2021-05-18 14:21:48 +02:00
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---
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title: ThinkPad T400
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2023-12-06 20:41:16 +01:00
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x-unreviewed: true
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2021-05-18 14:21:48 +02:00
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...
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Introduction
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============
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It is believed that all or most laptops of the model T400 are compatible. See notes
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about [CPU
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compatibility](../install/t400_external.html#cpu_compatibility) for
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potential incompatibilities.
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There are two possible flash chip sizes for the T400: 4MiB (32Mbit) or
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8MiB (64Mbit). This can be identified by the type of flash chip below
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the palmrest: 4MiB is SOIC-8, 8MiB is SOIC-16.
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*The T400 laptops come with the ME (and sometimes AMT in addition)
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before flashing libreboot. Libreboot disables and removes it by using a
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modified descriptor: see [../install/ich9utils.md](../install/ich9utils.md)*
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(contains notes, plus instructions)
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Flashing instructions can be found at
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[../install/\#flashrom](../install/#flashrom)
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EC update {#ecupdate}
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=========
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It is recommended that you update to the latest EC firmware version. The
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[EC firmware](../../faq.md#ec-embedded-controller-firmware) is separate from
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libreboot, so we don't actually provide that, but if you still have
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Lenovo BIOS then you can just run the Lenovo BIOS update utility, which
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will update both the BIOS and EC version. See:
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- [../install/#flashrom](../install/#flashrom)
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- <http://www.thinkwiki.org/wiki/BIOS_update_without_optical_disk>
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NOTE: this can only be done when you are using Lenovo BIOS. How to
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update the EC firmware while running libreboot is unknown. Libreboot
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only replaces the BIOS firmware, not EC.
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Updated EC firmware has several advantages e.g. bettery battery
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handling.
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Compatibility (without blobs) {#compatibility_noblobs}
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-----------------------------
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### Hardware virtualization (vt-x) {#hwvirt}
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The T400, when run without CPU microcode updates in coreboot, currently
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kernel panics if running QEMU with vt-x enabled on 2 cores for the
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guest. With a single core enabled for the guest, the guest panics (but
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the host is fine). Working around this in QEMU might be possible; if
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not, software virtualization should work fine (it's just slower).
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On GM45 hardware (with libreboot), make sure that the *kvm* and
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*kvm\_intel* kernel modules are not loaded, when using QEMU.
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The following errata datasheet from Intel might help with investigation:
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<http://download.intel.com/design/mobile/specupdt/320121.pdf>
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The T400 is almost identical to the X200, code-wise. See
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[x200.md](x200.md).
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