3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 #include <environment.h>
31 #include <asm/byteorder.h>
32 #ifdef CONFIG_SHOW_BOOT_PROGRESS
33 # include <status_led.h>
36 DECLARE_GLOBAL_DATA_PTR;
40 #define LINUX_MAX_ENVS 256
41 #define LINUX_MAX_ARGS 256
43 static ulong get_sp (void);
44 static void set_clocks_in_mhz (bd_t *kbd);
45 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
47 void do_bootm_linux(cmd_tbl_t * cmdtp, int flag,
48 int argc, char *argv[],
49 bootm_headers_t *images)
53 ulong rd_data_start, rd_data_end, rd_len;
54 ulong initrd_start, initrd_end;
57 ulong cmd_start, cmd_end;
60 void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
61 struct lmb *lmb = images->lmb;
63 bootmap_base = getenv_bootm_low();
66 * Booting a (Linux) kernel image
68 * Allocate space for command line and board info - the
69 * address should be as high as possible within the reach of
70 * the kernel (see CFG_BOOTMAPSZ settings), but in unused
71 * memory, which means far enough below the current stack
75 debug ("## Current stack ends at 0x%08lx ", sp);
77 /* adjust sp by 1K to be safe */
79 lmb_reserve(lmb, sp, (CFG_SDRAM_BASE + gd->ram_size - sp));
81 /* allocate space and init command line */
82 ret = boot_get_cmdline (lmb, &cmd_start, &cmd_end, bootmap_base);
84 puts("ERROR with allocation of cmdline\n");
88 /* allocate space for kernel copy of board info */
89 ret = boot_get_kbd (lmb, &kbd, bootmap_base);
91 puts("ERROR with allocation of kernel bd\n");
94 set_clocks_in_mhz(kbd);
96 kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))images->ep;
99 ret = boot_get_ramdisk (argc, argv, images, IH_ARCH_M68K,
100 &rd_data_start, &rd_data_end);
104 rd_len = rd_data_end - rd_data_start;
105 ret = boot_ramdisk_high (lmb, rd_data_start, rd_len,
106 &initrd_start, &initrd_end);
110 debug("## Transferring control to Linux (at address %08lx) ...\n",
113 show_boot_progress (15);
116 * Linux Kernel Parameters (passing board info data):
117 * r3: ptr to board info data
118 * r4: initrd_start or 0 if no initrd
119 * r5: initrd_end - unused if r4 is 0
120 * r6: Start of command line string
121 * r7: End of command line string
123 (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
124 /* does not return */
128 do_reset (cmdtp, flag, argc, argv);
132 static ulong get_sp (void)
136 asm("movel %%a7, %%d0\n"
137 "movel %%d0, %0\n": "=d"(sp): :"%d0");
142 static void set_clocks_in_mhz (bd_t *kbd)
146 if ((s = getenv("clocks_in_mhz")) != NULL) {
147 /* convert all clock information to MHz */
148 kbd->bi_intfreq /= 1000000L;
149 kbd->bi_busfreq /= 1000000L;