+int readenv(size_t offset, u_char *buf)
+{
+ size_t end = offset + CONFIG_ENV_RANGE;
+ size_t amount_loaded = 0;
+ size_t blocksize, len;
+ u_char *char_ptr;
+
+ blocksize = nand_info[0].erasesize;
+ if (!blocksize)
+ return 1;
+
+ len = min(blocksize, CONFIG_ENV_SIZE);
+
+ while (amount_loaded < CONFIG_ENV_SIZE && offset < end) {
+ if (nand_block_isbad(&nand_info[0], offset)) {
+ offset += blocksize;
+ } else {
+ char_ptr = &buf[amount_loaded];
+ if (nand_read_skip_bad(&nand_info[0], offset,
+ &len, NULL,
+ nand_info[0].size, char_ptr))
+ return 1;
+
+ offset += blocksize;
+ amount_loaded += len;
+ }
+ }
+
+ if (amount_loaded != CONFIG_ENV_SIZE)
+ return 1;
+
+ return 0;
+}
+
+#ifdef CONFIG_ENV_OFFSET_OOB
+int get_nand_env_oob(nand_info_t *nand, unsigned long *result)
+{
+ struct mtd_oob_ops ops;
+ uint32_t oob_buf[ENV_OFFSET_SIZE / sizeof(uint32_t)];
+ int ret;
+
+ ops.datbuf = NULL;
+ ops.mode = MTD_OOB_AUTO;
+ ops.ooboffs = 0;
+ ops.ooblen = ENV_OFFSET_SIZE;
+ ops.oobbuf = (void *)oob_buf;
+
+ ret = nand->read_oob(nand, ENV_OFFSET_SIZE, &ops);
+ if (ret) {
+ printf("error reading OOB block 0\n");
+ return ret;
+ }
+
+ if (oob_buf[0] == ENV_OOB_MARKER) {
+ *result = oob_buf[1] * nand->erasesize;
+ } else if (oob_buf[0] == ENV_OOB_MARKER_OLD) {
+ *result = oob_buf[1];
+ } else {
+ printf("No dynamic environment marker in OOB block 0\n");
+ return -ENOENT;
+ }
+
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_ENV_OFFSET_REDUND
+void env_relocate_spec(void)