]>
git.ipfire.org Git - thirdparty/u-boot.git/blob - tools/mkenvimage.c
3a20b23ed16eb856613b4f571c6c257eb31a4732
2 * (C) Copyright 2011 Free Electrons
3 * David Wagner <david.wagner@free-electrons.com>
5 * Inspired from envcrc.c:
7 * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
9 * See file CREDITS for list of people who contributed to this
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation; either version 2 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 /* We want the GNU version of basename() */
38 #include <sys/types.h>
43 #include <u-boot/crc.h>
46 #define CRC_SIZE sizeof(uint32_t)
48 static void usage(const char *exec_name
)
50 fprintf(stderr
, "%s [-h] [-r] [-b] [-p <byte>] -s <environment partition size> -o <output> <input file>\n"
52 "This tool takes a key=value input file (same as would a `printenv' show) and generates the corresponding environment image, ready to be flashed.\n"
54 "\tThe input file is in format:\n"
58 "\t-r : the environment has multiple copies in flash\n"
59 "\t-b : the target is big endian (default is little endian)\n"
60 "\t-p <byte> : fill the image with <byte> bytes instead of 0xff bytes\n"
61 "\t-V : print version information and exit\n"
63 "If the input file is \"-\", data is read from standard input\n",
67 long int xstrtol(const char *s
)
72 tmp
= strtol(s
, NULL
, 0);
77 fprintf(stderr
, "Bad integer format: %s\n", s
);
79 fprintf(stderr
, "Error while parsing %s: %s\n", s
,
85 int main(int argc
, char **argv
)
87 uint32_t crc
, targetendian_crc
;
88 const char *txt_filename
= NULL
, *bin_filename
= NULL
;
90 unsigned char *dataptr
, *envptr
;
91 unsigned char *filebuf
= NULL
;
92 unsigned int filesize
= 0, envsize
= 0, datasize
= 0;
95 unsigned char padbyte
= 0xff;
98 int ret
= EXIT_SUCCESS
;
100 struct stat txt_file_stat
;
105 prg
= basename(argv
[0]);
107 /* Turn off getopt()'s internal error message */
110 /* Parse the cmdline */
111 while ((option
= getopt(argc
, argv
, ":s:o:rbp:hV")) != -1) {
114 datasize
= xstrtol(optarg
);
117 bin_filename
= strdup(optarg
);
119 fprintf(stderr
, "Can't strdup() the output filename\n");
130 padbyte
= xstrtol(optarg
);
136 printf("%s version %s\n", prg
, PLAIN_VERSION
);
139 fprintf(stderr
, "Missing argument for option -%c\n",
144 fprintf(stderr
, "Wrong option -%c\n", optopt
);
150 /* Check datasize and allocate the data */
152 fprintf(stderr
, "Please specify the size of the environment partition.\n");
157 dataptr
= malloc(datasize
* sizeof(*dataptr
));
159 fprintf(stderr
, "Can't alloc %d bytes for dataptr.\n",
165 * envptr points to the beginning of the actual environment (after the
166 * crc and possible `redundant' byte
168 envsize
= datasize
- (CRC_SIZE
+ redundant
);
169 envptr
= dataptr
+ CRC_SIZE
+ redundant
;
171 /* Pad the environment with the padding byte */
172 memset(envptr
, padbyte
, envsize
);
174 /* Open the input file ... */
175 if (optind
>= argc
|| strcmp(argv
[optind
], "-") == 0) {
177 int readlen
= sizeof(*envptr
) * 4096;
178 txt_fd
= STDIN_FILENO
;
181 filebuf
= realloc(filebuf
, readlen
);
183 fprintf(stderr
, "Can't realloc memory for the input file buffer\n");
186 readbytes
= read(txt_fd
, filebuf
+ filesize
, readlen
);
188 fprintf(stderr
, "Error while reading stdin: %s\n",
192 filesize
+= readbytes
;
193 } while (readbytes
== readlen
);
196 txt_filename
= argv
[optind
];
197 txt_fd
= open(txt_filename
, O_RDONLY
);
199 fprintf(stderr
, "Can't open \"%s\": %s\n",
200 txt_filename
, strerror(errno
));
203 /* ... and check it */
204 ret
= fstat(txt_fd
, &txt_file_stat
);
206 fprintf(stderr
, "Can't stat() on \"%s\": %s\n",
207 txt_filename
, strerror(errno
));
211 filesize
= txt_file_stat
.st_size
;
213 filebuf
= mmap(NULL
, sizeof(*envptr
) * filesize
, PROT_READ
,
214 MAP_PRIVATE
, txt_fd
, 0);
215 if (filebuf
== MAP_FAILED
) {
216 fprintf(stderr
, "mmap (%ld bytes) failed: %s\n",
217 sizeof(*envptr
) * filesize
,
219 fprintf(stderr
, "Falling back to read()\n");
221 filebuf
= malloc(sizeof(*envptr
) * filesize
);
222 ret
= read(txt_fd
, filebuf
, sizeof(*envptr
) * filesize
);
223 if (ret
!= sizeof(*envptr
) * filesize
) {
224 fprintf(stderr
, "Can't read the whole input file (%ld bytes): %s\n",
225 sizeof(*envptr
) * filesize
,
233 /* The +1 is for the additionnal ending \0. See below. */
234 if (filesize
+ 1 > envsize
) {
235 fprintf(stderr
, "The input file is larger than the environment partition size\n");
239 /* Replace newlines separating variables with \0 */
240 for (fp
= 0, ep
= 0 ; fp
< filesize
; fp
++) {
241 if (filebuf
[fp
] == '\n') {
244 * Newlines at the beginning of the file ?
248 } else if (filebuf
[fp
-1] == '\\') {
250 * Embedded newline in a variable.
252 * The backslash was added to the envptr; rewind
253 * and replace it with a newline
258 /* End of a variable */
262 envptr
[ep
++] = filebuf
[fp
];
266 * Make sure there is a final '\0'
267 * And do it again on the next byte to mark the end of the environment.
269 if (envptr
[ep
-1] != '\0') {
272 * The text file doesn't have an ending newline. We need to
273 * check the env size again to make sure we have room for two \0
276 fprintf(stderr
, "The environment file is too large for the target environment storage\n");
284 /* Computes the CRC and put it at the beginning of the data */
285 crc
= crc32(0, envptr
, envsize
);
286 targetendian_crc
= bigendian
? cpu_to_be32(crc
) : cpu_to_le32(crc
);
288 memcpy(dataptr
, &targetendian_crc
, sizeof(uint32_t));
290 if (!bin_filename
|| strcmp(bin_filename
, "-") == 0) {
291 bin_fd
= STDOUT_FILENO
;
293 bin_fd
= creat(bin_filename
, S_IRUSR
| S_IWUSR
| S_IRGRP
|
296 fprintf(stderr
, "Can't open output file \"%s\": %s\n",
297 bin_filename
, strerror(errno
));
302 if (write(bin_fd
, dataptr
, sizeof(*dataptr
) * datasize
) !=
303 sizeof(*dataptr
) * datasize
) {
304 fprintf(stderr
, "write() failed: %s\n", strerror(errno
));