Sergei Shtylyov wrote: > Hello. > > Albert Lee wrote: > >> Thanks for the detailed log. >> It looks like the bad INQUIRY command >> "CDB (4:0,1,0) 12 01 00 00 fe 00 00 00 00" (INQUIRY, length=254, >> EVPD=1) >> is coming from the user space, not the SCSI mid-layer. > > >> I guess two problems together caused this bug: >> 1. Ubuntu Linux issues an incorrect INQUIRY command to the drive. >> (Other distros seem to have the INQUIRY correct.) > > > But what is incorrect about sending INQUIRY with EVPD bit? Nothing wrong from the SCSI point of view. However, in the early ATAPI spec (sff-8020i), this EVPD bit is "reserved". And apprently some imperfect ATAPI CD-ROM drive doesn't handle it well when EVPD = 1. :( Hmm, how about the revised version: 1. Ubuntu Linux issues a correct INQUIRY command to the drive which set EVPD = 1. However, EVPD is "reserved" per early ATAPI spec and the AOpen 56X/AKH drive times out in this case. ... -- albert - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
