我在自定义 Linux 内核中遇到了 USB 驱动器写入速度慢的问题。我怀疑是硬件问题，但在相同的硬件和 Opensuse 12.1 操作系统下，我的 USB 驱动器的写入速度要快得多。
我还发现，当我的 USB 驱动器插入 OpenSuse 12.1 和我的自定义内核时，dmesg 输出存在显著差异。
OpenSuse12.1 中的 dmesg
[ 665.417077] usb 2-2: USB disconnect, device number 4
[ 668.676014] usb 2-2: new high speed USB device number 5 using ehci_hcd
[ 668.812675] usb 2-2: New USB device found, idVendor=0815, idProduct=2002
[ 668.812679] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 668.812682] usb 2-2: Product: USBInstallMedia
[ 668.812685] usb 2-2: Manufacturer:
[ 668.812687] usb 2-2: SerialNumber: 070B49D39981F580
[ 668.813052] scsi7 : usb-storage 2-2:1.0
[ 669.813701] scsi 7:0:0:0: Direct-Access USBDrive PMAP PQ: 0 ANSI: 6
[ 669.813893] sd 7:0:0:0: Attached scsi generic sg2 type 0
[ 670.912190] sd 7:0:0:0: [sdc] 62554112 512-byte logical blocks: (32.0 GB/29.8 GiB)
[ 670.913182] sd 7:0:0:0: [sdc] Write Protect is off
[ 670.913186] sd 7:0:0:0: [sdc] Mode Sense: 23 00 00 00
[ 670.914181] sd 7:0:0:0: [sdc] No Caching mode page present
[ 670.914185] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[ 670.918180] sd 7:0:0:0: [sdc] No Caching mode page present
[ 670.918184] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[ 670.919112] sdc: sdc1
[ 670.923056] sd 7:0:0:0: [sdc] No Caching mode page present
[ 670.923060] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[ 670.923063] sd 7:0:0:0: [sdc] Attached SCSI removable disk
我的自定义内核中的 dmesg：
usb 2-1: new high speed USB device number 3 using ehci_hcd
usb 2-1: New USB device found, idVendor=0815, idProduct=2002
usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 2-1: Product: USBDrive
usb 2-1: Manufacturer:
usb 2-1: SerialNumber: 070B49D39981F580
ubb: ubb1
从 dmesg 输出来看，我的 USB 设备在 OpenSuse 12.1 中被识别为 scsi 设备，而在我的自定义内核中它没有被识别为 scsi 设备。
我怀疑这可能是我的自定义内核写入速度慢的一个可能原因。如果我错了，请纠正我。
如果我希望我的 USB 设备被识别为 scsi 设备，我是否需要启用任何内核配置？如果是，如果有人能指出我应该修改哪些内核配置，那将很有帮助。谢谢。