2 * Command line interface for libnvram
4 * Copyright 2009, Jo-Philipp Wich <xm@subsignal.org>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 * The libnvram code is based on Broadcom code for Linux 2.4.x .
28 static nvram_handle_t
* nvram_open_rdonly(void)
30 char *file
= nvram_find_staging();
33 file
= nvram_find_mtd();
36 nvram_handle_t
*h
= nvram_open(file
, NVRAM_RO
);
37 if( strcmp(file
, NVRAM_STAGING
) )
45 static nvram_handle_t
* nvram_open_staging(void)
47 if( nvram_find_staging() != NULL
|| nvram_to_staging() == 0 )
48 return nvram_open(NVRAM_STAGING
, NVRAM_RW
);
53 static int do_show(nvram_handle_t
*nvram
)
58 if( (t
= nvram_getall(nvram
)) != NULL
)
62 printf("%s=%s\n", t
->name
, t
->value
);
72 static int do_get(nvram_handle_t
*nvram
, const char *var
)
77 if( (val
= nvram_get(nvram
, var
)) != NULL
)
86 static int do_unset(nvram_handle_t
*nvram
, const char *var
)
88 return nvram_unset(nvram
, var
);
91 static int do_set(nvram_handle_t
*nvram
, const char *pair
)
93 char *val
= strstr(pair
, "=");
94 char var
[strlen(pair
)];
99 memset(var
, 0, sizeof(var
));
100 strncpy(var
, pair
, (int)(val
-pair
));
101 stat
= nvram_set(nvram
, var
, (char *)(val
+ 1));
107 static int do_info(nvram_handle_t
*nvram
)
109 nvram_header_t
*hdr
= nvram_header(nvram
);
111 /* CRC8 over the last 11 bytes of the header and data bytes */
112 uint8_t crc
= hndcrc8((unsigned char *) &hdr
[0] + NVRAM_CRC_START_POSITION
,
113 hdr
->len
- NVRAM_CRC_START_POSITION
, 0xff);
116 printf("Magic: 0x%08X\n", hdr
->magic
);
117 printf("Length: 0x%08X\n", hdr
->len
);
118 printf("Offset: 0x%08X\n", nvram
->offset
);
120 printf("CRC8: 0x%02X (calculated: 0x%02X)\n",
121 hdr
->crc_ver_init
& 0xFF, crc
);
123 printf("Version: 0x%02X\n", (hdr
->crc_ver_init
>> 8) & 0xFF);
124 printf("SDRAM init: 0x%04X\n", (hdr
->crc_ver_init
>> 16) & 0xFFFF);
125 printf("SDRAM config: 0x%04X\n", hdr
->config_refresh
& 0xFFFF);
126 printf("SDRAM refresh: 0x%04X\n", (hdr
->config_refresh
>> 16) & 0xFFFF);
127 printf("NCDL values: 0x%08X\n\n", hdr
->config_ncdl
);
129 printf("%i bytes used / %i bytes available (%.2f%%)\n",
130 hdr
->len
, nvram
->length
- nvram
->offset
- hdr
->len
,
131 (100.00 / (double)(nvram
->length
- nvram
->offset
)) * (double)hdr
->len
);
137 int main( int argc
, const char *argv
[] )
139 nvram_handle_t
*nvram
;
146 /* Ugly... iterate over arguments to see whether we can expect a write */
147 for( i
= 1; i
< argc
; i
++ )
148 if( ( !strcmp(argv
[i
], "set") && ++i
< argc
) ||
149 ( !strcmp(argv
[i
], "unset") && ++i
< argc
) ||
150 !strcmp(argv
[i
], "commit") )
157 nvram
= write
? nvram_open_staging() : nvram_open_rdonly();
159 if( nvram
!= NULL
&& argc
> 1 )
161 for( i
= 1; i
< argc
; i
++ )
163 if( !strcmp(argv
[i
], "show") )
165 stat
= do_show(nvram
);
168 else if( !strcmp(argv
[i
], "info") )
170 stat
= do_info(nvram
);
173 else if( !strcmp(argv
[i
], "get") || !strcmp(argv
[i
], "unset") || !strcmp(argv
[i
], "set") )
180 stat
= do_get(nvram
, argv
[i
]);
184 stat
= do_unset(nvram
, argv
[i
]);
188 stat
= do_set(nvram
, argv
[i
]);
195 fprintf(stderr
, "Command '%s' requires an argument!\n", argv
[i
]);
200 else if( !strcmp(argv
[i
], "commit") )
207 fprintf(stderr
, "Unknown option '%s' !\n", argv
[i
]);
214 stat
= nvram_commit(nvram
);
219 stat
= staging_to_nvram();
225 "Could not open nvram! Possible reasons are:\n"
226 " - No device found (/proc not mounted or no nvram present)\n"
227 " - Insufficient permissions to open mtd device\n"
228 " - Insufficient memory to complete operation\n"
229 " - Memory mapping failed or not supported\n"
240 " nvram get variable\n"
241 " nvram set variable=value [set ...]\n"
242 " nvram unset variable [unset ...]\n"