]>
git.ipfire.org Git - people/ms/u-boot.git/blob - lib_m68k/m68k_linux.c
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 #define CHUNKSZ (64 * 1024)
42 #ifdef CONFIG_SHOW_BOOT_PROGRESS
43 # include <status_led.h>
44 # define SHOW_BOOT_PROGRESS(arg) show_boot_progress(arg)
46 # define SHOW_BOOT_PROGRESS(arg)
49 extern image_header_t header
;
51 void do_bootm_linux(cmd_tbl_t
* cmdtp
, int flag
,
52 int argc
, char *argv
[],
53 ulong addr
, ulong
* len_ptr
, int verify
)
57 ulong initrd_start
, initrd_end
;
58 ulong cmd_start
, cmd_end
;
61 int initrd_copy_to_ram
= 1;
65 void (*kernel
) (bd_t
*, ulong
, ulong
, ulong
, ulong
);
66 image_header_t
*hdr
= &header
;
68 if ((s
= getenv("initrd_high")) != NULL
) {
69 /* a value of "no" or a similar string will act like 0,
70 * turning the "load high" feature off. This is intentional.
72 initrd_high
= simple_strtoul(s
, NULL
, 16);
73 if (initrd_high
== ~0)
74 initrd_copy_to_ram
= 0;
75 } else { /* not set, no restrictions to load high */
79 #ifdef CONFIG_LOGBUFFER
81 /* Prevent initrd from overwriting logbuffer */
82 if (initrd_high
< (kbd
->bi_memsize
- LOGBUFF_LEN
- LOGBUFF_OVERHEAD
))
83 initrd_high
= kbd
->bi_memsize
- LOGBUFF_LEN
- LOGBUFF_OVERHEAD
;
84 debug("## Logbuffer at 0x%08lX ", kbd
->bi_memsize
- LOGBUFF_LEN
);
88 * Booting a (Linux) kernel image
90 * Allocate space for command line and board info - the
91 * address should be as high as possible within the reach of
92 * the kernel (see CFG_BOOTMAPSZ settings), but in unused
93 * memory, which means far enough below the current stack
96 asm("movel %%a7, %%d0\n"
97 "movel %%d0, %0\n": "=d"(sp
): :"%d0");
99 debug("## Current stack ends at 0x%08lX ", sp
);
101 sp
-= 2048; /* just to be sure */
102 if (sp
> CFG_BOOTMAPSZ
)
106 debug("=> set upper limit to 0x%08lX\n", sp
);
108 cmdline
= (char *)((sp
- CFG_BARGSIZE
) & ~0xF);
109 kbd
= (bd_t
*) (((ulong
) cmdline
- sizeof(bd_t
)) & ~0xF);
111 if ((s
= getenv("bootargs")) == NULL
)
116 cmd_start
= (ulong
) & cmdline
[0];
117 cmd_end
= cmd_start
+ strlen(cmdline
);
122 printf("## cmdline at 0x%08lX ... 0x%08lX\n", cmd_start
, cmd_end
);
124 do_bdinfo(NULL
, 0, 0, NULL
);
127 if ((s
= getenv("clocks_in_mhz")) != NULL
) {
128 /* convert all clock information to MHz */
129 kbd
->bi_intfreq
/= 1000000L;
130 kbd
->bi_busfreq
/= 1000000L;
134 (void (*)(bd_t
*, ulong
, ulong
, ulong
, ulong
))ntohl(hdr
->ih_ep
);
137 * Check if there is an initrd image
141 debug("Not skipping initrd\n");
142 SHOW_BOOT_PROGRESS(9);
144 addr
= simple_strtoul(argv
[2], NULL
, 16);
146 printf("## Loading RAMDisk Image at %08lx ...\n", addr
);
148 /* Copy header so we can blank CRC field for re-calculation */
149 memmove(&header
, (char *)addr
, sizeof(image_header_t
));
151 if (ntohl(hdr
->ih_magic
) != IH_MAGIC
) {
152 puts("Bad Magic Number\n");
153 SHOW_BOOT_PROGRESS(-10);
154 do_reset(cmdtp
, flag
, argc
, argv
);
157 data
= (ulong
) & header
;
158 len
= sizeof(image_header_t
);
160 checksum
= ntohl(hdr
->ih_hcrc
);
163 if (crc32(0, (uchar
*) data
, len
) != checksum
) {
164 puts("Bad Header Checksum\n");
165 SHOW_BOOT_PROGRESS(-11);
166 do_reset(cmdtp
, flag
, argc
, argv
);
169 SHOW_BOOT_PROGRESS(10);
171 print_image_hdr(hdr
);
173 data
= addr
+ sizeof(image_header_t
);
174 len
= ntohl(hdr
->ih_size
);
178 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
179 ulong cdata
= data
, edata
= cdata
+ len
;
180 #endif /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
182 puts(" Verifying Checksum ... ");
184 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
186 while (cdata
< edata
) {
187 ulong chunk
= edata
- cdata
;
191 csum
= crc32(csum
, (uchar
*) cdata
, chunk
);
196 #else /* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
197 csum
= crc32(0, (uchar
*) data
, len
);
198 #endif /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
200 if (csum
!= ntohl(hdr
->ih_dcrc
)) {
201 puts("Bad Data CRC\n");
202 SHOW_BOOT_PROGRESS(-12);
203 do_reset(cmdtp
, flag
, argc
, argv
);
208 SHOW_BOOT_PROGRESS(11);
210 if ((hdr
->ih_os
!= IH_OS_LINUX
) ||
211 (hdr
->ih_arch
!= IH_CPU_M68K
) ||
212 (hdr
->ih_type
!= IH_TYPE_RAMDISK
)) {
213 puts("No Linux ColdFire Ramdisk Image\n");
214 SHOW_BOOT_PROGRESS(-13);
215 do_reset(cmdtp
, flag
, argc
, argv
);
219 * Now check if we have a multifile image
221 } else if ((hdr
->ih_type
== IH_TYPE_MULTI
) && (len_ptr
[1])) {
222 u_long tail
= ntohl(len_ptr
[0]) % 4;
225 SHOW_BOOT_PROGRESS(13);
227 /* skip kernel length and terminator */
228 data
= (ulong
) (&len_ptr
[2]);
229 /* skip any additional image length fields */
230 for (i
= 1; len_ptr
[i
]; ++i
)
232 /* add kernel length, and align */
233 data
+= ntohl(len_ptr
[0]);
238 len
= ntohl(len_ptr
[1]);
244 SHOW_BOOT_PROGRESS(14);
250 debug("No initrd\n");
254 if (!initrd_copy_to_ram
) { /* zero-copy ramdisk support */
256 initrd_end
= initrd_start
+ len
;
258 initrd_start
= (ulong
) kbd
- len
;
259 initrd_start
&= ~(4096 - 1); /* align on page */
265 * the inital ramdisk does not need to be within
266 * CFG_BOOTMAPSZ as it is not accessed until after
267 * the mm system is initialised.
269 * do the stack bottom calculation again and see if
270 * the initrd will fit just below the monitor stack
271 * bottom without overwriting the area allocated
272 * above for command line args and board info.
274 asm("movel %%a7, %%d0\n"
275 "movel %%d0, %0\n": "=d"(nsp
): :"%d0");
277 nsp
-= 2048; /* just to be sure */
280 if (nsp
> initrd_high
) /* limit as specified */
284 nsp
&= ~(4096 - 1); /* align on page */
290 SHOW_BOOT_PROGRESS(12);
293 ("## initrd at 0x%08lX ... 0x%08lX (len=%ld=0x%lX)\n",
294 data
, data
+ len
- 1, len
, len
);
296 initrd_end
= initrd_start
+ len
;
297 printf(" Loading Ramdisk to %08lx, end %08lx ... ",
298 initrd_start
, initrd_end
);
299 #if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
302 void *to
= (void *)initrd_start
;
303 void *from
= (void *)data
;
307 (l
> CHUNKSZ
) ? CHUNKSZ
: l
;
309 memmove(to
, from
, tail
);
315 #else /* !(CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG) */
316 memmove((void *)initrd_start
, (void *)data
, len
);
317 #endif /* CONFIG_HW_WATCHDOG || CONFIG_WATCHDOG */
325 debug("## Transferring control to Linux (at address %08lx) ...\n",
328 SHOW_BOOT_PROGRESS(15);
331 * Linux Kernel Parameters (passing board info data):
332 * r3: ptr to board info data
333 * r4: initrd_start or 0 if no initrd
334 * r5: initrd_end - unused if r4 is 0
335 * r6: Start of command line string
336 * r7: End of command line string
338 (*kernel
) (kbd
, initrd_start
, initrd_end
, cmd_start
, cmd_end
);
339 /* does not return */