#5336 BLOC Update.: Libertas WLAN doesn't start at boot

Zarro Boogs per Child bugtracker at laptop.org
Wed Dec 5 12:12:28 EST 2007


#5336: Libertas WLAN doesn't start at boot
-----------------------+----------------------------------------------------
  Reporter:  wad       |       Owner:  mbletsas                     
      Type:  defect    |      Status:  new                          
  Priority:  blocker   |   Milestone:  Update.2                     
 Component:  wireless  |     Version:                               
Resolution:            |    Keywords:  WLAN, libertas, school server
  Verified:  0         |  
-----------------------+----------------------------------------------------
Changes (by jg):

 * cc: jcardona (added)
  * owner:  jg => mbletsas
  * component:  distro => wireless
  * milestone:  Never Assigned => Update.2


Old description:

> When using an Active Antenna on a school server, and the latest libertas
> driver (built by dwmw2 for the 2.6.23.1-21.fc7 kernel), the active
> antenna is never succesfully initialized on power-up.
>
> To avoid problems with already loaded firmware (#5308, #5247), the
> servers were being powered down and powered back up, not rebooted.
>
> This has been verified on multiple motherboards (Via, MSI).  The driver
> finds and initializes the antenna OK when the antenna is unplugged and
> plugged back in.
>
> Possibly a duplicate of #4632, but using a much newer driver.
>
> #5203 reports similar symptoms on a laptop, but only occasionally (not
> consistently like #4632 and this case).
>
> The relevant dmesg output is:
>  uhci_hcd 0000:00:10.0: UHCI Host Controller
>  uhci_hcd 0000:00:10.0: new USB bus registered, assigned bus number 1
>  uhci_hcd 0000:00:10.0: irq 10, io base 0x0000e000
>  usb usb1: configuration #1 chosen from 1 choice
>  hub 1-0:1.0: USB hub found
>  hub 1-0:1.0: 2 ports detected
>  ACPI: PCI Interrupt 0000:00:10.1[A] -> Link [LNKA] -> GSI 10 (level,
> low) -> IRQ 10
>  uhci_hcd 0000:00:10.1: UHCI Host Controller
>  uhci_hcd 0000:00:10.1: new USB bus registered, assigned bus number 2
>  uhci_hcd 0000:00:10.1: irq 10, io base 0x0000dc00
>  usb usb2: configuration #1 chosen from 1 choice
>  hub 2-0:1.0: USB hub found
>  hub 2-0:1.0: 2 ports detected
>  ACPI: PCI Interrupt Link [LNKB] enabled at IRQ 11
>  PCI: setting IRQ 11 as level-triggered
>  ACPI: PCI Interrupt 0000:00:10.2[B] -> Link [LNKB] -> GSI 11 (level,
> low) -> IRQ 11
>  uhci_hcd 0000:00:10.2: UHCI Host Controller
>  uhci_hcd 0000:00:10.2: new USB bus registered, assigned bus number 3
>  uhci_hcd 0000:00:10.2: irq 11, io base 0x0000d800
>  usb usb3: configuration #1 chosen from 1 choice
>  hub 3-0:1.0: USB hub found
>  hub 3-0:1.0: 2 ports detected
>  Clocksource tsc unstable (delta = -177851069 ns)
>  ACPI: PCI Interrupt 0000:00:10.3[B] -> Link [LNKB] -> GSI 11 (level,
> low) -> IRQ 11
>  uhci_hcd 0000:00:10.3: UHCI Host Controller
>  uhci_hcd 0000:00:10.3: new USB bus registered, assigned bus number 4
>  uhci_hcd 0000:00:10.3: irq 11, io base 0x0000d400
>  usb usb4: configuration #1 chosen from 1 choice
>  hub 4-0:1.0: USB hub found
>  hub 4-0:1.0: 2 ports detected
>  usb 1-2: new full speed USB device using uhci_hcd and address 2
>  ohci_hcd: 2006 August 04 USB 1.1 'Open' Host Controller (OHCI) Driver
>  ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 11
>  ACPI: PCI Interrupt 0000:00:10.4[C] -> Link [LNKC] -> GSI 11 (level,
> low) -> IRQ 11
>  PCI: VIA VLink IRQ fixup for 0000:00:10.4, from 5 to 11
>  ehci_hcd 0000:00:10.4: EHCI Host Controller
>  ehci_hcd 0000:00:10.4: new USB bus registered, assigned bus number 5
>  ehci_hcd 0000:00:10.4: irq 11, io mem 0xfdfff000
>  ehci_hcd 0000:00:10.4: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
>  usb usb5: configuration #1 chosen from 1 choice
>  hub 5-0:1.0: USB hub found
>  hub 5-0:1.0: 8 ports detected
>  SCSI subsystem initialized
>  libata version 2.21 loaded.
>  sata_via 0000:00:0f.0: version 2.3
>  ACPI: PCI Interrupt 0000:00:0f.0[B] -> Link [LNKB] -> GSI 11 (level,
> low) -> IRQ 11
>  sata_via 0000:00:0f.0: routed to hard irq line 11
>  scsi0 : sata_via
>  scsi1 : sata_via
>  ata1: SATA max UDMA/133 cmd 0x0001fc00 ctl 0x0001f802 bmdma 0x0001ec00
> irq 11
>  ata2: SATA max UDMA/133 cmd 0x0001f400 ctl 0x0001f002 bmdma 0x0001ec08
> irq 11
>  ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
>  ata1.00: ATA-8: SAMSUNG HD403LJ, CT100-10, max UDMA7
>  ata1.00: 781422768 sectors, multi 16: LBA48 NCQ (depth 0/32)
>  ata1.00: configured for UDMA/133
>  ata2: SATA link down 1.5 Gbps (SStatus 0 SControl 300)
>  usb 5-2: new high speed USB device using ehci_hcd and address 2
>  scsi 0:0:0:0: Direct-Access     ATA      SAMSUNG HD403LJ  CT10 PQ: 0
> ANSI: 5
>  sd 0:0:0:0: [sda] 781422768 512-byte hardware sectors (400088 MB)
>  sd 0:0:0:0: [sda] Write Protect is off
>  sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
>  sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't
> support DPO or FUA
>  sd 0:0:0:0: [sda] 781422768 512-byte hardware sectors (400088 MB)
>  sd 0:0:0:0: [sda] Write Protect is off
>  sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
>  sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't
> support DPO or FUA
>  sda: sda1 sda2 sda3
>  sd 0:0:0:0: [sda] Attached SCSI disk
>  usb 5-2: configuration #1 chosen from 1 choice
>  usb 3-2: new low speed USB device using uhci_hcd and address 2
>  usb 3-2: configuration #1 chosen from 1 choice
>  input: Logitech Optical USB Mouse as /class/input/input2
>  input: USB HID v1.10 Mouse [Logitech Optical USB Mouse] on
> usb-0000:00:10.2-2
>  device-mapper: ioctl: 4.11.0-ioctl (2006-10-12) initialised:  dm-
> devel at redhat.com
>  kjournald starting.  Commit interval 5 seconds
>  EXT3-fs: mounted filesystem with ordered data mode.
>  sd 0:0:0:0: Attached scsi generic sg0 type 0
>  pata_via 0000:00:0f.1: version 0.3.2
>  ACPI: PCI Interrupt 0000:00:0f.1[A] -> Link [LNKA] -> GSI 10 (level,
> low) -> IRQ 10
>  PCI: VIA VLink IRQ fixup for 0000:00:0f.1, from 255 to 10
>  scsi2 : pata_via
>  scsi3 : pata_via
>  ata3: PATA max UDMA/133 cmd 0x000101f0 ctl 0x000103f6 bmdma 0x0001e400
> irq 14
>  ata4: PATA max UDMA/133 cmd 0x00010170 ctl 0x00010376 bmdma 0x0001e408
> irq 15
>  ieee80211_crypt: registered algorithm 'NULL'
>  ieee80211: 802.11 data/management/control stack, git-1.1.13
>  ieee80211: Copyright (C) 2004-2005 Intel Corporation
> <jketreno at linux.intel.com>
>  input: Power Button (FF) as /class/input/input3
>  ACPI: Power Button (FF) [PWRF]
>  input: Power Button (CM) as /class/input/input4
>  ACPI: Power Button (CM) [PWRB]
>  input: Sleep Button (CM) as /class/input/input5
>  ACPI: Sleep Button (CM) [SLPB]
>  via-rhine.c:v1.10-LK1.4.3 2007-03-06 Written by Donald Becker
>  via-rhine: Broken BIOS detected, avoid_D3 enabled.
>  ACPI: PCI Interrupt 0000:00:12.0[A] -> Link [LNKA] -> GSI 10 (level,
> low) -> IRQ 10
>  eth0: VIA Rhine II at 0xfdffe000, 00:40:63:e8:3f:3e, IRQ 10.
>  eth0: MII PHY found at address 1, status 0x786d advertising 05e1 Link
> cde1.
>  parport_pc 00:09: reported by Plug and Play ACPI
>  parport0: PC-style at 0x378, irq 7 [PCSPP,TRISTATE,EPP]
>  usb8xxx: URB in failure status: -71
>  ACPI: PCI Interrupt 0000:00:11.5[C] -> Link [LNKC] -> GSI 11 (level,
> low) -> IRQ 11
>  PCI: VIA VLink IRQ fixup for 0000:00:11.5, from 5 to 11
>  PCI: Setting latency timer of device 0000:00:11.5 to 64
>  usb8xxx: URB in failure status: -71
>  usb8xxx: URB in failure status: -71
>  usb8xxx: URB in failure status: -71
>  usb8xxx: URB in failure status: -71
>  usb 5-2: reset high speed USB device using ehci_hcd and address 2
>  usb 5-2: reset high speed USB device using ehci_hcd and address 2
>  usb8xxx: URB in failure status: -71
>  usb 5-2: reset high speed USB device using ehci_hcd and address 2
>  usb8xxx: URB in failure status: -71
>  usb 5-2: reset high speed USB device using ehci_hcd and address 2
>  usb8xxx: URB in failure status: -71
>  usb 5-2: reset high speed USB device using ehci_hcd and address 2
>  usb8xxx: URB in failure status: -71
>  usb 5-2: reset high speed USB device using ehci_hcd and address 2
>  usb8xxx: URB in failure status: -71
>  usb 5-2: reset high speed USB device using ehci_hcd and address 2
>  usb8xxx: URB in failure status: -71
>  usb 5-2: reset high speed USB device using ehci_hcd and address 2
>  usb8xxx: URB in failure status: -71
>  usb 5-2: reset high speed USB device using ehci_hcd and address 2
>  usb8xxx: URB in failure status: -71
>  usb 5-2: reset high speed USB device using ehci_hcd and address 2
>  usb8xxx: URB in failure status: -71
>  libertas: firmware init failed
>  usb8xxx: probe of 5-2:1.0 failed with error -12
>  usbcore: registered new interface driver usb8xxx
>  Floppy drive(s): fd0 is unknown type 15 (usb?), fd1 is unknown type 15
> (usb?)
>  device-mapper: multipath: version 1.0.5 loaded
>  EXT3 FS on sda2, internal journal
>  kjournald starting.  Commit interval 5 seconds
>  EXT3 FS on sda1, internal journal
>  EXT3-fs: mounted filesystem with ordered data mode.
>  kjournald starting.  Commit interval 5 seconds
>  EXT3 FS on dm-1, internal journal
>  EXT3-fs: mounted filesystem with ordered data mode .
>  Adding 2097144k swap on /dev/VolGroup00/LogVol01.
>  Priority:-1 extents:1 across:2097144k
>  floppy0: no floppy controllers found
>  NET: Registered protocol family 10
>  lo: Disabled Privacy Extensions
>  ip6_tables: (C) 2000-2006 Netfilter Core Team
>  ip_tables: (C) 2000-2006 Netfilter Core Team
>  Netfilter messages via NETLINK v0.30.
>  nf_conntrack version 0.5.0 (15360 buckets, 61440 max)
>  eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1
>  dummy0: no IPv6 routers present
>  usb 5-2: USB disconnect, address 2
>  usb 5-2: new high speed USB device using ehci_hcd and address 4
>  usb 5-2: configuration #1 chosen from 1 choice
>  libertas: eth1: Marvell WLAN 802.11 adapter
>  ADDRCONF(NETDEV_UP): eth1: link is not ready
>  ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
>
> At the end of this dmesg log, you can see the messages generated when I
> unplugged the active antenna and plugged it back in.  The driver does
> find and initialize the device.

New description:

 When using an Active Antenna on a school server, and the latest libertas
 driver (built by dwmw2 for the 2.6.23.1-21.fc7 kernel), the active antenna
 is never successfully initialized on power-up.

 To avoid problems with already loaded firmware (#5308, #5247), the servers
 were being powered down and powered back up, not rebooted.

 This has been verified on multiple motherboards (Via, MSI).  The driver
 finds and initializes the antenna OK when the antenna is unplugged and
 plugged back in.

 Possibly a duplicate of #4632, but using a much newer driver.

 #5203 reports similar symptoms on a laptop, but only occasionally (not
 consistently like #4632 and this case).

 The relevant dmesg output is:
  uhci_hcd 0000:00:10.0: UHCI Host Controller
  uhci_hcd 0000:00:10.0: new USB bus registered, assigned bus number 1
  uhci_hcd 0000:00:10.0: irq 10, io base 0x0000e000
  usb usb1: configuration #1 chosen from 1 choice
  hub 1-0:1.0: USB hub found
  hub 1-0:1.0: 2 ports detected
  ACPI: PCI Interrupt 0000:00:10.1[A] -> Link [LNKA] -> GSI 10 (level, low)
 -> IRQ 10
  uhci_hcd 0000:00:10.1: UHCI Host Controller
  uhci_hcd 0000:00:10.1: new USB bus registered, assigned bus number 2
  uhci_hcd 0000:00:10.1: irq 10, io base 0x0000dc00
  usb usb2: configuration #1 chosen from 1 choice
  hub 2-0:1.0: USB hub found
  hub 2-0:1.0: 2 ports detected
  ACPI: PCI Interrupt Link [LNKB] enabled at IRQ 11
  PCI: setting IRQ 11 as level-triggered
  ACPI: PCI Interrupt 0000:00:10.2[B] -> Link [LNKB] -> GSI 11 (level, low)
 -> IRQ 11
  uhci_hcd 0000:00:10.2: UHCI Host Controller
  uhci_hcd 0000:00:10.2: new USB bus registered, assigned bus number 3
  uhci_hcd 0000:00:10.2: irq 11, io base 0x0000d800
  usb usb3: configuration #1 chosen from 1 choice
  hub 3-0:1.0: USB hub found
  hub 3-0:1.0: 2 ports detected
  Clocksource tsc unstable (delta = -177851069 ns)
  ACPI: PCI Interrupt 0000:00:10.3[B] -> Link [LNKB] -> GSI 11 (level, low)
 -> IRQ 11
  uhci_hcd 0000:00:10.3: UHCI Host Controller
  uhci_hcd 0000:00:10.3: new USB bus registered, assigned bus number 4
  uhci_hcd 0000:00:10.3: irq 11, io base 0x0000d400
  usb usb4: configuration #1 chosen from 1 choice
  hub 4-0:1.0: USB hub found
  hub 4-0:1.0: 2 ports detected
  usb 1-2: new full speed USB device using uhci_hcd and address 2
  ohci_hcd: 2006 August 04 USB 1.1 'Open' Host Controller (OHCI) Driver
  ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 11
  ACPI: PCI Interrupt 0000:00:10.4[C] -> Link [LNKC] -> GSI 11 (level, low)
 -> IRQ 11
  PCI: VIA VLink IRQ fixup for 0000:00:10.4, from 5 to 11
  ehci_hcd 0000:00:10.4: EHCI Host Controller
  ehci_hcd 0000:00:10.4: new USB bus registered, assigned bus number 5
  ehci_hcd 0000:00:10.4: irq 11, io mem 0xfdfff000
  ehci_hcd 0000:00:10.4: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
  usb usb5: configuration #1 chosen from 1 choice
  hub 5-0:1.0: USB hub found
  hub 5-0:1.0: 8 ports detected
  SCSI subsystem initialized
  libata version 2.21 loaded.
  sata_via 0000:00:0f.0: version 2.3
  ACPI: PCI Interrupt 0000:00:0f.0[B] -> Link [LNKB] -> GSI 11 (level, low)
 -> IRQ 11
  sata_via 0000:00:0f.0: routed to hard irq line 11
  scsi0 : sata_via
  scsi1 : sata_via
  ata1: SATA max UDMA/133 cmd 0x0001fc00 ctl 0x0001f802 bmdma 0x0001ec00
 irq 11
  ata2: SATA max UDMA/133 cmd 0x0001f400 ctl 0x0001f002 bmdma 0x0001ec08
 irq 11
  ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
  ata1.00: ATA-8: SAMSUNG HD403LJ, CT100-10, max UDMA7
  ata1.00: 781422768 sectors, multi 16: LBA48 NCQ (depth 0/32)
  ata1.00: configured for UDMA/133
  ata2: SATA link down 1.5 Gbps (SStatus 0 SControl 300)
  usb 5-2: new high speed USB device using ehci_hcd and address 2
  scsi 0:0:0:0: Direct-Access     ATA      SAMSUNG HD403LJ  CT10 PQ: 0
 ANSI: 5
  sd 0:0:0:0: [sda] 781422768 512-byte hardware sectors (400088 MB)
  sd 0:0:0:0: [sda] Write Protect is off
  sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
  sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't
 support DPO or FUA
  sd 0:0:0:0: [sda] 781422768 512-byte hardware sectors (400088 MB)
  sd 0:0:0:0: [sda] Write Protect is off
  sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
  sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't
 support DPO or FUA
  sda: sda1 sda2 sda3
  sd 0:0:0:0: [sda] Attached SCSI disk
  usb 5-2: configuration #1 chosen from 1 choice
  usb 3-2: new low speed USB device using uhci_hcd and address 2
  usb 3-2: configuration #1 chosen from 1 choice
  input: Logitech Optical USB Mouse as /class/input/input2
  input: USB HID v1.10 Mouse [Logitech Optical USB Mouse] on
 usb-0000:00:10.2-2
  device-mapper: ioctl: 4.11.0-ioctl (2006-10-12) initialised:  dm-
 devel at redhat.com
  kjournald starting.  Commit interval 5 seconds
  EXT3-fs: mounted filesystem with ordered data mode.
  sd 0:0:0:0: Attached scsi generic sg0 type 0
  pata_via 0000:00:0f.1: version 0.3.2
  ACPI: PCI Interrupt 0000:00:0f.1[A] -> Link [LNKA] -> GSI 10 (level, low)
 -> IRQ 10
  PCI: VIA VLink IRQ fixup for 0000:00:0f.1, from 255 to 10
  scsi2 : pata_via
  scsi3 : pata_via
  ata3: PATA max UDMA/133 cmd 0x000101f0 ctl 0x000103f6 bmdma 0x0001e400
 irq 14
  ata4: PATA max UDMA/133 cmd 0x00010170 ctl 0x00010376 bmdma 0x0001e408
 irq 15
  ieee80211_crypt: registered algorithm 'NULL'
  ieee80211: 802.11 data/management/control stack, git-1.1.13
  ieee80211: Copyright (C) 2004-2005 Intel Corporation
 <jketreno at linux.intel.com>
  input: Power Button (FF) as /class/input/input3
  ACPI: Power Button (FF) [PWRF]
  input: Power Button (CM) as /class/input/input4
  ACPI: Power Button (CM) [PWRB]
  input: Sleep Button (CM) as /class/input/input5
  ACPI: Sleep Button (CM) [SLPB]
  via-rhine.c:v1.10-LK1.4.3 2007-03-06 Written by Donald Becker
  via-rhine: Broken BIOS detected, avoid_D3 enabled.
  ACPI: PCI Interrupt 0000:00:12.0[A] -> Link [LNKA] -> GSI 10 (level, low)
 -> IRQ 10
  eth0: VIA Rhine II at 0xfdffe000, 00:40:63:e8:3f:3e, IRQ 10.
  eth0: MII PHY found at address 1, status 0x786d advertising 05e1 Link
 cde1.
  parport_pc 00:09: reported by Plug and Play ACPI
  parport0: PC-style at 0x378, irq 7 [PCSPP,TRISTATE,EPP]
  usb8xxx: URB in failure status: -71
  ACPI: PCI Interrupt 0000:00:11.5[C] -> Link [LNKC] -> GSI 11 (level,
 low) -> IRQ 11
  PCI: VIA VLink IRQ fixup for 0000:00:11.5, from 5 to 11
  PCI: Setting latency timer of device 0000:00:11.5 to 64
  usb8xxx: URB in failure status: -71
  usb8xxx: URB in failure status: -71
  usb8xxx: URB in failure status: -71
  usb8xxx: URB in failure status: -71
  usb 5-2: reset high speed USB device using ehci_hcd and address 2
  usb 5-2: reset high speed USB device using ehci_hcd and address 2
  usb8xxx: URB in failure status: -71
  usb 5-2: reset high speed USB device using ehci_hcd and address 2
  usb8xxx: URB in failure status: -71
  usb 5-2: reset high speed USB device using ehci_hcd and address 2
  usb8xxx: URB in failure status: -71
  usb 5-2: reset high speed USB device using ehci_hcd and address 2
  usb8xxx: URB in failure status: -71
  usb 5-2: reset high speed USB device using ehci_hcd and address 2
  usb8xxx: URB in failure status: -71
  usb 5-2: reset high speed USB device using ehci_hcd and address 2
  usb8xxx: URB in failure status: -71
  usb 5-2: reset high speed USB device using ehci_hcd and address 2
  usb8xxx: URB in failure status: -71
  usb 5-2: reset high speed USB device using ehci_hcd and address 2
  usb8xxx: URB in failure status: -71
  usb 5-2: reset high speed USB device using ehci_hcd and address 2
  usb8xxx: URB in failure status: -71
  libertas: firmware init failed
  usb8xxx: probe of 5-2:1.0 failed with error -12
  usbcore: registered new interface driver usb8xxx
  Floppy drive(s): fd0 is unknown type 15 (usb?), fd1 is unknown type 15
 (usb?)
  device-mapper: multipath: version 1.0.5 loaded
  EXT3 FS on sda2, internal journal
  kjournald starting.  Commit interval 5 seconds
  EXT3 FS on sda1, internal journal
  EXT3-fs: mounted filesystem with ordered data mode.
  kjournald starting.  Commit interval 5 seconds
  EXT3 FS on dm-1, internal journal
  EXT3-fs: mounted filesystem with ordered data mode .
  Adding 2097144k swap on /dev/VolGroup00/LogVol01.
  Priority:-1 extents:1 across:2097144k
  floppy0: no floppy controllers found
  NET: Registered protocol family 10
  lo: Disabled Privacy Extensions
  ip6_tables: (C) 2000-2006 Netfilter Core Team
  ip_tables: (C) 2000-2006 Netfilter Core Team
  Netfilter messages via NETLINK v0.30.
  nf_conntrack version 0.5.0 (15360 buckets, 61440 max)
  eth0: link up, 100Mbps, full-duplex, lpa 0xCDE1
  dummy0: no IPv6 routers present
  usb 5-2: USB disconnect, address 2
  usb 5-2: new high speed USB device using ehci_hcd and address 4
  usb 5-2: configuration #1 chosen from 1 choice
  libertas: eth1: Marvell WLAN 802.11 adapter
  ADDRCONF(NETDEV_UP): eth1: link is not ready
  ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready

 At the end of this dmesg log, you can see the messages generated when I
 unplugged the active antenna and plugged it back in.  The driver does find
 and initialize the device.

--

-- 
Ticket URL: <http://dev.laptop.org/ticket/5336#comment:1>
One Laptop Per Child <http://dev.laptop.org>
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