xref: /openbmc/u-boot/arch/microblaze/lib/bootm.c (revision e8f80a5a)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2007 Michal Simek
4  * (C) Copyright 2004 Atmark Techno, Inc.
5  *
6  * Michal  SIMEK <monstr@monstr.eu>
7  * Yasushi SHOJI <yashi@atmark-techno.com>
8  */
9 
10 #include <common.h>
11 #include <command.h>
12 #include <fdt_support.h>
13 #include <image.h>
14 #include <u-boot/zlib.h>
15 #include <asm/byteorder.h>
16 
do_bootm_linux(int flag,int argc,char * const argv[],bootm_headers_t * images)17 int do_bootm_linux(int flag, int argc, char * const argv[],
18 		   bootm_headers_t *images)
19 {
20 	/* First parameter is mapped to $r5 for kernel boot args */
21 	void	(*thekernel) (char *, ulong, ulong);
22 	char	*commandline = env_get("bootargs");
23 	ulong	rd_data_start, rd_data_end;
24 
25 	/*
26 	 * allow the PREP bootm subcommand, it is required for bootm to work
27 	 */
28 	if (flag & BOOTM_STATE_OS_PREP)
29 		return 0;
30 
31 	if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
32 		return 1;
33 
34 	int	ret;
35 
36 	char	*of_flat_tree = NULL;
37 #if defined(CONFIG_OF_LIBFDT)
38 	/* did generic code already find a device tree? */
39 	if (images->ft_len)
40 		of_flat_tree = images->ft_addr;
41 #endif
42 
43 	thekernel = (void (*)(char *, ulong, ulong))images->ep;
44 
45 	/* find ramdisk */
46 	ret = boot_get_ramdisk(argc, argv, images, IH_ARCH_MICROBLAZE,
47 			&rd_data_start, &rd_data_end);
48 	if (ret)
49 		return 1;
50 
51 	bootstage_mark(BOOTSTAGE_ID_RUN_OS);
52 
53 	if (!of_flat_tree && argc > 1)
54 		of_flat_tree = (char *)simple_strtoul(argv[1], NULL, 16);
55 
56 	/* fixup the initrd now that we know where it should be */
57 	if (images->rd_start && images->rd_end && of_flat_tree) {
58 		ret = fdt_initrd(of_flat_tree, images->rd_start,
59 				 images->rd_end);
60 		if (ret)
61 			return 1;
62 	}
63 
64 #ifdef DEBUG
65 	printf("## Transferring control to Linux (at address 0x%08lx) ",
66 	       (ulong)thekernel);
67 	printf("ramdisk 0x%08lx, FDT 0x%08lx...\n",
68 	       rd_data_start, (ulong) of_flat_tree);
69 #endif
70 
71 #ifdef XILINX_USE_DCACHE
72 	flush_cache(0, XILINX_DCACHE_BYTE_SIZE);
73 #endif
74 	/*
75 	 * Linux Kernel Parameters (passing device tree):
76 	 * r5: pointer to command line
77 	 * r6: pointer to ramdisk
78 	 * r7: pointer to the fdt, followed by the board info data
79 	 */
80 	thekernel(commandline, rd_data_start, (ulong)of_flat_tree);
81 	/* does not return */
82 
83 	return 1;
84 }
85