Board:lenovo/t520

Status

Issues

• yellow USB port isn't powered in power-off state.
• Discrete GPU not supported
• DisplayPort only connected to Discrete GPU
• TPM. At the moment there is only basic support inside coreboot...
• Windows hung while boot or reboots before start ( cdrom.sys )
• Boot time issues ( keyboard rest timeout )
• Brightness steps lacks ( changing very slow )
• no dmar (IOMMU)
• ultrabay hot plug (event missing?)
• some power management states missing

Tested

• Ultrabay SATA
• RAM module combinations of mrc: 4G+0, 0+4G, 8G+0, native: 4G+0, 8G+0
• USB ports
• Video (internal)
• ExpressCard slot (including hot-plugging)
• Gigabit LAN
• Mini-PCIe slot WLAN
• Linux (through SeaBIOS-as-payload)
• Trackpoint & Touchpad
• Fn hotkeys
• Thinklight
• Bluetooth
• SD card slot
• Sound (integrated speakers, integrated mic, external headphones, external mic)
• Fingerprint reader
• Docking tested with Lenovo ThinkPad Mini Dock Plus Series 3 USB 3.0 Type 4338
  • VGA
  • LAN
  • USB Hub
  • Line-in/out
  • DVI-D / DisplayPort not supported because it is connected to discrete graphics
• VGA output
• Suspend to Ram

Not tested

• Firewire
• eSATA
• USB WWAN
• Thermal management
• Webcam

Proprietary Components Status

• CPU Microcode
• FDT(Flash Descriptor Table) => Always needed
• 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)

Flashing

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

All Battery's and the Power-supply must be disconnected before flashing.

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).