Board:lenovo/t520

Status

Issues:

• no MRC cache (longer boot time)
• yellow USB port isn't powered in power-off state.
• S3 (Suspend to RAM) - system powers off
• Discrete GPU not supported
• DisplayPort only connected to Discrete GPU
• TPM. At the moment there is only support a basic support inside coreboot...
• Windows hung while boot

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

Not tested:

• Firewire
• eSATA
• mSATA
• USB WWAN
• Thermal management
• Webcam
• Dock
• VGA output

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)

Code

{{ #if: | * [{{{review_url}}} The code has been merged into coreboot master]: | * The code has been merged into coreboot master:}}

 $ git clone https://review.coreboot.org/coreboot.git

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).