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 CONFIG_SYS_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 CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE
55 #define CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE (768*1024*1024)
58 void arch_lmb_reserve(struct lmb *lmb)
60 phys_size_t bootm_size;
61 ulong size, sp, bootmap_base;
63 bootmap_base = getenv_bootm_low();
64 bootm_size = getenv_bootm_size();
67 if (((u64)bootmap_base + bootm_size) >
68 (CONFIG_SYS_SDRAM_BASE + (u64)gd->ram_size))
69 puts("WARNING: bootm_low + bootm_size exceed total memory\n");
70 if ((bootmap_base + bootm_size) > get_effective_memsize())
71 puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
74 size = min(bootm_size, get_effective_memsize());
75 size = min(size, CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE);
77 if (size < bootm_size) {
78 ulong base = bootmap_base + size;
79 printf("WARNING: adjusting available memory to %lx\n", size);
80 lmb_reserve(lmb, base, bootm_size - size);
84 * Booting a (Linux) kernel image
86 * Allocate space for command line and board info - the
87 * address should be as high as possible within the reach of
88 * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
89 * memory, which means far enough below the current stack
93 debug ("## Current stack ends at 0x%08lx\n", sp);
95 /* adjust sp by 1K to be safe */
97 lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - sp));
102 __attribute__((noinline))
103 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
105 ulong initrd_start, initrd_end;
108 ulong cmd_start, cmd_end, bootmap_base;
110 void (*kernel)(bd_t *, ulong r4, ulong r5, ulong r6,
111 ulong r7, ulong r8, ulong r9);
113 ulong of_size = images->ft_len;
114 struct lmb *lmb = &images->lmb;
116 #if defined(CONFIG_OF_LIBFDT)
117 char *of_flat_tree = images->ft_addr;
120 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
123 kernel = (void (*)(bd_t *, ulong, ulong, ulong,
124 ulong, ulong, ulong))images->ep;
126 bootmap_base = getenv_bootm_low();
129 /* allocate space and init command line */
130 ret = boot_get_cmdline (lmb, &cmd_start, &cmd_end, bootmap_base);
132 puts("ERROR with allocation of cmdline\n");
136 /* allocate space for kernel copy of board info */
137 ret = boot_get_kbd (lmb, &kbd, bootmap_base);
139 puts("ERROR with allocation of kernel bd\n");
142 set_clocks_in_mhz(kbd);
145 rd_len = images->rd_end - images->rd_start;
147 #if defined(CONFIG_OF_LIBFDT)
148 ret = boot_relocate_fdt(lmb, bootmap_base, &of_flat_tree, &of_size);
153 * Add the chosen node if it doesn't exist, add the env and bd_t
154 * if the user wants it (the logic is in the subroutines).
157 if (fdt_chosen(of_flat_tree, 1) < 0) {
159 puts ("/chosen node create failed");
160 puts (" - must RESET the board to recover.\n");
163 #ifdef CONFIG_OF_BOARD_SETUP
164 /* Call the board-specific fixup routine */
165 ft_board_setup(of_flat_tree, gd->bd);
169 /* Fixup the fdt memreserve now that we know how big it is */
171 /* Delete the old LMB reservation */
172 lmb_free(lmb, (phys_addr_t)(u32)of_flat_tree,
173 (phys_size_t)fdt_totalsize(of_flat_tree));
175 ret = fdt_resize(of_flat_tree);
180 if ((of_flat_tree) && (initrd_start && initrd_end))
181 of_size += FDT_RAMDISK_OVERHEAD;
182 /* Create a new LMB reservation */
183 lmb_reserve(lmb, (ulong)of_flat_tree, of_size);
185 #endif /* CONFIG_OF_LIBFDT */
187 ret = boot_ramdisk_high (lmb, images->rd_start, rd_len, &initrd_start, &initrd_end);
191 #if defined(CONFIG_OF_LIBFDT)
192 /* fixup the initrd now that we know where it should be */
193 if ((of_flat_tree) && (initrd_start && initrd_end))
194 fdt_initrd(of_flat_tree, initrd_start, initrd_end, 1);
196 debug ("## Transferring control to Linux (at address %08lx) ...\n",
199 show_boot_progress (15);
201 #if defined(CONFIG_SYS_INIT_RAM_LOCK) && !defined(CONFIG_E500)
202 unlock_ram_in_cache();
205 #if defined(CONFIG_OF_LIBFDT)
206 if (of_flat_tree) { /* device tree; boot new style */
208 * Linux Kernel Parameters (passing device tree):
209 * r3: pointer to the fdt
213 * r7: size of IMA in bytes
217 #if defined(CONFIG_85xx) || defined(CONFIG_440)
218 #define EPAPR_MAGIC (0x45504150)
220 #define EPAPR_MAGIC (0x65504150)
223 debug (" Booting using OF flat tree...\n");
224 (*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
225 CONFIG_SYS_BOOTMAPSZ, 0, 0);
226 /* does not return */
231 * Linux Kernel Parameters (passing board info data):
232 * r3: ptr to board info data
233 * r4: initrd_start or 0 if no initrd
234 * r5: initrd_end - unused if r4 is 0
235 * r6: Start of command line string
236 * r7: End of command line string
240 debug (" Booting using board info...\n");
241 (*kernel) (kbd, initrd_start, initrd_end,
242 cmd_start, cmd_end, 0, 0);
243 /* does not return */
251 static ulong get_sp (void)
255 asm( "mr %0,1": "=r"(sp) : );
259 static void set_clocks_in_mhz (bd_t *kbd)
263 if ((s = getenv ("clocks_in_mhz")) != NULL) {
264 /* convert all clock information to MHz */
265 kbd->bi_intfreq /= 1000000L;
266 kbd->bi_busfreq /= 1000000L;
267 #if defined(CONFIG_MPC8220)
268 kbd->bi_inpfreq /= 1000000L;
269 kbd->bi_pcifreq /= 1000000L;
270 kbd->bi_pevfreq /= 1000000L;
271 kbd->bi_flbfreq /= 1000000L;
272 kbd->bi_vcofreq /= 1000000L;
274 #if defined(CONFIG_CPM2)
275 kbd->bi_cpmfreq /= 1000000L;
276 kbd->bi_brgfreq /= 1000000L;
277 kbd->bi_sccfreq /= 1000000L;
278 kbd->bi_vco /= 1000000L;
280 #if defined(CONFIG_MPC5xxx)
281 kbd->bi_ipbfreq /= 1000000L;
282 kbd->bi_pcifreq /= 1000000L;
283 #endif /* CONFIG_MPC5xxx */