2 * U-boot - i386 Startup Code
4 * Copyright (c) 2002 Omicron Ceti AB, Daniel Engström <denaiel@omicron.se>
6 * See file CREDITS for list of people who contributed to this
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
33 .type _start, @function
34 .globl _i386boot_start
37 movl $0x18,%eax /* Load our segement registes, the
38 * gdt have already been loaded by start16.S */
45 /* We call a few functions in the board support package
46 * since we have no stack yet we'll have to use %ebp
47 * to store the return address */
49 /* Early platform init (setup gpio, etc ) */
50 mov $early_board_init_ret, %ebp
54 /* The __port80 entry-point should be usabe by now */
55 /* so we try to indicate progress */
57 movl $.progress0, %ebp
58 jmp show_boot_progress_asm
62 mov $mem_init_ret, %ebp
66 /* fetch memory size (into %eax) */
67 mov $get_mem_size_ret, %ebp
71 /* Check we have enough memory for stack */
72 movl $CONFIG_SYS_STACK_SIZE, %ecx
76 /* indicate (lack of) progress */
78 movl $.progress0a, %ebp
79 jmp show_boot_progress_asm
83 /* Set stack pointer to upper memory limit*/
86 /* indicate progress */
88 movl $.progress1, %ebp
89 jmp show_boot_progress_asm
99 cmpl $0x55aa55aa, %ebx
103 /* indicate (lack of) progress */
105 movl $.progress1a, %ebp
106 jmp show_boot_progress_asm
112 /* indicate progress */
114 movl $.progress2, %ebp
115 jmp show_boot_progress_asm
120 /* Get upper memory limit */
122 subl $CONFIG_SYS_STACK_SIZE, %ecx
124 /* Create a Stack Frame */
128 /* stack_limit parameter */
130 call board_init_f /* Enter, U-boot! */
132 /* indicate (lack of) progress */
134 movl $.progress4a, %ebp
135 jmp show_boot_progress_asm