int do_revert(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
    ulong size = 0, floffset = 0, flsize = 0;
    struct mtd_partition_info *mpi = NULL;

    mpi = get_partition("lginit");
    if(!mpi) {
        printf("unknown partition : %s\n", "lginit");
        return -1;
    }

    mpi->filesize = 0;
    mpi->sw_ver = 0;

    nand_erase(&nand_info[0], mpi->offset, mpi->size);

    mpi = get_partition("lgapp");
    if(!mpi) {
        printf("unknown partition : %s\n", "lgapp");
        return -1;
    }

    mpi->filesize = 0;
    mpi->sw_ver = 0;

    nand_erase(&nand_info[0], mpi->offset, mpi->size);

    mpi = get_partition("lgfont");
    if(!mpi) {
        printf("unknown partition : %s\n", "lgfont");
        return -1;
    }

    mpi->filesize = 0;
    mpi->sw_ver = 0;

    nand_erase(&nand_info[0], mpi->offset, mpi->size);

    mpi = get_partition("kernel");
    if(!mpi) {
        printf("unknown partition : %s\n", "kernel");
        return 0;
    }

    floffset    = (ulong)(mpi->offset + CFG_FLASH_BASE);
    flsize      = (ulong)mpi->size;
    sprintf(mpi->filename, "uImage"); //to revert to normal

    size = tftp_get(mpi->filename);
    if(size == 0) {
        printf("size is zero..!!\n");
        return -1;
    }

    if(size > flsize) {
        printf("out of partition size : %x / %x\n", (unsigned int)size, (unsigned int)flsize);
        return -1;
    }

    write_flash_data(&nand_info[0], (ulong)floffset, (ulong)size, (u_char *)default_offset);
    mpi->filesize = size;

    save_mtdinfo();

    return 0;
}