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+---
+title: ThinkPad T400 
+...
+
+It is believed that all or most laptops of the model T400 are compatible. See notes
+about [CPU
+compatibility](../install/t400_external.html#cpu_compatibility) for
+potential incompatibilities.
+
+There are two possible flash chip sizes for the T400: 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 T400 laptops come with the ME (and sometimes AMT in addition)
+before flashing libreboot. Libreboot disables and removes it by using a
+modified descriptor: see [gm45\_remove\_me.md](gm45_remove_me.md)*
+(contains notes, plus instructions)
+
+Flashing instructions can be found at
+[../install/\#flashrom](../install/#flashrom)
+
+EC update {#ecupdate}
+=========
+
+It is recommended that you update to the latest EC firmware version. The
+[EC firmware](../../faq.md#ec-embedded-controller-firmware) is separate from
+libreboot, 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:
+
+-   [../install/#flashrom](../install/#flashrom)
+-   <http://www.thinkwiki.org/wiki/BIOS_update_without_optical_disk>
+
+NOTE: this can only be done when you are using Lenovo BIOS. How to
+update the EC firmware while running libreboot is unknown. Libreboot
+only replaces the BIOS firmware, not EC.
+
+Updated EC firmware has several advantages e.g. bettery battery
+handling.
+
+Compatibility (without blobs) {#compatibility_noblobs}
+-----------------------------
+
+### Hardware virtualization (vt-x) {#hwvirt}
+
+The T400, when run without CPU microcode updates in coreboot, currently
+kernel panics if running QEMU with vt-x enabled on 2 cores for the
+guest. With a single core enabled for the guest, the guest panics (but
+the host is fine). Working around this in QEMU might be possible; if
+not, software virtualization should work fine (it's just slower).
+
+On GM45 hardware (with libreboot), make sure that the *kvm* and
+*kvm\_intel* kernel modules are not loaded, when using QEMU.
+
+The following errata datasheet from Intel might help with investigation:
+<http://download.intel.com/design/mobile/specupdt/320121.pdf>
+
+The T400 is almost identical to the X200, code-wise. See
+[x200.md](x200.md).
+
+Hardware register dumps {#regdumps}
+-----------------------
+
+The coreboot wiki
+[shows](http://www.coreboot.org/Motherboard_Porting_Guide) how to
+collect various logs useful in porting to new boards. Following are
+outputs from the T400:
+
+-   T400 with *Winbond W25X64* flash chip (8MiB, SOIC-16) and Lenovo
+    BIOS 2.02 (EC firmware 1.01):
+    -   [../future/dumps/logs-t400-bios2.02-ec1.01/](../future/dumps/logs-t400-bios2.02-ec1.01/)
+
+-   Version of flashrom used for the external flashing/reading logs is
+    the one that libreboot git revision c164960 uses.
+
+Copyright © 2015 Leah Rowe <info@minifree.org>\
+
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License Version 1.3 or any later
+version published by the Free Software Foundation
+with no Invariant Sections, no Front Cover Texts, and no Back Cover Texts.
+A copy of this license is found in [../fdl-1.3.md](../fdl-1.3.md)