fix e6400 instructions
remove all the lenovo stuff just a basic stub for now. i'll let nicholas have at it later onhslick-master
Leah Rowe
parent
7c12c507ed
commit
9f2ec6abf0
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@ -47,20 +47,51 @@ P*: Partially works with blobs
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| ***Payloads supported*** | |
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|---------------------------|-----------|
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| **GRUB** | Works |
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| **GRUB** | Not yet |
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| **SeaBIOS** | Works |
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| **SeaBIOS with GRUB** | Works |
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| **SeaBIOS with GRUB** | Not yet |
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</div>
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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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ROM images for Dell Latitude E6400 will be available in the next Libreboot
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release after 20230413, or you can compile a ROM image for installation via
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lbmk, see: [build instructions](../build/)
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We believe all models with iGPU are GM45 and will work perfectly. We suspect
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that the dGPU models are PM45 and won't work yet, because Libreboot currently
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supports just the iGPU (Intel graphics) on these machines.
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There are two possible flash chip sizes for the E6400: 4MiB (32Mbit) or
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2+4MiB (64Mbit).
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2+4MiB (64Mbit). Libreboot presently supports the 4MiB version, and provides
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8MiB images for those who upgrade their flash to 8MiB or 16MiB.
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Most people will want to use the 4MiB images.
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SeaBIOS-only
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------------
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At the time of publishing this port, keyboard initialisation is
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broken in the GRUB payload (it *works fine* in BIOS GRUB, loaded
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from SeaBIOS, but not *coreboot* GRUB provided by Libreboot - see
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build targets `i386-coreboot` and `i386-pc` in GRUB).
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This is being investigated. For the time being, SeaBIOS payload works
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very well and it is provided by Libreboot.
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Blob-free setup (no-ME possible)
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---------------
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This is a GM45/PM45 platform, so completely libre initialisation in
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coreboot is possible, provided by default in Libreboot.
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Management Engine (ME) firmware removed
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-------------------------
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This port in Libreboot makes use of `ich9gen` from ich9utils, which
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you can read about in the [ich9utils manual](../install/ich9utils.md) - this
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creates a no-ME setup. The Intel Management Engine firmware (ME) is completely
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removed, and the ME disabled, just like on ThinkPad X200, T400 and so on.
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*The E6400 laptops may come with the ME (and sometimes AMT in addition) before
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flashing libreboot. Dell also sold configurations with the ME completely
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@ -70,28 +101,3 @@ region almost entirely to 1's, with the occasional 32-bit value (likely not
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executable). libreboot disables and removes it by using a modified descriptor:
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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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The T400 is almost identical to the X200, code-wise. See
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[x200.md](x200.md).
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@ -22,6 +22,12 @@ Here's the [Technical Reference Manual](https://web.archive.org/web/201601091432
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Installation of Libreboot
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-------------------------
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TODO: this patch is now in coreboot gerrit:\
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<https://review.coreboot.org/c/coreboot/+/74248>\
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(more notes about internal flashing)\
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also:\
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<https://www.reddit.com/r/coreboot/comments/12nux51/hp_elite_8200_sff_coreboot_port_current_state/> - see notes about 8300
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You can actually just compile the Libreboot ROM for this, and flash the
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entire ROM, then flash it. The *coreboot* project proper, has information
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about this:
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@ -1,65 +1,45 @@
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---
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title: Flashing the Latitude E6400
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title: Flashing the Dell Latitude E6400
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x-toc-enable: true
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...
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Initial flashing instructions for the E6400.
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Introduction
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============
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Initial flashing instructions for the E6400. ROM images for this board will be
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available in Libreboot releases *after* Libreboot 20230413, or you can [build
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ROM images from source via lbmk](../build/).
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This guide is for those who want libreboot on their Latitude E6400 while
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they still have the original Dell BIOS present. This guide can also be
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followed (adapted) if you brick your E6400, to know how to recover.
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A
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["HMM"](https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/43y6629_05.pdf#page=386)
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(Hardware Maintenance Manual) detailing the process of [dis]assembly
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is available for this model. Be careful when reassembling the laptop as
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the screws on page 114 (with title "1130 Keyboard bezel") are swapped
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and if you follow the HMM you will punch a hole through the bezel in the
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upper right corner.
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Blob-free initialisation!
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=========================
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Serial port {#serial_port}
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-----------
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This board can boot entirely blob-free in the flash. The hardware is similar
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to that of ThinkPad X200, T400 etc where no-ME setup is possible.
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EHCI debug might not be needed. It has been reported that the docking
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station for this laptop has a serial port, so it might be possible to
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use that instead.
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No-microcode setup feasible
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----------------------------
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A note about CPUs
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=================
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[ThinkWiki](http://www.thinkwiki.org/wiki/Category:T400) has a list of
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CPUs for this system. The Core 2 Duo P8400, P8600 and P8700 are believed
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to work in libreboot.
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T9600, T9500, T9550 and T9900 are all compatible, as reported by users.
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Quad-core CPUs
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--------------
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Very likely to be compatible, but requires hardware modification.
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Based on info from German forum post about installing Core Quad CPU on T500 found in coreboot mailing list. Currently work in progress and no guide available.
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- [Coreboot mailing list post](https://mail.coreboot.org/pipermail/coreboot/2016-November/082463.html)
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- [German forum post about install Core Quad on T500](https://thinkpad-forum.de/threads/199129)
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The
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[microcode bugfixes/mitigations added for GM45](../../news/gm45microcode.md)
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are also applicable to this board, for users who are interested. Read that
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article for more information.
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Libreboot still recommends that boot with CPU microcode updates, by default,
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for all the reasons described by Libreboot's [Binary Blobs Reductions
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Policy](../../news/policy.md) but this board run reasonably well without them.
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A note about GPUs
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=================
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-----------------
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Some models have an Intel GPU, while others have both an ATI and an
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Intel GPU; this is referred to as "switchable graphics". In the *BIOS
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setup* program for lenovobios, you can specify that the system will use
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one or the other (but not both).
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We *believe* the dGPU models are PM45, and therefore will require a VGA
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blob for initialisation. This is currently unsupported in Libreboot.
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libreboot is known to work on systems with only the Intel GPU, using
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native graphics initialization. On systems with switchable graphics, the
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Intel GPU is used and the ATI GPU is disabled, so native graphics
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initialization works all the same.
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CPU paste required
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==================
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See [\#paste](#paste).
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Models with iGPU (Intel graphics) are GM45, and fully supported in Libreboot
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with native initialisation.
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Flash chip size {#flashchips}
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===============
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@ -68,15 +48,46 @@ Use this to find out:
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flashrom -p internal
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We believe most/all are 4MB (32Mb) flash sizes, but larger ROM images are
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provided for people who wish to upgrade.
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MAC address {#macaddress}
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===========
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Refer to [mac\_address.md](../hardware/mac_address.md).
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How to flash internally
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========================
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How to flash internally (no diassembly)
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=======================================
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You can flash Libreboot directly from the vendor (Dell) BIOS, without taking
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the machine apart. It can be done entirely from Linux. It will probably also
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work on BSD systems, but it has only been testing on Linux thus far.
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Check `util/e6400-flash-unlock` in the `lbmk.git` repository, or in release
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archives for Libreboot releases *after* 20230413.
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Go in there:
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cd util/e6400-flash-unlock
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make
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With this program, you can unlock the flash in such a way where everything
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is writeable. Information about how to use it is in the `README.md` file which
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is included in that program's directory, or you can read it only here:
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<https://codeberg.org/libreboot/lbmk/src/branch/master/util/e6400-flash-unlock/README.md>
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Literally just run that program, and do what it says. You run it once, and
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shut down, and when you do, the system brings itself back up automatically.
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Then you run it and flash it unlocked. Then you run it again. The source code
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is intuitive enough that you can easily get the gist of it; it's writing some
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EC commands. The EC on this machine is hooked up to the `GPIO33` signal,
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sometimes called `HDA_DOCK_EN`, which sets the flash descriptor override
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thus disabling any flash protection by the IFD - Dell's BIOS doesn't set any
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other type of protection either, such as writing to Protected Range registers.
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With this method, you can probably flash it within 5 minutes. Again, zero
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disassembly required!
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How to flash externally
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=========================
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@ -89,52 +100,5 @@ causes the ICH9 to partially power up and attempt to drive the SPI clock pin
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low, which can interfere with programmers such as the Raspberry Pi. See
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[RPi Drive Strength](spi.md#rpi-drive-strength) for a workaround.
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The procedure
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-------------
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Thermal paste (IMPORTANT)
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=========================
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Because part of this procedure involved removing the heatsink, you will
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need to apply new paste. Arctic MX-4 is ok. You will also need isopropyl
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alcohol and an anti-static cloth to clean with.
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When re-installing the heatsink, you must first clean off all old paste
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with the alcohol/cloth. Then apply new paste. Arctic MX-4 is also much
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better than the default paste used on these systems.
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NOTE: the photo above is for illustration purposes only, and does not
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show how to properly apply the thermal paste. Other guides online detail
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the proper application procedure.
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Memory
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======
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In DDR3 machines with Cantiga (GM45/GS45/PM45), northbridge requires sticks
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that will work as PC3-8500 (faster PC3/PC3L sticks can work as PC3-8500).
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Non-matching pairs may not work. Single module (meaning, one of the slots
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will be empty) will currently only work in slot 0.
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NOTE: according to users reports, non matching pairs (e.g. 1+2 GiB) might
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work in some cases.
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Make sure that the RAM you buy is the 2Rx8 configuration when buying 4GiB sticks
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(In other words: maximum of 2GiB per rank, 2 ranks per card).
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[This page](http://www.forum.thinkpads.com/viewtopic.php?p=760721) might
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be useful for RAM compatibility info (note: coreboot raminit is
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different, so this page might be BS)
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The following photo shows 8GiB (2x4GiB) of RAM installed:\
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Boot it!
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--------
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You should see something like this:
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Now [install Linux](../linux/).
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Have a look online for videos showing how to disassemble, if you wish to
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externally re-flash.
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