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>
33 DECLARE_GLOBAL_DATA_PTR;
37 #define LINUX_MAX_ENVS 256
38 #define LINUX_MAX_ARGS 256
40 #ifdef CONFIG_SHOW_BOOT_PROGRESS
41 # include <status_led.h>
42 # define SHOW_BOOT_PROGRESS(arg) show_boot_progress(arg)
44 # define SHOW_BOOT_PROGRESS(arg)
47 void do_bootm_linux(cmd_tbl_t * cmdtp, int flag,
48 int argc, char *argv[],
49 image_header_t *hdr, int verify)
53 ulong rd_data_start, rd_data_end, rd_len;
55 ulong initrd_start, initrd_end;
56 int initrd_copy_to_ram = 1;
58 ulong cmd_start, cmd_end;
62 void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
64 if ((s = getenv("initrd_high")) != NULL) {
65 /* a value of "no" or a similar string will act like 0,
66 * turning the "load high" feature off. This is intentional.
68 initrd_high = simple_strtoul(s, NULL, 16);
69 if (initrd_high == ~0)
70 initrd_copy_to_ram = 0;
71 } else { /* not set, no restrictions to load high */
75 #ifdef CONFIG_LOGBUFFER
77 /* Prevent initrd from overwriting logbuffer */
78 if (initrd_high < (kbd->bi_memsize - LOGBUFF_LEN - LOGBUFF_OVERHEAD))
79 initrd_high = kbd->bi_memsize - LOGBUFF_LEN - LOGBUFF_OVERHEAD;
80 debug("## Logbuffer at 0x%08lX ", kbd->bi_memsize - LOGBUFF_LEN);
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 CFG_BOOTMAPSZ settings), but in unused
89 * memory, which means far enough below the current stack
92 asm("movel %%a7, %%d0\n"
93 "movel %%d0, %0\n": "=d"(sp): :"%d0");
95 debug("## Current stack ends at 0x%08lX ", sp);
97 sp -= 2048; /* just to be sure */
98 if (sp > CFG_BOOTMAPSZ)
102 debug("=> set upper limit to 0x%08lX\n", sp);
104 cmdline = (char *)((sp - CFG_BARGSIZE) & ~0xF);
105 kbd = (bd_t *) (((ulong) cmdline - sizeof(bd_t)) & ~0xF);
107 if ((s = getenv("bootargs")) == NULL)
112 cmd_start = (ulong) & cmdline[0];
113 cmd_end = cmd_start + strlen(cmdline);
118 printf("## cmdline at 0x%08lX ... 0x%08lX\n", cmd_start, cmd_end);
120 do_bdinfo(NULL, 0, 0, NULL);
123 if ((s = getenv("clocks_in_mhz")) != NULL) {
124 /* convert all clock information to MHz */
125 kbd->bi_intfreq /= 1000000L;
126 kbd->bi_busfreq /= 1000000L;
130 (void (*)(bd_t *, ulong, ulong, ulong, ulong))image_get_ep (hdr);
132 get_ramdisk (cmdtp, flag, argc, argv, hdr, verify,
133 IH_ARCH_M68K, &rd_data_start, &rd_data_end);
134 rd_len = rd_data_end - rd_data_start;
137 if (!initrd_copy_to_ram) { /* zero-copy ramdisk support */
138 initrd_start = rd_data_start;
139 initrd_end = rd_data_end;
141 initrd_start = (ulong) kbd - rd_len;
142 initrd_start &= ~(4096 - 1); /* align on page */
148 * the inital ramdisk does not need to be within
149 * CFG_BOOTMAPSZ as it is not accessed until after
150 * the mm system is initialised.
152 * do the stack bottom calculation again and see if
153 * the initrd will fit just below the monitor stack
154 * bottom without overwriting the area allocated
155 * above for command line args and board info.
157 asm("movel %%a7, %%d0\n"
158 "movel %%d0, %0\n": "=d"(nsp): :"%d0");
160 nsp -= 2048; /* just to be sure */
163 if (nsp > initrd_high) /* limit as specified */
167 nsp &= ~(4096 - 1); /* align on page */
173 SHOW_BOOT_PROGRESS(12);
176 ("## initrd at 0x%08lX ... 0x%08lX (len=%ld=0x%lX)\n",
177 rd_data_start, rd_data_end - 1, rd_len, rd_len);
179 initrd_end = initrd_start + rd_len;
180 printf(" Loading Ramdisk to %08lx, end %08lx ... ",
181 initrd_start, initrd_end);
183 memmove_wd((void *)initrd_start,
184 (void *)rd_data_start, rd_len, CHUNKSZ);
193 debug("## Transferring control to Linux (at address %08lx) ...\n",
196 SHOW_BOOT_PROGRESS(15);
199 * Linux Kernel Parameters (passing board info data):
200 * r3: ptr to board info data
201 * r4: initrd_start or 0 if no initrd
202 * r5: initrd_end - unused if r4 is 0
203 * r6: Start of command line string
204 * r7: End of command line string
206 (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
207 /* does not return */