2 * (C) Copyright 2008 Semihalf
4 * (C) Copyright 2000-2006
5 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
34 #include <environment.h>
35 #include <asm/byteorder.h>
37 #if defined(CONFIG_OF_LIBFDT)
40 #include <fdt_support.h>
44 #ifdef CFG_INIT_RAM_LOCK
45 #include <asm/cache.h>
48 DECLARE_GLOBAL_DATA_PTR;
50 extern ulong get_effective_memsize(void);
51 static ulong get_sp (void);
52 static void set_clocks_in_mhz (bd_t *kbd);
54 #ifndef CFG_LINUX_LOWMEM_MAX_SIZE
55 #define CFG_LINUX_LOWMEM_MAX_SIZE (768*1024*1024)
58 __attribute__((noinline))
59 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
63 ulong initrd_start, initrd_end;
66 phys_size_t bootm_size;
68 ulong cmd_start, cmd_end, bootmap_base;
70 void (*kernel)(bd_t *, ulong r4, ulong r5, ulong r6,
71 ulong r7, ulong r8, ulong r9);
73 ulong of_size = images->ft_len;
74 struct lmb *lmb = &images->lmb;
76 #if defined(CONFIG_OF_LIBFDT)
77 char *of_flat_tree = images->ft_addr;
80 kernel = (void (*)(bd_t *, ulong, ulong, ulong,
81 ulong, ulong, ulong))images->ep;
83 bootmap_base = getenv_bootm_low();
84 bootm_size = getenv_bootm_size();
87 if (((u64)bootmap_base + bootm_size) >
88 (CFG_SDRAM_BASE + (u64)gd->ram_size))
89 puts("WARNING: bootm_low + bootm_size exceed total memory\n");
90 if ((bootmap_base + bootm_size) > get_effective_memsize())
91 puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
94 size = min(bootm_size, get_effective_memsize());
95 size = min(size, CFG_LINUX_LOWMEM_MAX_SIZE);
97 if (size < bootm_size) {
98 ulong base = bootmap_base + size;
99 printf("WARNING: adjusting available memory to %lx\n", size);
100 lmb_reserve(lmb, base, bootm_size - size);
104 * Booting a (Linux) kernel image
106 * Allocate space for command line and board info - the
107 * address should be as high as possible within the reach of
108 * the kernel (see CFG_BOOTMAPSZ settings), but in unused
109 * memory, which means far enough below the current stack
113 debug ("## Current stack ends at 0x%08lx\n", sp);
115 /* adjust sp by 1K to be safe */
117 lmb_reserve(lmb, sp, (CFG_SDRAM_BASE + get_effective_memsize() - sp));
120 /* allocate space and init command line */
121 ret = boot_get_cmdline (lmb, &cmd_start, &cmd_end, bootmap_base);
123 puts("ERROR with allocation of cmdline\n");
127 /* allocate space for kernel copy of board info */
128 ret = boot_get_kbd (lmb, &kbd, bootmap_base);
130 puts("ERROR with allocation of kernel bd\n");
133 set_clocks_in_mhz(kbd);
136 rd_len = images->rd_end - images->rd_start;
138 #if defined(CONFIG_OF_LIBFDT)
139 ret = boot_relocate_fdt(lmb, bootmap_base, &of_flat_tree, &of_size);
144 * Add the chosen node if it doesn't exist, add the env and bd_t
145 * if the user wants it (the logic is in the subroutines).
148 /* pass in dummy initrd info, we'll fix up later */
149 if (fdt_chosen(of_flat_tree, images->rd_start, images->rd_end, 0) < 0) {
151 puts ("/chosen node create failed");
152 puts (" - must RESET the board to recover.\n");
155 #ifdef CONFIG_OF_BOARD_SETUP
156 /* Call the board-specific fixup routine */
157 ft_board_setup(of_flat_tree, gd->bd);
161 /* Fixup the fdt memreserve now that we know how big it is */
163 /* Delete the old LMB reservation */
164 lmb_free(lmb, (phys_addr_t)(u32)of_flat_tree,
165 (phys_size_t)fdt_totalsize(of_flat_tree));
167 ret = fdt_resize(of_flat_tree);
172 /* Create a new LMB reservation */
173 lmb_reserve(lmb, (ulong)of_flat_tree, of_size);
175 #endif /* CONFIG_OF_LIBFDT */
177 ret = boot_ramdisk_high (lmb, images->rd_start, rd_len, &initrd_start, &initrd_end);
181 #if defined(CONFIG_OF_LIBFDT)
182 /* fixup the initrd now that we know where it should be */
183 if ((of_flat_tree) && (initrd_start && initrd_end))
184 fdt_initrd(of_flat_tree, initrd_start, initrd_end, 1);
186 debug ("## Transferring control to Linux (at address %08lx) ...\n",
189 show_boot_progress (15);
191 #if defined(CFG_INIT_RAM_LOCK) && !defined(CONFIG_E500)
192 unlock_ram_in_cache();
195 #if defined(CONFIG_OF_LIBFDT)
196 if (of_flat_tree) { /* device tree; boot new style */
198 * Linux Kernel Parameters (passing device tree):
199 * r3: pointer to the fdt
203 * r7: size of IMA in bytes
207 #if defined(CONFIG_85xx) || defined(CONFIG_440)
208 #define EPAPR_MAGIC (0x45504150)
210 #define EPAPR_MAGIC (0x65504150)
213 debug (" Booting using OF flat tree...\n");
214 (*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
215 CFG_BOOTMAPSZ, 0, 0);
216 /* does not return */
221 * Linux Kernel Parameters (passing board info data):
222 * r3: ptr to board info data
223 * r4: initrd_start or 0 if no initrd
224 * r5: initrd_end - unused if r4 is 0
225 * r6: Start of command line string
226 * r7: End of command line string
230 debug (" Booting using board info...\n");
231 (*kernel) (kbd, initrd_start, initrd_end,
232 cmd_start, cmd_end, 0, 0);
233 /* does not return */
241 static ulong get_sp (void)
245 asm( "mr %0,1": "=r"(sp) : );
249 static void set_clocks_in_mhz (bd_t *kbd)
253 if ((s = getenv ("clocks_in_mhz")) != NULL) {
254 /* convert all clock information to MHz */
255 kbd->bi_intfreq /= 1000000L;
256 kbd->bi_busfreq /= 1000000L;
257 #if defined(CONFIG_MPC8220)
258 kbd->bi_inpfreq /= 1000000L;
259 kbd->bi_pcifreq /= 1000000L;
260 kbd->bi_pevfreq /= 1000000L;
261 kbd->bi_flbfreq /= 1000000L;
262 kbd->bi_vcofreq /= 1000000L;
264 #if defined(CONFIG_CPM2)
265 kbd->bi_cpmfreq /= 1000000L;
266 kbd->bi_brgfreq /= 1000000L;
267 kbd->bi_sccfreq /= 1000000L;
268 kbd->bi_vco /= 1000000L;
270 #if defined(CONFIG_MPC5xxx)
271 kbd->bi_ipbfreq /= 1000000L;
272 kbd->bi_pcifreq /= 1000000L;
273 #endif /* CONFIG_MPC5xxx */