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git.ipfire.org Git - people/ms/u-boot.git/blob - lib_m68k/bootm.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>
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
;
63 void (*kernel
) (bd_t
*, ulong
, ulong
, ulong
, ulong
);
64 struct lmb
*lmb
= images
->lmb
;
66 bootmap_base
= getenv_bootm_low();
69 * Booting a (Linux) kernel image
71 * Allocate space for command line and board info - the
72 * address should be as high as possible within the reach of
73 * the kernel (see CFG_BOOTMAPSZ settings), but in unused
74 * memory, which means far enough below the current stack
78 debug ("## Current stack ends at 0x%08lx ", sp
);
80 /* adjust sp by 1K to be safe */
82 lmb_reserve(lmb
, sp
, (CFG_SDRAM_BASE
+ gd
->ram_size
- sp
));
84 /* allocate space and init command line */
85 ret
= get_boot_cmdline (lmb
, &cmd_start
, &cmd_end
, bootmap_base
);
87 puts("ERROR with allocation of cmdline\n");
91 /* allocate space for kernel copy of board info */
92 ret
= get_boot_kbd (lmb
, &kbd
, bootmap_base
);
94 puts("ERROR with allocation of kernel bd\n");
97 set_clocks_in_mhz(kbd
);
99 /* find kernel entry point */
100 if (images
->legacy_hdr_valid
) {
101 ep
= image_get_ep (images
->legacy_hdr_os
);
102 #if defined(CONFIG_FIT)
103 } else if (images
->fit_uname_os
) {
104 fit_unsupported_reset ("M68K linux bootm");
105 do_reset (cmdtp
, flag
, argc
, argv
);
108 puts ("Could not find kernel entry point!\n");
109 do_reset (cmdtp
, flag
, argc
, argv
);
111 kernel
= (void (*)(bd_t
*, ulong
, ulong
, ulong
, ulong
))ep
;
114 ret
= get_ramdisk (cmdtp
, flag
, argc
, argv
, images
,
115 IH_ARCH_M68K
, &rd_data_start
, &rd_data_end
);
120 rd_len
= rd_data_end
- rd_data_start
;
121 ret
= ramdisk_high (lmb
, rd_data_start
, rd_len
, &initrd_start
, &initrd_end
);
125 debug("## Transferring control to Linux (at address %08lx) ...\n",
128 show_boot_progress (15);
131 * Linux Kernel Parameters (passing board info data):
132 * r3: ptr to board info data
133 * r4: initrd_start or 0 if no initrd
134 * r5: initrd_end - unused if r4 is 0
135 * r6: Start of command line string
136 * r7: End of command line string
138 (*kernel
) (kbd
, initrd_start
, initrd_end
, cmd_start
, cmd_end
);
139 /* does not return */
143 do_reset (cmdtp
, flag
, argc
, argv
);
147 static ulong
get_sp (void)
151 asm("movel %%a7, %%d0\n"
152 "movel %%d0, %0\n": "=d"(sp
): :"%d0");
157 static void set_clocks_in_mhz (bd_t
*kbd
)
161 if ((s
= getenv("clocks_in_mhz")) != NULL
) {
162 /* convert all clock information to MHz */
163 kbd
->bi_intfreq
/= 1000000L;
164 kbd
->bi_busfreq
/= 1000000L;