Date: Sun, 08 Feb 2015 20:18:56 -0500 Subject: New board: ThinkPad R400 support added to libreboot. --- (limited to 'docs/hcl/r400.html') diff --git a/docs/hcl/r400.html b/docs/hcl/r400.html new file mode 100644 index 0000000..43dfb09 --- /dev/null +++ b/docs/hcl/r400.html @@ -0,0 +1,101 @@ + + + + + + + + + ThinkPad R400 + + + + +

ThinkPad R400

+ + + +

+ It is believed that all R400 laptops are compatible. +

+ +

+ 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 libreboot. Libreboot disables and removes it + by using a modified descriptor: see gm45_remove_me.html (contains notes, plus + instructions) +

+ +

+ Flashing instructions can be found at ../install/index.html#flashrom +

+ +

+ Back to previous index. +

+ +

Compatibility (without blobs)

+ +

+ Usual limitations apply for native graphics initialization + (no VBT and/or INT10H and only GRUB works so no BIOS, so no DOS/Windows support + - who cares? There is no system but GNU, and Linux is one of it's kernels). +

+ +

+ When connecting the AC adapter while system is powered off, system will then power on. + This probably happens in coreboot aswell (with or without blobs). + It's a minor annoyance, but it should be fixed (if it's not already fixed by now). +

+ +

+ This method of disabling the ME leaves the flash descriptor and gbe in place (non-functional data, fully documented) + and disables the ME using soft straps. This means that the gigabit ethernet will still work (putting the machine in + non-descriptor mode would wipe it out). +

+ +

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). +

+ The following errata datasheet from Intel might help with investigation: + http://download.intel.com/design/mobile/specupdt/320121.pdf +

+ +

+ Copyright © 2014, 2015 Francis Rowe <info@gluglug.org.uk>
+ This document is released under the Creative Commons Attribution-ShareAlike 4.0 International Public License and all future versions. + A copy of the license can be found at ../license.txt. +

+ +

+ This document is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See ../license.txt for more information. +

+ +

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