Hi SAW if not find these print message,iso interrupt is not happen. printk("bstat =%x hp->itl1_len=%d\n",bstat,hp->itl1_len); or printk("bstat =%x hp->itl0_len=%d\n",bstat,hp->itl0_len); in isp116x.c[hc_interrupt] And you know many printk massage disturb isoc transfer. So reduce character to print. For example printk("bstat =%x hp->itl1_len=%d\n",bstat,hp->itl1_len); --->printk("%x %d\n",bstat,hp->itl1_len); Finaly I can not use printk,so make some tool to write value to SRAM memory. I have no idea to help you now...... I receive some report of isp1161 from guys everyday. visit http://www.geocities.jp/linux_on_tango/downloadfiles/isp1161_tango_driver.html you may get some hint someday. adsynori v(^o^) ------------------------------------------------------- This SF.Net email is sponsored by OSTG. Have you noticed the changes on Linux.com, ITManagersJournal and NewsForge in the past few weeks? Now, one more big change to announce. We are now OSTG- Open Source Technology Group. Come see the changes on the new OSTG site. www.ostg.com _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel