mtd_mod_by_eb
if (mtd_mod_by_eb(ofs, mtd)) {
if (mtd_mod_by_eb(len, mtd)) {
ebofs = mtd_mod_by_eb(start, mtd);
block_ofs = mtd_mod_by_eb((u32)from, mtd);
mod = mtd_mod_by_eb(req->addr, mtd);
mod = mtd_mod_by_eb(req->addr + req->len, mtd);
return mtd_div_by_ws(mtd_mod_by_eb(offs, mtd), mtd);