Board:lenovo/t420s

Status

Intel_Native_Raminit has it's own status page.

Issues:

• yellow USB port isn't powered in power-off state.
• Discrete GPU not supported - wip
• for i7 / Discrete GPU model - DisplayPort only connected to Discrete GPU -> does not work
• TPM - missing acpi
• Boot time issues after reboot (keyboard rest timeout)
• ultrabay hot plug (event missing?)
• some power management states missing?
• windows not supported

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

Building Firmware

Please have a look at Intel_Sandybridge_Build_Tutorial.

Flashing

The flash chip can be a 8MB SOIC8 (Macronix MX25L6436EM2I / MX25L6406EM2I / Winbond W25Q64CVS) or WSON8 (Numonyx M25PX64).

Vendor firmware locks the flash and so you need to flash externally (unless until someone figures out a way around it). Lenovo firmware uses "protected regions" to protect the bootblock.