ThinkPad R400


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It is believed that all or most R400 laptops are compatible. See notes about CPU compatibility for potential incompatibilities.

There are two possible flash chip sizes for the R400: 4MiB (32Mbit) or 8MiB (64Mbit). This can be identified by the type of flash chip below the palmrest: 4MiB is SOIC-8, 8MiB is SOIC-16.

The R400 laptops come with the ME (and sometimes AMT in addition) before flashing osboot. osboot disables and removes it by using a modified descriptor: see ../install/ich9utils.html (contains notes, plus instructions)

Flashing instructions can be found at ../install/#flashrom

EC update

It is recommended that you update to the latest EC firmware version. The EC firmware is separate from osboot, so we don’t actually provide that, but if you still have Lenovo BIOS then you can just run the Lenovo BIOS update utility, which will update both the BIOS and EC version. See:

NOTE: this can only be done when you are using Lenovo BIOS. How to update the EC firmware while running osboot is unknown. osboot only replaces the BIOS firmware, not EC.

Updated EC firmware has several advantages e.g. bettery battery handling.

The R400 is almost identical to the X200, code-wise. See x200.html.

TODO: put hardware register logs here like on the X200 and T400 page.

Markdown file for this page: https://osboot.org/docs/hardware/r400.md

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