2 * Copyright (c) 2001 William L. Pitts
5 * Redistribution and use in source and binary forms are freely
6 * permitted provided that the above copyright notice and this
7 * paragraph and the following disclaimer are duplicated in all
10 * This software is provided "AS IS" and without any express or
11 * implied warranties, including, without limitation, the implied
12 * warranties of merchantability and fitness for a particular
18 #include <linux/ctype.h>
23 #if (CONFIG_COMMANDS & CFG_CMD_ELF)
26 #define MAX(a,b) ((a) > (b) ? (a) : (b))
29 int valid_elf_image (unsigned long addr);
30 unsigned long load_elf_image (unsigned long addr);
32 /* ======================================================================
33 * Interpreter command to boot an arbitrary ELF image from memory.
34 * ====================================================================== */
35 int do_bootelf (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
37 unsigned long addr; /* Address of the ELF image */
38 unsigned long rc; /* Return value from user code */
40 /* -------------------------------------------------- */
46 addr = simple_strtoul (argv[1], NULL, 16);
48 if (!valid_elf_image (addr))
51 addr = load_elf_image (addr);
53 printf ("## Starting application at 0x%08lx ...\n", addr);
56 * QNX images require the data cache is disabled.
57 * Data cache is already flushed, so just turn it off.
63 * pass address parameter as argv[0] (aka command name),
64 * and all remaining args
66 rc = ((ulong (*)(int, char *[])) addr) (--argc, &argv[1]);
70 printf ("## Application terminated, rc = 0x%lx\n", rc);
74 /* ======================================================================
75 * Interpreter command to boot VxWorks from a memory image. The image can
76 * be either an ELF image or a raw binary. Will attempt to setup the
77 * bootline and other parameters correctly.
78 * ====================================================================== */
79 int do_bootvx ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
81 #if defined(CONFIG_WALNUT) || \
82 defined(CFG_VXWORKS_MAC_PTR)
83 DECLARE_GLOBAL_DATA_PTR;
86 unsigned long addr; /* Address of image */
87 unsigned long bootaddr; /* Address to put the bootline */
88 char *bootline; /* Text of the bootline */
89 char *tmp; /* Temporary char pointer */
91 #if defined(CONFIG_4xx) || defined(CONFIG_IOP480)
92 char build_buf[80]; /* Buffer for building the bootline */
94 /* -------------------------------------------------- */
97 * Check the loadaddr variable.
98 * If we don't know where the image is then we're done.
101 if ((tmp = getenv ("loadaddr")) != NULL) {
102 addr = simple_strtoul (tmp, NULL, 16);
104 puts ("No load address provided\n");
108 #if (CONFIG_COMMANDS & CFG_CMD_NET)
109 /* Check to see if we need to tftp the image ourselves before starting */
111 if ((argc == 2) && (strcmp (argv[1], "tftp") == 0)) {
112 if (NetLoop (TFTP) <= 0)
114 printf ("Automatic boot of VxWorks image at address 0x%08lx ... \n", addr);
118 /* This should equate
119 * to NV_RAM_ADRS + NV_BOOT_OFFSET + NV_ENET_OFFSET
120 * from the VxWorks BSP header files.
121 * This will vary from board to board
124 #if defined(CONFIG_WALNUT)
125 tmp = (char *) CFG_NVRAM_BASE_ADDR + 0x500;
126 memcpy ((char *) tmp, (char *) &gd->bd->bi_enetaddr[3], 3);
127 #elif defined(CFG_VXWORKS_MAC_PTR)
128 tmp = (char *) CFG_VXWORKS_MAC_PTR;
129 memcpy ((char *) tmp, (char *) &gd->bd->bi_enetaddr[0], 6);
131 puts ("## Ethernet MAC address not copied to NV RAM\n");
135 * Use bootaddr to find the location in memory that VxWorks
136 * will look for the bootline string. The default value for
137 * PowerPC is LOCAL_MEM_LOCAL_ADRS + BOOT_LINE_OFFSET which
141 if ((tmp = getenv ("bootaddr")) == NULL)
144 bootaddr = simple_strtoul (tmp, NULL, 16);
147 * Check to see if the bootline is defined in the 'bootargs'
148 * parameter. If it is not defined, we may be able to
152 if ((bootline = getenv ("bootargs")) != NULL) {
153 memcpy ((void *) bootaddr, bootline, MAX(strlen(bootline), 255));
154 flush_cache (bootaddr, MAX(strlen(bootline), 255));
156 #if defined(CONFIG_4xx)
157 sprintf (build_buf, "ibmEmac(0,0)");
159 if ((tmp = getenv ("hostname")) != NULL) {
160 sprintf (&build_buf[strlen (build_buf - 1)],
163 sprintf (&build_buf[strlen (build_buf - 1)],
167 if ((tmp = getenv ("ipaddr")) != NULL) {
168 sprintf (&build_buf[strlen (build_buf - 1)],
171 memcpy ((void *)bootaddr, build_buf, MAX(strlen(build_buf), 255));
172 flush_cache (bootaddr, MAX(strlen(build_buf), 255));
173 #elif defined(CONFIG_IOP480)
174 sprintf (build_buf, "dc(0,0)");
176 if ((tmp = getenv ("hostname")) != NULL) {
177 sprintf (&build_buf[strlen (build_buf - 1)],
180 sprintf (&build_buf[strlen (build_buf - 1)],
184 if ((tmp = getenv ("ipaddr")) != NULL) {
185 sprintf (&build_buf[strlen (build_buf - 1)],
188 memcpy ((void *) bootaddr, build_buf, MAX(strlen(build_buf), 255));
189 flush_cache (bootaddr, MAX(strlen(build_buf), 255));
193 * I'm not sure what the device should be for other
194 * PPC flavors, the hostname and ipaddr should be ok
198 puts ("No bootargs defined\n");
204 * If the data at the load address is an elf image, then
205 * treat it like an elf image. Otherwise, assume that it is a
209 if (valid_elf_image (addr)) {
210 addr = load_elf_image (addr);
212 puts ("## Not an ELF image, assuming binary\n");
213 /* leave addr as load_addr */
216 printf ("## Using bootline (@ 0x%lx): %s\n", bootaddr,
218 printf ("## Starting vxWorks at 0x%08lx ...\n", addr);
220 ((void (*)(void)) addr) ();
222 puts ("## vxWorks terminated\n");
226 /* ======================================================================
227 * Determine if a valid ELF image exists at the given memory location.
228 * First looks at the ELF header magic field, the makes sure that it is
229 * executable and makes sure that it is for a PowerPC.
230 * ====================================================================== */
231 int valid_elf_image (unsigned long addr)
233 Elf32_Ehdr *ehdr; /* Elf header structure pointer */
235 /* -------------------------------------------------- */
237 ehdr = (Elf32_Ehdr *) addr;
239 if (!IS_ELF (*ehdr)) {
240 printf ("## No elf image at address 0x%08lx\n", addr);
244 if (ehdr->e_type != ET_EXEC) {
245 printf ("## Not a 32-bit elf image at address 0x%08lx\n",
251 if (ehdr->e_machine != EM_PPC) {
252 printf ("## Not a PowerPC elf image at address 0x%08lx\n",
262 /* ======================================================================
263 * A very simple elf loader, assumes the image is valid, returns the
264 * entry point address.
265 * ====================================================================== */
266 unsigned long load_elf_image (unsigned long addr)
268 Elf32_Ehdr *ehdr; /* Elf header structure pointer */
269 Elf32_Shdr *shdr; /* Section header structure pointer */
270 unsigned char *strtab = 0; /* String table pointer */
271 unsigned char *image; /* Binary image pointer */
272 int i; /* Loop counter */
274 /* -------------------------------------------------- */
276 ehdr = (Elf32_Ehdr *) addr;
278 /* Find the section header string table for output info */
279 shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
280 (ehdr->e_shstrndx * sizeof (Elf32_Shdr)));
282 if (shdr->sh_type == SHT_STRTAB)
283 strtab = (unsigned char *) (addr + shdr->sh_offset);
285 /* Load each appropriate section */
286 for (i = 0; i < ehdr->e_shnum; ++i) {
287 shdr = (Elf32_Shdr *) (addr + ehdr->e_shoff +
288 (i * sizeof (Elf32_Shdr)));
290 if (!(shdr->sh_flags & SHF_ALLOC)
291 || shdr->sh_addr == 0 || shdr->sh_size == 0) {
296 printf ("%sing %s @ 0x%08lx (%ld bytes)\n",
297 (shdr->sh_type == SHT_NOBITS) ?
299 &strtab[shdr->sh_name],
300 (unsigned long) shdr->sh_addr,
301 (long) shdr->sh_size);
304 if (shdr->sh_type == SHT_NOBITS) {
305 memset ((void *)shdr->sh_addr, 0, shdr->sh_size);
307 image = (unsigned char *) addr + shdr->sh_offset;
308 memcpy ((void *) shdr->sh_addr,
309 (const void *) image,
312 flush_cache (shdr->sh_addr, shdr->sh_size);
315 return ehdr->e_entry;
318 /* ====================================================================== */
320 bootelf, 2, 0, do_bootelf,
321 "bootelf - Boot from an ELF image in memory\n",
322 " [address] - load address of ELF image.\n"
326 bootvx, 2, 0, do_bootvx,
327 "bootvx - Boot vxWorks from an ELF image\n",
328 " [address] - load address of vxWorks ELF image.\n"
331 #endif /* CFG_CMD_ELF */