2 * (C) Copyright 2008-2011
3 * Graeme Russ, <graeme.russ@gmail.com>
6 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
9 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
12 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
13 * Marius Groeger <mgroeger@sysgo.de>
15 * See file CREDITS for list of people who contributed to this
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License as
20 * published by the Free Software Foundation; either version 2 of
21 * the License, or (at your option) any later version.
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
36 #include <stdio_dev.h>
37 #include <asm/u-boot-x86.h>
38 #include <asm/processor.h>
40 #include <asm/init_helpers.h>
41 #include <asm/init_wrappers.h>
44 * Breath some life into the board...
46 * Initialize an SMC for serial comms, and carry out some hardware
49 * The first part of initialization is running from Flash memory;
50 * its main purpose is to initialize the RAM so that we
51 * can relocate the monitor code to RAM.
55 * All attempts to come up with a "common" initialization sequence
56 * that works for all boards and architectures failed: some of the
57 * requirements are just _too_ different. To get rid of the resulting
58 * mess of board dependend #ifdef'ed code we now make the whole
59 * initialization sequence configurable to the user.
61 * The requirements for any new initalization function is simple: it
62 * receives a pointer to the "global data" structure as it's only
63 * argument, and returns an integer return code, where 0 means
64 * "continue" and != 0 means "fatal error, hang the system".
66 typedef int (init_fnc_t) (void);
68 static int calculate_relocation_address(void);
69 static int copy_gd_to_ram(void);
71 init_fnc_t *init_sequence_f[] = {
79 calculate_relocation_address,
84 init_fnc_t *init_sequence_r[] = {
94 #ifdef CONFIG_SERIAL_MULTI
97 #ifndef CONFIG_SYS_NO_FLASH
101 #ifdef CONFIG_CMD_NET
110 #ifdef CONFIG_MISC_INIT_R
113 #if defined(CONFIG_CMD_PCMCIA) && !defined(CONFIG_CMD_IDE)
116 #if defined(CONFIG_CMD_KGDB)
120 #ifdef CONFIG_STATUS_LED
124 #if defined(CONFIG_CMD_NET)
127 #if defined(CONFIG_CMD_IDE)
130 #if defined(CONFIG_CMD_SCSI)
133 #if defined(CONFIG_CMD_DOC)
136 #ifdef CONFIG_BITBANGMII
139 #if defined(CONFIG_CMD_NET)
141 #ifdef CONFIG_RESET_PHY_R
145 #ifdef CONFIG_LAST_STAGE_INIT
151 static void do_init_loop(init_fnc_t **init_fnc_ptr)
153 for (; *init_fnc_ptr; ++init_fnc_ptr) {
155 if ((*init_fnc_ptr)() != 0)
160 static int calculate_relocation_address(void)
162 ulong text_start = (ulong)&__text_start;
163 ulong bss_end = (ulong)&__bss_end;
167 * NOTE: All destination address are rounded down to 16-byte
168 * boundary to satisfy various worst-case alignment
172 /* Global Data is at top of available memory */
173 dest_addr = gd->ram_size;
174 dest_addr -= GENERATED_GBL_DATA_SIZE;
176 gd->new_gd_addr = dest_addr;
178 /* GDT is below Global Data */
179 dest_addr -= X86_GDT_SIZE;
181 gd->gdt_addr = dest_addr;
183 /* Stack is below GDT */
184 gd->start_addr_sp = dest_addr;
186 /* U-Boot is below the stack */
187 dest_addr -= CONFIG_SYS_STACK_SIZE;
188 dest_addr -= (bss_end - text_start);
190 gd->relocaddr = dest_addr;
191 gd->reloc_off = (dest_addr - text_start);
196 /* Perform all steps necessary to get RAM initialised ready for relocation */
197 void board_init_f(ulong boot_flags)
199 gd->flags = boot_flags;
201 do_init_loop(init_sequence_f);
204 * SDRAM is now initialised, U-Boot has been copied into SDRAM,
205 * the BSS has been cleared etc. The final stack can now be setup
206 * in SDRAM. Code execution will continue (momentarily) in Flash,
207 * but with the stack in SDRAM and Global Data in temporary memory
210 board_init_f_r_trampoline(gd->start_addr_sp);
212 /* NOTREACHED - board_init_f_r_trampoline() does not return */
217 void board_init_f_r(void)
219 if (copy_gd_to_ram() != 0)
222 if (init_cache() != 0)
225 relocate_code(0, gd, 0);
227 /* NOTREACHED - relocate_code() does not return */
232 static int copy_gd_to_ram(void)
237 * Global data is still in temporary memory (the CPU cache).
238 * calculate_relocation_address() has set gd->new_gd_addr to
239 * where the global data lives in RAM but getting it there
240 * safely is a bit tricky due to the 'F-Segment Hack' that
241 * we need to use for x86
243 ram_gd = (gd_t *)gd->new_gd_addr;
244 memcpy((void *)ram_gd, gd, sizeof(gd_t));
247 * Reload the Global Descriptor Table so FS points to the
248 * in-RAM copy of Global Data (calculate_relocation_address()
249 * has already calculated the in-RAM location of the GDT)
251 ram_gd->gd_addr = (ulong)ram_gd;
252 init_gd(ram_gd, (u64 *)gd->gdt_addr);
257 void board_init_r(gd_t *id, ulong dest_addr)
259 gd->flags |= GD_FLG_RELOC;
261 /* compiler optimization barrier needed for GCC >= 3.4 */
262 __asm__ __volatile__("" : : : "memory");
264 do_init_loop(init_sequence_r);
266 /* main_loop() can return to retry autoboot, if so just run it again. */
270 /* NOTREACHED - no way out of command loop except booting */
275 puts("### ERROR ### Please RESET the board ###\n");