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;
38 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
42 #define LINUX_MAX_ENVS 256
43 #define LINUX_MAX_ARGS 256
45 static ulong get_sp (void);
46 static void set_clocks_in_mhz (bd_t *kbd);
47 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
49 void do_bootm_linux(cmd_tbl_t * cmdtp, int flag,
50 int argc, char *argv[],
51 bootm_headers_t *images)
55 ulong rd_data_start, rd_data_end, rd_len;
56 ulong initrd_start, initrd_end;
59 ulong cmd_start, cmd_end;
60 ulong bootmap_base = 0;
63 void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
64 struct lmb *lmb = images->lmb;
67 * Booting a (Linux) kernel image
69 * Allocate space for command line and board info - the
70 * address should be as high as possible within the reach of
71 * the kernel (see CFG_BOOTMAPSZ settings), but in unused
72 * memory, which means far enough below the current stack
76 debug ("## Current stack ends at 0x%08lx ", sp);
78 /* adjust sp by 1K to be safe */
80 lmb_reserve(lmb, sp, (CFG_SDRAM_BASE + gd->ram_size - sp));
82 /* allocate space and init command line */
83 ret = get_boot_cmdline (lmb, &cmd_start, &cmd_end, bootmap_base);
85 puts("ERROR with allocation of cmdline\n");
89 /* allocate space for kernel copy of board info */
90 ret = get_boot_kbd (lmb, &kbd, bootmap_base);
92 puts("ERROR with allocation of kernel bd\n");
95 set_clocks_in_mhz(kbd);
97 /* find kernel entry point */
98 if (images->legacy_hdr_valid) {
99 ep = image_get_ep (images->legacy_hdr_os);
100 #if defined(CONFIG_FIT)
101 } else if (images->fit_uname_os) {
102 fit_unsupported_reset ("M68K linux bootm");
103 do_reset (cmdtp, flag, argc, argv);
106 puts ("Could not find kernel entry point!\n");
107 do_reset (cmdtp, flag, argc, argv);
109 kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))ep;
112 ret = get_ramdisk (cmdtp, flag, argc, argv, images,
113 IH_ARCH_M68K, &rd_data_start, &rd_data_end);
118 rd_len = rd_data_end - rd_data_start;
119 ret = ramdisk_high (lmb, rd_data_start, rd_len, &initrd_start, &initrd_end);
123 debug("## Transferring control to Linux (at address %08lx) ...\n",
126 show_boot_progress (15);
129 * Linux Kernel Parameters (passing board info data):
130 * r3: ptr to board info data
131 * r4: initrd_start or 0 if no initrd
132 * r5: initrd_end - unused if r4 is 0
133 * r6: Start of command line string
134 * r7: End of command line string
136 (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
137 /* does not return */
141 do_reset (cmdtp, flag, argc, argv);
145 static ulong get_sp (void)
149 asm("movel %%a7, %%d0\n"
150 "movel %%d0, %0\n": "=d"(sp): :"%d0");
155 static void set_clocks_in_mhz (bd_t *kbd)
159 if ((s = getenv("clocks_in_mhz")) != NULL) {
160 /* convert all clock information to MHz */
161 kbd->bi_intfreq /= 1000000L;
162 kbd->bi_busfreq /= 1000000L;