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\input texinfo
@documentencoding UTF-8
@ifnottex
@paragraphindent 0
@end ifnottex
@titlepage
@title ThinkPad R400
@end titlepage
@node Top
@top ThinkPad R400
@menu
* ThinkPad R400::
* LCD compatibly::
@end menu
@node ThinkPad R400
@chapter ThinkPad R400
@anchor{#thinkpad-r400}
It is believed that all or most R400 laptops are compatible. See notes about @uref{../install/r400_external.html#cpu_compatibility,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.
@strong{The R400 laptops come with the ME (and sometimes AMT in addition) before flashing libreboot. Libreboot disables and removes it by using a modified descriptor: see @uref{gm45_remove_me.html,gm45_remove_me.html}} (contains notes, plus instructions)
Flashing instructions can be found at @uref{../install/index.html#flashrom,../install/index.html#flashrom}
@uref{index.html,Back to previous index}.
@menu
* Compatibility without blobs::
@end menu
@node Compatibility without blobs
@section Compatibility (without blobs)
@anchor{#compatibility-without-blobs}
@menu
* Hardware virtualization vt-x::
@end menu
@node Hardware virtualization vt-x
@subsection Hardware virtualization (vt-x)
@anchor{#hardware-virtualization-vt-x}
The R400, 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 @emph{kvm} and @emph{kvm_intel} kernel modules are not loaded, when using QEMU.
The following errata datasheet from Intel might help with investigation: @uref{http://download.intel.com/design/mobile/specupdt/320121.pdf,http://download.intel.com/design/mobile/specupdt/320121.pdf}
The R400 is almost identical to the X200, code-wise. See @uref{x200.html,x200.html}.
TODO: put hardware register logs here like on the @uref{x200.html,X200} and @uref{t400.html,T400} page.
@node LCD compatibly
@chapter LCD compatibly
@anchor{#lcd-compatibly}
Not all LCD panels are compatible yet. See @uref{gm45_lcd.html,gm45_lcd.html}.
Copyright © 2014, 2015 Minifree Ltd <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 the license can be found at @uref{../resources/licenses/gfdl-1.3.txt,gfdl-1.3.txt}
Updated versions of the license (when available) can be found at @uref{https://www.gnu.org/licenses/licenses.html,https://www.gnu.org/licenses/licenses.html}
UNLESS OTHERWISE SEPARATELY UNDERTAKEN BY THE LICENSOR, TO THE EXTENT POSSIBLE, THE LICENSOR OFFERS THE LICENSED MATERIAL AS-IS AND AS-AVAILABLE, AND MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND CONCERNING THE LICENSED MATERIAL, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHER. THIS INCLUDES, WITHOUT LIMITATION, WARRANTIES OF TITLE, MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, ABSENCE OF LATENT OR OTHER DEFECTS, ACCURACY, OR THE PRESENCE OR ABSENCE OF ERRORS, WHETHER OR NOT KNOWN OR DISCOVERABLE. WHERE DISCLAIMERS OF WARRANTIES ARE NOT ALLOWED IN FULL OR IN PART, THIS DISCLAIMER MAY NOT APPLY TO YOU.
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@bye
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