1 /*
2 * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
3 * Scott McNutt <smcnutt@psyent.com>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8 #include <common.h>
9
10 #define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */
11
do_bootm_linux(int flag,int argc,char * const argv[],bootm_headers_t * images)12 int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
13 {
14 void (*kernel)(int, int, int, char *) = (void *)images->ep;
15 char *commandline = env_get("bootargs");
16 ulong initrd_start = images->rd_start;
17 ulong initrd_end = images->rd_end;
18 char *of_flat_tree = NULL;
19 #if defined(CONFIG_OF_LIBFDT)
20 /* did generic code already find a device tree? */
21 if (images->ft_len)
22 of_flat_tree = images->ft_addr;
23 #endif
24 if (!of_flat_tree && argc > 1)
25 of_flat_tree = (char *)simple_strtoul(argv[1], NULL, 16);
26 if (of_flat_tree)
27 initrd_end = (ulong)of_flat_tree;
28
29 /*
30 * allow the PREP bootm subcommand, it is required for bootm to work
31 */
32 if (flag & BOOTM_STATE_OS_PREP)
33 return 0;
34
35 if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
36 return 1;
37
38 /* flushes data and instruction caches before calling the kernel */
39 disable_interrupts();
40 flush_dcache_all();
41
42 debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline);
43 debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end);
44 /* kernel parameters passing
45 * r4 : NIOS magic
46 * r5 : initrd start
47 * r6 : initrd end or fdt
48 * r7 : kernel command line
49 * fdt is passed to kernel via r6, the same as initrd_end. fdt will be
50 * verified with fdt magic. when both initrd and fdt are used at the
51 * same time, fdt must follow immediately after initrd.
52 */
53 kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline);
54 /* does not return */
55
56 return 1;
57 }
58