1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
|
/*
* (C) Copyright 2008-2011
* Graeme Russ, <graeme.russ@gmail.com>
*
* (C) Copyright 2002
* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
*
* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <watchdog.h>
#include <stdio_dev.h>
#include <asm/u-boot-x86.h>
#include <asm/relocate.h>
#include <asm/processor.h>
#include <asm/init_helpers.h>
#include <asm/init_wrappers.h>
/*
* Breath some life into the board...
*
* Getting the board up and running is a three-stage process:
* 1) Execute from Flash, SDRAM Uninitialised
* At this point, there is a limited amount of non-SDRAM memory
* (typically the CPU cache, but can also be SRAM or even a buffer of
* of some peripheral). This limited memory is used to hold:
* - The initial copy of the Global Data Structure
* - A temporary stack
* - A temporary x86 Global Descriptor Table
* - The pre-console buffer (if enabled)
*
* The following is performed during this phase of execution:
* - Core low-level CPU initialisation
* - Console initialisation
* - SDRAM initialisation
*
* 2) Execute from Flash, SDRAM Initialised
* At this point we copy Global Data from the initial non-SDRAM
* memory and set up the permanent stack in SDRAM. The CPU cache is no
* longer being used as temporary memory, so we can now fully enable
* it.
*
* The following is performed during this phase of execution:
* - Create final stack in SDRAM
* - Copy Global Data from temporary memory to SDRAM
* - Enabling of CPU cache(s),
* - Copying of U-Boot code and data from Flash to RAM
* - Clearing of the BSS
* - ELF relocation adjustments
*
* 3) Execute from SDRAM
* The following is performed during this phase of execution:
* - All remaining initialisation
*/
/*
* The requirements for any new initalization function is simple: it is
* a function with no parameters which returns an integer return code,
* where 0 means "continue" and != 0 means "fatal error, hang the system"
*/
typedef int (init_fnc_t) (void);
/*
* init_sequence_f is the list of init functions which are run when U-Boot
* is executing from Flash with a limited 'C' environment. The following
* limitations must be considered when implementing an '_f' function:
* - 'static' variables are read-only
* - Global Data (gd->xxx) is read/write
* - Stack space is limited
*
* The '_f' sequence must, as a minimum, initialise SDRAM. It _should_
* also initialise the console (to provide early debug output)
*/
init_fnc_t *init_sequence_f[] = {
cpu_init_f,
board_early_init_f,
env_init,
init_baudrate_f,
serial_init,
console_init_f,
dram_init_f,
calculate_relocation_address,
NULL,
};
/*
* init_sequence_f_r is the list of init functions which are run when
* U-Boot is executing from Flash with a semi-limited 'C' environment.
* The following limitations must be considered when implementing an
* '_f_r' function:
* - 'static' variables are read-only
* - Global Data (gd->xxx) is read/write
*
* The '_f_r' sequence must, as a minimum, copy U-Boot to RAM (if
* supported). It _should_, if possible, copy global data to RAM and
* initialise the CPU caches (to speed up the relocation process)
*/
init_fnc_t *init_sequence_f_r[] = {
init_cache_f_r,
copy_uboot_to_ram,
clear_bss,
do_elf_reloc_fixups,
NULL,
};
/*
* init_sequence_r is the list of init functions which are run when U-Boot
* is executing from RAM with a full 'C' environment. There are no longer
* any limitations which must be considered when implementing an '_r'
* function, (i.e.'static' variables are read/write)
*
* If not already done, the '_r' sequence must copy global data to RAM and
* (should) initialise the CPU caches.
*/
init_fnc_t *init_sequence_r[] = {
set_reloc_flag_r,
init_bd_struct_r,
mem_malloc_init_r,
cpu_init_r,
board_early_init_r,
dram_init,
interrupt_init,
timer_init,
display_banner,
display_dram_config,
serial_initialize_r,
#ifndef CONFIG_SYS_NO_FLASH
flash_init_r,
#endif
#ifdef CONFIG_SPI
init_func_spi;
#endif
env_relocate_r,
#ifdef CONFIG_PCI
pci_init_r,
#endif
stdio_init,
jumptable_init_r,
console_init_r,
#ifdef CONFIG_MISC_INIT_R
misc_init_r,
#endif
#if defined(CONFIG_CMD_KGDB)
kgdb_init_r,
#endif
enable_interrupts_r,
#ifdef CONFIG_STATUS_LED
status_led_set_r,
#endif
set_load_addr_r,
#if defined(CONFIG_CMD_IDE)
ide_init_r,
#endif
#if defined(CONFIG_CMD_SCSI)
scsi_init_r,
#endif
#if defined(CONFIG_CMD_DOC)
doc_init_r,
#endif
#ifdef CONFIG_BITBANGMII
bb_miiphy_init_r,
#endif
#if defined(CONFIG_CMD_NET)
eth_initialize_r,
#ifdef CONFIG_RESET_PHY_R
reset_phy_r,
#endif
#endif
#ifdef CONFIG_LAST_STAGE_INIT
last_stage_init,
#endif
NULL,
};
static void do_init_loop(init_fnc_t **init_fnc_ptr)
{
for (; *init_fnc_ptr; ++init_fnc_ptr) {
WATCHDOG_RESET();
if ((*init_fnc_ptr)() != 0)
hang();
}
}
void board_init_f(ulong boot_flags)
{
gd->flags = boot_flags;
do_init_loop(init_sequence_f);
/*
* SDRAM and console are now initialised. The final stack can now
* be setup in SDRAM. Code execution will continue in Flash, but
* with the stack in SDRAM and Global Data in temporary memory
* (CPU cache)
*/
board_init_f_r_trampoline(gd->start_addr_sp);
/* NOTREACHED - board_init_f_r_trampoline() does not return */
while (1)
;
}
void board_init_f_r(void)
{
do_init_loop(init_sequence_f_r);
/*
* U-Boot has been copied into SDRAM, the BSS has been cleared etc.
* Transfer execution from Flash to RAM by calculating the address
* of the in-RAM copy of board_init_r() and calling it
*/
(board_init_r + gd->reloc_off)(gd, gd->relocaddr);
/* NOTREACHED - board_init_r() does not return */
while (1)
;
}
void board_init_r(gd_t *id, ulong dest_addr)
{
do_init_loop(init_sequence_r);
/* main_loop() can return to retry autoboot, if so just run it again. */
for (;;)
main_loop();
/* NOTREACHED - no way out of command loop except booting */
}
void hang(void)
{
puts("### ERROR ### Please RESET the board ###\n");
for (;;)
;
}
|
