On 20 Oct 2000, Krzys Majewski wrote: > I don't know how to say this properly.. when backing up files from my > IDE hard drive to my parallel port ZIP100 drive, the machine > occasionally blocks: it's like everything freezes for about half a > minute before I can do anything again. This only happens when the ZIP > drive is running (not sure if it's R or W or both). This is with > kernel 2.2.17, using the imm driver as a module. I've set all the > default "safe" options for the driver, like "slow and reliable" or > whatnot. Is this a kernel bug? IMM driver bug? User bug? Feature? > Help? chris >
I got a great response to this from someone who suggested enabling ECP in the BIOS and assigning a DMA. I did the first (BIOS now says: "ECP+EPP ECP Mode use DMA 3 EPP Mode Select EPP1.7") but don't know how to do the second. Reading /usr/src/linux/Documentation/parport.txt didn't help. 11:24:02<~>$ cat /proc/parport/0/hardware base: 0x378 irq: none dma: none modes: SPP,ECP,ECPEPP,ECPPS2 Notice the lack of DMA. How to fix this? I'm getting lots of errors on the ZIP drive now, e.g. localhost kernel: SCSI disk error : host 1 channel 0 id 6 lun 0 return code = 27010000 localhost kernel: scsidisk I/O error: dev 08:04, sector 32345 localhost kernel: file_cluster badly computed!!! 2248 <> 3784 and more. I can occasionally read/write the ZIP drive but basically it is unuseable in this state. -chris
