Hi, I hope this is the right place to send this, if not please let me know where would be more appropriate. We distribute a 2.6.27-based software load on bootable DVD. It's intended to boot on a system that has no internal DVD drive, so we use USB DVD drives. With most drives we have no problems, but I've received a complaint from someone that has a drive that won't boot our software and I can't figure out why. The same drive will boot a RHEL install disc. Any suggestions you might have would be great. The non-working drive is a Sony, and the relevant boot logs look like this: usb 1-1.6.1: new high speed USB device using ehci_hcd and address 5 scsi9 : usb-storage 1-1.6.1:1.0 scsi 9:0:0:0: Direct-Access Generic Ultra HS-COMBO 2.01 PQ: 0 ANSI: 0 sd 9:0:0:0: Attached scsi generic sg2 type 0 sd 9:0:0:0: [sdc] Attached SCSI removable disk scsi 9:0:0:1: Direct-Access Generic Ultra HS-SD/MMC2 2.01 PQ: 0 ANSI: 0 sd 9:0:0:1: Attached scsi generic sg3 type 0 sd 9:0:0:1: [sdd] Attached SCSI removable disk scsi 8:0:0:0: CD-ROM SONY DVD RW DRU-840A SS01 PQ: 0 ANSI: 0 sr0: scsi3-mmc drive: 12x/40x writer dvd-ram cd/rw xa/form2 cdda tray Uniform CD-ROM driver Revision: 3.20 sr 8:0:0:0: Attached scsi generic sg4 type 5 md: Waiting for all devices to be available before autodetect md: If you don't use raid, use raid=noautodetect md: Autodetecting RAID arrays. md: Scanned 0 and added 0 devices. md: autorun ... md: ... autorun DONE. VFS: Cannot open root device "sr0" or unknown-block(11,0) Please append a correct "root=" boot option; here are the available partitions: 0810 879087384 sdb driver: sd 0800 879087384 sda driver: sd 0b00 1048575 sr0 driver: sr VFS: Unable to mount root fs on unknown-block(11,0) User configuration error - no valid root filesystem found I'm confused why it can't open sr0 when it clearly lists sr0 as one of the available partitions. On a working Lite-On drive plugged into the same system with the same install media, the equivalent logs are: usb 1-1.6.1: new high speed USB device using ehci_hcd and address 5 scsi9 : usb-storage 1-1.6.1:1.0 scsi 8:0:0:0: CD-ROM Slimtype eSAU208 2 ML05 PQ: 0 ANSI: 0 sr0: scsi3-mmc drive: 62x/62x writer dvd-ram cd/rw xa/form2 cdda pop-up Uniform CD-ROM driver Revision: 3.20 sr 8:0:0:0: Attached scsi generic sg2 type 5 scsi 9:0:0:0: Direct-Access Generic Ultra HS-COMBO 2.01 PQ: 0 ANSI: 0 sd 9:0:0:0: Attached scsi generic sg3 type 0 sd 9:0:0:0: [sdc] Attached SCSI removable disk scsi 9:0:0:1: Direct-Access Generic Ultra HS-SD/MMC2 2.01 PQ: 0 ANSI: 0 sd 9:0:0:1: Attached scsi generic sg4 type 0 sd 9:0:0:1: [sdd] Attached SCSI removable disk md: Waiting for all devices to be available before autodetect md: If you don't use raid, use raid=noautodetect md: Autodetecting RAID arrays. md: Scanned 0 and added 0 devices. md: autorun ... md: ... autorun DONE. VFS: Mounted root (iso9660 filesystem) readonly on device 11:0. devtmpfs: mounted Freeing unused kernel memory: 656k freed ===================================================================== Transferring basename: typhoon-unit0 Sourcing isolinux/tftpboot/cnp/x86_ng/7.0.0/targets/sb_rms/common//etc/sysconfig/pivotroot Setting up rootfs... Chris -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
