Board:lenovo/t520

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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 https://doc.coreboot.org/. Contributions welcome!

Status

Issues:

  • no MRC cache (longer boot time)
  • yellow USB port isn't powered in power-off state.
  • S3 (Suspend to RAM) - system switch off
  • discrete GPU
  • display port connected to discrete GPU
  • native RAM init fails training

Tested:

  • ultraabay sata
  • RAM module combinations of 4G+0, 0+4G
  • USB ports
  • Video (both internal and VGA)
  • Expresscard slot (including hotplugging)
  • LAN
  • mini-PCIe slot WLAN
  • Linux (through SeaBIOS-as-payload)
  • trackpoint
  • Fn hotkeys
  • Thinklight
  • bluetooth
  • SD card slot
  • Sound (integrated speakers, integrated mic, external headphones, external mic)

Not tested:

  • firewire
  • eSATA
  • msata
  • usb wwan slot
  • Thermal management
  • Fingerprint reader
  • Webcam
  • touchpad
  • dock


proprietary components status

  • CPU Microcode
  • VGA option ROM (optional): you need it if you want graphics in SeaBIOS but most payloads should work without it (text mode or corebootfb mode)
  • ME(Management Engine) => you do not have to touch it(just leave it where it is)
  • GbE(Gigabit Ethernet embedded mac) => you do not have to touch it(just leave it where it is)

Code

  • The code has been merged into coreboot master
 $ git clone http://review.coreboot.org/p/coreboot

Flashing

T520 has a ST / numonyx M25PX64VG 8 MiB flash chip in a VDFPN8 package.

Next to the flash chip is a connector solder place "J100" where it is connected to.

1 N/C
2 N/C
3 /CS
4 VCC
5 MISO
6 /HOLD
7 /WP
8 CLK
9 GND
10 MOSI

Flash layout: FLREG0: 0x00000000

 Flash Region 0 (Flash Descriptor): 00000000 - 00000fff 

FLREG1: 0x07ff0500

 Flash Region 1 (BIOS): 00500000 - 007fffff 

FLREG2: 0x04ff0003

 Flash Region 2 (Intel ME): 00003000 - 004fffff 

FLREG3: 0x00020001

 Flash Region 3 (GbE): 00001000 - 00002fff 

FLREG4: 0x00000fff

 Flash Region 4 (Platform Data): 00fff000 - 00000fff (unused)


Vendor firmware locks the flash and so you need to flash externally (unless until someone figures out a way around it).