USB storage

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Revision as of 19:18, 18 February 2007 by Tjyang (Talk | contribs)
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Contents

Installation

Install USB Kernel modules

 ipkg install kmod-usb-uhci // this is for USB 1.1
 ipkg install kmod-usb-core
 ipkg install kmod-usb2
 ipkg install kmod-usb-storage

Manual installation and check

  • insert the modules one by one.

Check

  • See the enabling from dmesg output. A SanDisk Model: U3 Cruzer Micro 4G flash drive as recognized.
/ # dmesg
<0>CPU revision is: 00029006
<0>Linux version 2.4.34-pre2 (root@linux) (gcc version 3.4.6 (OpenWrt-2.0)) #170 Fri Sep 15 20:10:21 CEST 2006
<0>Setting the PFC value as 0x15
<0>Determined physical RAM map:
<0> memory: 02000000 @ 00000000 (usable)
<0>On node 0 totalpages: 8192
<0>zone(0): 8192 pages.
<0>zone(1): 0 pages.
<0>zone(2): 0 pages.
<0>Kernel command line: root=/dev/mtdblock2 rootfstype=squashfs,jffs2 noinitrd console=ttyS0,115200
<0>CPU: BCM4704 rev 8 at 264 MHz
<0>Using 132.000 MHz high precision timer.
<0>Calibrating delay loop... 263.78 BogoMIPS
<6>Dentry cache hash table entries: 4096 (order: 3, 32768 bytes)
<6>Inode cache hash table entries: 2048 (order: 2, 16384 bytes)
<6>Mount cache hash table entries: 512 (order: 0, 4096 bytes)
<6>Buffer cache hash table entries: 1024 (order: 0, 4096 bytes)
<0>Page-cache hash table entries: 8192 (order: 3, 32768 bytes)
<0>Checking for 'wait' instruction...  unavailable.
<0>POSIX conformance testing by UNIFIX
<0>PCI: Fixing up bus 0
<0>PCI: Fixing up bridge
<7>PCI: Setting latency timer of device 01:00.0 to 64
<0>PCI: Fixing up bus 1
<0>Initializing RT netlink socket
<0>Starting kswapd
<6>devfs: v1.12c (20020818) Richard Gooch (rgooch@atnf.csiro.au)
<6>devfs: boot_options: 0x1
<6>squashfs: version 3.0 (2006/03/15) Phillip Lougher
<0>pty: 256 Unix98 ptys configured
<6>Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ SERIAL_PCI enabled
<6>ttyS00 at 0xb8000300 (irq = 3) is a 16550A
<6>ttyS01 at 0xb8000400 (irq = 3) is a 16550A
<6>Software Watchdog Timer: 0.05, timer margin: 60 sec
<7>PCI: Setting latency timer of device 00:01.0 to 64
<7>PCI: Setting latency timer of device 00:02.0 to 64
<6>imq driver loaded.
<6>Universal TUN/TAP device driver 1.5 (C)1999-2002 Maxim Krasnyansky
<7>Physically mapped flash: Found an alias at 0x800000 for the chip at 0x0
<7>Physically mapped flash: Found an alias at 0x1000000 for the chip at 0x0
<7>Physically mapped flash: Found an alias at 0x1800000 for the chip at 0x0
<5>cfi_cmdset_0001: Erase suspend on write enabled
<7>0: offset=0x0,size=0x20000,blocks=64
<0>Using buffer write method
<5>Flash device: 0x800000 at 0x1c000000
<5>Physically mapped flash: squashfs filesystem found at block 823
<5>Creating 5 MTD partitions on "Physically mapped flash":
<5>0x00000000-0x00040000 : "pmon"
<5>0x00040000-0x007e0000 : "linux"
<5>0x000cde5c-0x0039682a : "rootfs"
<0>mtd: partition "rootfs" doesn't start on an erase block boundary -- force read-only
<5>0x007e0000-0x00800000 : "nvram"
<5>0x003a0000-0x007e0000 : "ddwrt"
<6>Initializing Cryptographic API
<6>IP Protocols: ICMP, UDP, TCP, IGMP
<6>IP: routing cache hash table of 512 buckets, 4Kbytes
<6>TCP: Hash tables configured (established 2048 bind 4096)
<0>ip_conntrack version 2.1 (512 buckets, 4096 max) - 336 bytes per conntrack
<0>ip_tables: (C) 2000-2002 Netfilter core team
<6>IPP2P v0.8.1_rc1 loading
<0>ipt_random match loaded
<0>netfilter PSD loaded - (c) astaro AG
<6>ipt_osf: Startng OS fingerprint matching module.
<0>ipt_IPV4OPTSSTRIP loaded
<0>ip_conntrack_rtsp v0.01 loading
<0>ip_nat_rtsp v0.01 loading
<6>NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
<6>802.1Q VLAN Support v1.8 Ben Greear <greearb@candelatech.com>
<6>All bugs added by David S. Miller <davem@redhat.com>
<0>VFS: Mounted root (squashfs filesystem) readonly.
<6>Mounted devfs on /dev
<6>diag boardtype: 0000042f
<7>PCI: Setting latency timer of device 01:01.0 to 64
<0>PCI: Enabling device 01:01.0 (0004 -> 0006)
<0>eth2: Broadcom BCM4318 802.11 Wireless Controller 3.90.39.0
<5>JFFS2 version 2.1. (C) 2001 Red Hat, Inc., designed by Axis Communications AB.
<6>device eth0 entered promiscuous mode
<6>device eth2 entered promiscuous mode
<6>usb.c: registered new driver usbdevfs
<6>usb.c: registered new driver hub
<0>PCI: Enabling device 01:02.2 (0000 -> 0002)
<6>ehci_hcd 01:02.2: PCI device 1033:00e0
<6>ehci_hcd 01:02.2: irq 2, pci mem c0181000
<6>usb.c: new USB bus registered, assigned bus number 1
<6>ehci_hcd 01:02.2: USB 2.0 enabled, EHCI 1.00, driver 2003-Dec-29/2.4
<6>hub.c: USB hub found
<6>hub.c: 5 ports detected
<6>hub.c: new USB device 01:02.2-1, assigned address 2
<4>usb.c: USB device 2 (vend/prod 0x781/0x5406) is not claimed by any active driver.
<6>SCSI subsystem driver Revision: 1.00
<6>Initializing USB Mass Storage driver...
<6>usb.c: registered new driver usb-storage
<6>scsi0 : SCSI emulation for USB Mass Storage devices
<0>  Vendor: SanDisk   Model: U3 Cruzer Micro   Rev: 2.18
<0>  Type:   Direct-Access                      ANSI SCSI revision: 02
<0>  Vendor: SanDisk   Model: U3 Cruzer Micro   Rev: 2.18
<0>  Type:   CD-ROM                             ANSI SCSI revision: 02
<7>WARNING: USB Mass Storage data integrity not assured
<7>USB Mass Storage device found at 2
<6>USB Mass Storage support registered.
<0>Attached scsi removable disk sda at scsi0, channel 0, id 0, lun 0
<0>SCSI device sda: 8015505 512-byte hdwr sectors (4104 MB)
<0>sda: Write Protect is off
<6>Partition check:
<6> /dev/scsi/host0/bus0/target0/lun0: p1 p2 p3
/ #

Create a startup script that loads the modules

Create a file, usb.startup in /jffs/etc/config/ directory

~ # mkdir /jffs/etc/config
~ # vi /jffs/etc/config/usb.startup

that contains this (press i once for insert mode):

#!/bin/sh
insmod /jffs/lib/modules/2.4.30/usbcore.o
insmod /jffs/lib/modules/2.4.30/ehci-hcd.o
insmod /jffs/lib/modules/2.4.30/scsi_mod.o
insmod /jffs/lib/modules/2.4.30/usb-storage.o
# remove the dash (#) from the line below if you use USB 1.1
#insmod /jffs/lib/modules/2.4.30/uhci.o
insmod /jffs/lib/modules/2.4.30/sd_mod.o

vi is ended using "ESC" and then :wq

make the script executable:

 chmod +x /jffs/etc/config/usb.startup

For DD-WRT v23 SP1 or below

add the follwing script to startup. It executes on every reboot all *.startup scripts located in /jffs/etc/config/

 console mode
 > ~ # nvram set rc_startup="
 > for I in `/bin/ls /jffs/etc/config/*.startup`
 > do
 >    sh $I &
 > done
 > "
 > ~ # nvram commit
 >
 web interface mode
 for I in `/bin/ls /jffs/etc/config/*.startup`
   do
     sh $I &
 done


This is it. Here's my dmesg from Asus WL-500gP

 dmesg
 SCSI subsystem driver Revision: 1.00
 Initializing USB Mass Storage driver...
 usb.c: registered new driver usb-storage
 USB Mass Storage support registered.
 uhci.c: USB Universal Host Controller Interface driver v1.1
 PCI: Enabling device 01:03.0 (0000 -> 0001)
 uhci.c: USB UHCI at I/O 0x100, IRQ 2
 usb.c: new USB bus registered, assigned bus number 2
 hub.c: USB hub found
 hub.c: 2 ports detected
 PCI: Enabling device 01:03.1 (0000 -> 0001)
 uhci.c: USB UHCI at I/O 0x120, IRQ 2
 usb.c: new USB bus registered, assigned bus number 3
 hub.c: USB hub found
 hub.c: 2 ports detected

kernel modules for filesystems

Now to access FAT/EXT/XFS partitions you must install

 ipkg install kmod-vfat
 ipkg install kmod-ext2
 ipkg install kmod-ext3
 ipkg install kmod-xfs

autoload filesystem modules

Add to /jffs/etc/config/usb.startup (comment out lines you don't need to save memory)

 # FAT
 insmod /jffs/lib/modules/2.4.30/fat.o
 insmod /jffs/lib/modules/2.4.30/vfat.o
 #XFS
 #insmod /jffs/lib/modules/2.4.30/xfs.o
 #EXT2
 #insmod /jffs/lib/modules/2.4.30/ext2.o
 #EXT2
 #insmod /jffs/lib/modules/2.4.30/ext3.o


Now dmesg should show (The example below is from a 80 GB HD)

 Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
 SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
 Partition check:
 /dev/scsi/host0/bus0/target0/lun0

Multislot card reader

In order to use a multislot card reader, you must add the following parameter to the scsi_mod in the file /jffs/etc/modules.d/60-usb-storage:

scsi_mod max_scsi_luns=8

Usage

Mounting

mount /dev/scsi/host0/bus0/target0/lun0/part1 /mnt

Performance Testing

With help of the hdparm package you could test your performance. On an Asus WL-500gP(remium) without overclocking you will get

hdparm -tT /dev/scsi/host0/bus0/target0/lun0/part2
Timing cached reads:   188 MB in  2.04 seconds =  92.16 MB/sec
Timing buffered disk reads:   24 MB in  3.19 seconds =   7.52 MB/sec


Please note overclocking wouldn´t get you significant more performance on Asus WL-500gP(remium) Router.

Listing Contents

ls -l /mnt

You can also add the above line to /jffs/etc/config/usb.startup to mount the partition on reboot

# multiple partitions
mkdir /tmp/usb
mkdir /tmp/usb/1
# wait to recognize devices properly
sleep 2
# mount first partition
/bin/mount /dev/scsi/host0/bus0/target0/lun0/part1 /tmp/usb/1
# list its contents
ls -l /tmp/usb/1
# second partition
mkdir /tmp/usb/2
mount /dev/scsi/host0/bus0/target0/lun0/part2 /tmp/usb/2
# list its contents
ls -l /tmp/usb/2