mirror of
https://git.savannah.gnu.org/git/gnuboot.git
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Denis 'GNUtoo' Carikli
6e5e4f3421
Before being merged with the commitdc6e1f32c1("Import website-build to build the GNU Boot website."), website-build was a separate git repository. And so, even after the merge, until the commit20d122e94a("website-build: use website from local git repository."), it still worked in the same way and still downloaded the website from git. This prevented merging the website and website-build directories together as the GNU Boot repository also needed to be a valid Untitled website repository as well. Now after this commit, the website is built from the same git tree, so we can simply adjust the build scripts to be able to move things around. In addition of making things more clear for contributors, it also simplify the migration to haunt as with haunt we typically have the haunt.cfg (and the autotools build code if needed) code in the top directory and the markdown files in a subdirectory. Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org> Acked-by: Adrien 'neox' Bourmault <neox@gnu.org>
63 lines
2.3 KiB
Markdown
63 lines
2.3 KiB
Markdown
---
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title: ThinkPad T400
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x-unreviewed: true
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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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