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Revision as of 18:38, 7 April 2018 by Nicorikken (talk | contribs) (Update with status table)
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The wiki is being retired!

Documentation is now handled by the same processes we use for code: Add something to the Documentation/ directory in the coreboot repo, and it will be rendered to Contributions welcome!


The W520 comes in 4 quad-core configurations, and 1 dual-core configuration. The quad-core configurations support RAM up to 32GB.

It is similar to the T520 model but supports more powerful CPU's and GPU's and has 4 RAM slots (32GB total). Compared to the superseding W530 model it notably features the conventional keyboard, an eSATA port, and full-size DisplayPort connector.

For more detailed specifications, please refer to the ThinkWiki


The W520 is implemented as a variant of the Board:lenovo/t520 and so it shares much of the same status.

Device/functionality Status Comments
CPU works OK Support both Sandy Bridge and Ivy Bridge
L1 cache enabled OK Always on
L2 cache enabled OK Always on
L3 cache enabled N/A
Multiple CPU support N/A
Multi-core support OK
Hardware virtualization OK
DDR3 OK Native
Dual channel support OK
ECC support N/A
On-board Hardware
On-board IDE 3.5" N/A
On-board IDE 2.5" N/A
On-board SATA OK
On-board SCSI N/A
On-board USB OK
On-board VGA No Same for DisplayPort. Requires ACPI call for GPU switch
On-board Ethernet OK
On-board Audio OK integrated speakers, integrated mic, external headphones, external mic
On-board Modem N/A
On-board FireWire Untested
On-board Smartcard reader Untested
On-board CompactFlash N/A
On-board PCMCIA OK
On-board Wifi OK
On-board Bluetooth Untested
On-board SD card reader OK
Add-on slots/cards
ISA add-on cards N/A
Audio/Modem-Riser (AMR/CNR) cards N/A
PCI add-on cards N/A
Mini-PCI add-on cards N/A
Mini-PCI-Express add-on cards Unknown
PCI-X add-on cards N/A
AGP graphics cards N/A
PCI Express x1 add-on cards N/A
PCI Express x2 add-on cards N/A
PCI Express x4 add-on cards N/A
PCI Express x8 add-on cards N/A
PCI Express x16 add-on cards OK
PCI Express x32 add-on cards N/A
HTX add-on cards N/A
Legacy / Super I/O
Floppy N/A
Serial port 1 (COM1) N/A
Serial port 2 (COM2) N/A
Parallel port N/A
PS/2 keyboard N/A
PS/2 mouse N/A
Game port N/A
Infrared N/A
PC speaker OK
DiskOnChip N/A
Trackpoint OK
Touchpad OK
Fn Hotkeys OK
Fingerprint Reader Untested
Docking VGA Untested
Docking LAN Untested
Docking USB Untested
Docking Audio Untested
Docking Displayport Untested
Thinklight OK
Webcam OK
Sensors / fan control OK
Hardware watchdog OK
CAN bus N/A
CPU frequency scaling OK
Other powersaving features N/A
ACPI Untested GPU switch missing
Reboot OK
Poweroff OK
Suspend OK Suspend to RAM
Nonstandard LEDs OK
High precision event timers (HPET) Untested
Random number generator (RNG) Untested
Wake on modem ring N/A
Wake on LAN Untested
Wake on keyboard Untested
Wake on mouse Untested
TPM Unknown
Flashrom OK ST/numonyx M25PX64VG 8 MiB VDFPN8 package.

Patch history

In November 2016 Charlotte Plusplus has made an initial attempt (mailinglist posts) based on the T520 firmware, with added romstage additions for ram init. This patch was committed in full to the mailing list, but not as a diff to the Gerrit infrastructure. In February 2018 Nico Rikken again customized the T520 firmware, and delivered a working patch set.

Proprietary components status

  • CPU Microcode (optional)
  • VGA Option ROM (optional): the native graphics initialization tested gave video artifacts in SeaBIOS. When using VGA Bios there were none.
  • ME(Management Engine) => you do not have to touch it (just leave it where it is). Also the stripped down T420 version can be re-used.
  • EC(Embedded Controller) => you do not have to touch it (just leave it where it is)

Known issues

  • The 2 USB 3.0 slots on the side are not working for boot media, just the USB 2.0 slot on the back.

Issues reported by Charlotte Plusplus

In 2016 some issues were reported. These need to be verified base on the most recent W520 patch.

  • Native VGA init is not working reliably (discussion thread).
  • The coreboot configuration consumes more power than the vendor BIOS does, so some additional settings might be required. (discussion thread).
  • No ACPI event when (dis)connecting the bay.


  • CPU (4 cores, 8 threads)
  • Suspend and resume
  • Ethernet port (GbE blob was put into place)
  • Speakers
  • Webcam (which is an internal USB-device)
  • 4 RAM-slots
  • Booting GNU Linux from USB using SeaBios
  • Speakers
  • PCIe Wifi
  • Fan
  • Touchpad, trackpoint and keyboard
  • Ethernet
  • Keyboard ACPI events


The location of the chip is similar to the T520:


When flashing with a Raspberry Pi no external power is needed. The 3V source from the GPIO is sufficient. The pins WP and HOLD can be left floating.

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