)CFG_GBL_DATA_OFFSET;
115 memset( gd, 0, CFG_GBL_DATA_SIZE );
117 /* Copy exception vectors to the correct location.
119 memcpy( (void *)CFG_VECT_BASE, _vectors, 256 );
121 gd->bd = (bd_t *)(gd+1); /* At end of global data */
122 gd->baudrate = CONFIG_BAUDRATE;
123 gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
126 bd->bi_memstart = CFG_SDRAM_BASE;
127 bd->bi_memsize = CFG_SDRAM_SIZE;
128 bd->bi_flashstart = CFG_FLASH_BASE;
129 bd->bi_sramstart= CFG_SRAM_BASE;
130 bd->bi_sramsize = CFG_SRAM_SIZE;
131 bd->bi_baudrate = CONFIG_BAUDRATE;
133 for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
134 if ((*init_fnc_ptr) () != 0) {
139 bd->bi_flashsize = flash_init();
160 /***********************************************************************/
164 puts("### ERROR ### Please reset board ###\n");