Board:lenovo/t420s

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Revision as of 10:58, 23 November 2016 by Siro (talk | contribs)
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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

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

  • 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.