1 | /*
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2 | * nandwrite and nanddump ported to busybox from mtd-utils
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3 | *
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4 | * Author: Baruch Siach <baruch@tkos.co.il>, Orex Computed Radiography
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5 | *
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6 | * Licensed under GPLv2, see file LICENSE in this source tree.
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7 | *
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8 | * TODO: add support for large (>4GB) MTD devices
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9 | */
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10 |
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11 | //applet:IF_NANDWRITE(APPLET(nandwrite, _BB_DIR_USR_SBIN, _BB_SUID_DROP))
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12 | //applet:IF_NANDWRITE(APPLET_ODDNAME(nanddump, nandwrite, _BB_DIR_USR_SBIN, _BB_SUID_DROP, nanddump))
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13 |
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14 | //kbuild:lib-$(CONFIG_NANDWRITE) += nandwrite.o
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15 | //kbuild:lib-$(CONFIG_NANDDUMP) += nandwrite.o
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16 |
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17 | //config:config NANDWRITE
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18 | //config: bool "nandwrite"
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19 | //config: default n
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20 | //config: depends on PLATFORM_LINUX
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21 | //config: help
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22 | //config: Write to the specified MTD device, with bad blocks awareness
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23 | //config:
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24 | //config:config NANDDUMP
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25 | //config: bool "nanddump"
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26 | //config: default n
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27 | //config: depends on PLATFORM_LINUX
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28 | //config: help
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29 | //config: Dump the content of raw NAND chip
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30 |
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31 | //usage:#define nandwrite_trivial_usage
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32 | //usage: "[-p] [-s ADDR] MTD_DEVICE [FILE]"
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33 | //usage:#define nandwrite_full_usage "\n\n"
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34 | //usage: "Write to the specified MTD device\n"
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35 | //usage: "\nOptions:"
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36 | //usage: "\n -p Pad to page size"
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37 | //usage: "\n -s ADDR Start address"
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38 |
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39 | //usage:#define nanddump_trivial_usage
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40 | //usage: "[-o] [-b] [-s ADDR] [-f FILE] MTD_DEVICE"
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41 | //usage:#define nanddump_full_usage "\n\n"
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42 | //usage: "Dump the sepcified MTD device\n"
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43 | //usage: "\nOptions:"
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44 | //usage: "\n -o Omit oob data"
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45 | //usage: "\n -b Omit bad block from the dump"
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46 | //usage: "\n -s ADDR Start address"
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47 | //usage: "\n -l LEN Length"
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48 | //usage: "\n -f FILE Dump to file ('-' for stdout)"
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49 |
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50 | #include "libbb.h"
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51 | #include <mtd/mtd-user.h>
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52 |
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53 | #define IS_NANDDUMP (ENABLE_NANDDUMP && (!ENABLE_NANDWRITE || (applet_name[4] == 'd')))
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54 | #define IS_NANDWRITE (ENABLE_NANDWRITE && (!ENABLE_NANDDUMP || (applet_name[4] != 'd')))
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55 |
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56 | #define OPT_p (1 << 0) /* nandwrite only */
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57 | #define OPT_o (1 << 0) /* nanddump only */
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58 | #define OPT_s (1 << 1)
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59 | #define OPT_b (1 << 2)
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60 | #define OPT_f (1 << 3)
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61 | #define OPT_l (1 << 4)
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62 |
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63 | /* helper for writing out 0xff for bad blocks pad */
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64 | static void dump_bad(struct mtd_info_user *meminfo, unsigned len, int oob)
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65 | {
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66 | unsigned char buf[meminfo->writesize];
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67 | unsigned count;
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68 |
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69 | /* round len to the next page */
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70 | len = (len | ~(meminfo->writesize - 1)) + 1;
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71 |
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72 | memset(buf, 0xff, sizeof(buf));
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73 | for (count = 0; count < len; count += meminfo->writesize) {
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74 | xwrite(STDOUT_FILENO, buf, meminfo->writesize);
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75 | if (oob)
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76 | xwrite(STDOUT_FILENO, buf, meminfo->oobsize);
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77 | }
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78 | }
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79 |
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80 | static unsigned next_good_eraseblock(int fd, struct mtd_info_user *meminfo,
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81 | unsigned block_offset)
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82 | {
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83 | while (1) {
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84 | loff_t offs;
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85 |
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86 | if (block_offset >= meminfo->size) {
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87 | if (IS_NANDWRITE)
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88 | bb_error_msg_and_die("not enough space in MTD device");
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89 | return block_offset; /* let the caller exit */
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90 | }
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91 | offs = block_offset;
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92 | if (xioctl(fd, MEMGETBADBLOCK, &offs) == 0)
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93 | return block_offset;
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94 | /* ioctl returned 1 => "bad block" */
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95 | if (IS_NANDWRITE)
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96 | printf("Skipping bad block at 0x%08x\n", block_offset);
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97 | block_offset += meminfo->erasesize;
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98 | }
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99 | }
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100 |
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101 | int nandwrite_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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102 | int nandwrite_main(int argc UNUSED_PARAM, char **argv)
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103 | {
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104 | /* Buffer for OOB data */
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105 | unsigned char *oobbuf;
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106 | unsigned opts;
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107 | int fd;
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108 | ssize_t cnt;
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109 | unsigned mtdoffset, meminfo_writesize, blockstart, limit;
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110 | unsigned end_addr = ~0;
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111 | struct mtd_info_user meminfo;
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112 | struct mtd_oob_buf oob;
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113 | unsigned char *filebuf;
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114 | const char *opt_s = "0", *opt_f = "-", *opt_l;
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115 |
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116 | if (IS_NANDDUMP) {
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117 | opt_complementary = "=1";
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118 | opts = getopt32(argv, "os:bf:l:", &opt_s, &opt_f, &opt_l);
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119 | } else { /* nandwrite */
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120 | opt_complementary = "-1:?2";
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121 | opts = getopt32(argv, "ps:", &opt_s);
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122 | }
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123 | argv += optind;
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124 |
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125 | if (IS_NANDWRITE && argv[1])
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126 | opt_f = argv[1];
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127 | if (!LONE_DASH(opt_f)) {
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128 | int tmp_fd = xopen(opt_f,
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129 | IS_NANDDUMP ? O_WRONLY | O_TRUNC | O_CREAT : O_RDONLY
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130 | );
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131 | xmove_fd(tmp_fd, IS_NANDDUMP ? STDOUT_FILENO : STDIN_FILENO);
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132 | }
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133 |
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134 | fd = xopen(argv[0], O_RDWR);
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135 | xioctl(fd, MEMGETINFO, &meminfo);
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136 |
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137 | mtdoffset = xstrtou(opt_s, 0);
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138 | if (IS_NANDDUMP && (opts & OPT_l)) {
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139 | unsigned length = xstrtou(opt_l, 0);
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140 | if (length < meminfo.size - mtdoffset)
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141 | end_addr = mtdoffset + length;
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142 | }
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143 |
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144 | /* Pull it into a CPU register (hopefully) - smaller code that way */
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145 | meminfo_writesize = meminfo.writesize;
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146 |
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147 | if (mtdoffset & (meminfo_writesize - 1))
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148 | bb_error_msg_and_die("start address is not page aligned");
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149 |
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150 | filebuf = xmalloc(meminfo_writesize);
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151 | oobbuf = xmalloc(meminfo.oobsize);
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152 |
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153 | oob.start = 0;
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154 | oob.length = meminfo.oobsize;
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155 | oob.ptr = oobbuf;
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156 |
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157 | blockstart = mtdoffset & ~(meminfo.erasesize - 1);
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158 | if (blockstart != mtdoffset) {
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159 | unsigned tmp;
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160 | /* mtdoffset is in the middle of an erase block, verify that
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161 | * this block is OK. Advance mtdoffset only if this block is
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162 | * bad.
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163 | */
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164 | tmp = next_good_eraseblock(fd, &meminfo, blockstart);
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165 | if (tmp != blockstart) {
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166 | /* bad block(s), advance mtdoffset */
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167 | if (IS_NANDDUMP & !(opts & OPT_b)) {
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168 | int bad_len = MIN(tmp, end_addr) - mtdoffset;
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169 | dump_bad(&meminfo, bad_len, !(opts & OPT_o));
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170 | }
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171 | mtdoffset = tmp;
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172 | }
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173 | }
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174 |
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175 | cnt = -1;
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176 | limit = MIN(meminfo.size, end_addr);
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177 | while (mtdoffset < limit) {
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178 | int input_fd = IS_NANDWRITE ? STDIN_FILENO : fd;
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179 | int output_fd = IS_NANDWRITE ? fd : STDOUT_FILENO;
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180 |
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181 | blockstart = mtdoffset & ~(meminfo.erasesize - 1);
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182 | if (blockstart == mtdoffset) {
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183 | /* starting a new eraseblock */
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184 | mtdoffset = next_good_eraseblock(fd, &meminfo, blockstart);
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185 | if (IS_NANDWRITE)
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186 | printf("Writing at 0x%08x\n", mtdoffset);
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187 | else if (mtdoffset > blockstart) {
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188 | int bad_len = MIN(mtdoffset, limit) - blockstart;
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189 | dump_bad(&meminfo, bad_len, !(opts & OPT_o));
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190 | }
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191 | if (mtdoffset >= limit)
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192 | break;
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193 | }
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194 | xlseek(fd, mtdoffset, SEEK_SET);
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195 |
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196 | /* get some more data from input */
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197 | cnt = full_read(input_fd, filebuf, meminfo_writesize);
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198 | if (cnt == 0) {
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199 | /* even with -p, we do not pad past the end of input
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200 | * (-p only zero-pads last incomplete page)
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201 | */
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202 | break;
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203 | }
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204 | if (cnt < meminfo_writesize) {
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205 | if (IS_NANDDUMP)
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206 | bb_error_msg_and_die("short read");
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207 | if (!(opts & OPT_p))
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208 | bb_error_msg_and_die("input size is not rounded up to page size, "
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209 | "use -p to zero pad");
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210 | /* zero pad to end of write block */
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211 | memset(filebuf + cnt, 0, meminfo_writesize - cnt);
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212 | }
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213 | xwrite(output_fd, filebuf, meminfo_writesize);
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214 |
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215 | if (IS_NANDDUMP && !(opts & OPT_o)) {
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216 | /* Dump OOB data */
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217 | oob.start = mtdoffset;
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218 | xioctl(fd, MEMREADOOB, &oob);
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219 | xwrite(output_fd, oobbuf, meminfo.oobsize);
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220 | }
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221 |
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222 | mtdoffset += meminfo_writesize;
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223 | if (cnt < meminfo_writesize)
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224 | break;
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225 | }
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226 |
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227 | if (IS_NANDWRITE && cnt != 0) {
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228 | /* We filled entire MTD, but did we reach EOF on input? */
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229 | if (full_read(STDIN_FILENO, filebuf, meminfo_writesize) != 0) {
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230 | /* no */
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231 | bb_error_msg_and_die("not enough space in MTD device");
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232 | }
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233 | }
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234 |
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235 | if (ENABLE_FEATURE_CLEAN_UP) {
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236 | free(filebuf);
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237 | close(fd);
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238 | }
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239 |
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240 | return EXIT_SUCCESS;
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241 | }
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