edid_block_compute_checksum
if (edid_block_compute_checksum(block) != edid_block_get_checksum(block)) {
edid_block_compute_checksum(block));
edid_block_compute_checksum(block));
edid->checksum = edid_block_compute_checksum(edid);
edid_block_compute_checksum(edid + last_block);