udc_csect
sreg.udc_csect, sreg.udc_chead, sreg.udc_ccyl,
if (sreg.udc_csect != creg.udc_dsect + creg.udc_scnt - 1) {
sreg.udc_dma7, 512 * (sreg.udc_csect -
(sreg.udc_csect - creg.udc_dsect) - 1;
creg.udc_dsect = sreg.udc_csect + 1;