331 lines
14 KiB
Markdown
331 lines
14 KiB
Markdown
---
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title: HP EliteBook 820 G2
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x-toc-enable: true
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...
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**[PLEASE READ THESE INSTRUCTIONS BEFORE INSTALLING](../../news/safety.md),
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OR YOU MIGHT BRICK YOUR MACHINE: [SAFETY PRECAUTIONS](../../news/safety.md)**
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<div class="specs">
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<center>
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<img tabindex=1 alt="HP EliteBook 820 G2" class="p" src="https://av.libreboot.org/hp820g2/hp820g2.jpg" /><span class="f"><img src="https://av.libreboot.org/hp820g2/hp820g2.jpg" /></span>
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<img tabindex=1 alt="HP EliteBook 820 G2" class="p" src="https://av.libreboot.org/hp820g2/hp820g2_lid.jpg" /><span class="f"><img src="https://av.libreboot.org/hp820g2/hp820g2_lid.jpg" /></span>
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<br/>
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<img tabindex=1 alt="HP EliteBook 820 G2" class="p" src="https://av.libreboot.org/hp820g2/hp820g2_ports1.jpg" /><span class="f"><img src="https://av.libreboot.org/hp820g2/hp820g2_ports1.jpg" /></span>
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<img tabindex=1 alt="HP EliteBook 820 G2" class="p" src="https://av.libreboot.org/hp820g2/hp820g2_ports2.jpg" /><span class="f"><img src="https://av.libreboot.org/hp820g2/hp820g2_ports2.jpg" /></span>
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<br/>
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</center>
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| ***Specifications*** | |
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|----------------------------|------------------------------------------------|
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| **Manufacturer** | HP |
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| **Name** | EliteBook 820 G2 |
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| **Variants** | EliteBook 820 G2 |
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| **Released** | 2014 |
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| **Chipset** | 5th gen (Broadwell, SoC) |
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| **CPU** | Intel i5-5200U, i5-5300U, i7-5500U, i7-5600U |
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| **Graphics** | Intel HD 5500 graphics (libre initialisation) |
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| **Display** | 14" 1366x768 or 1920x1080 TFT |
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| **Memory** | Two slots, max 16GB/slot (32GB), DDR3/SODIMM |
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| **Architecture** | x86_64 |
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| **EC** | SMSC MEC1324 in main boot flash |
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| **Original boot firmware** | HP UEFI firmware |
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| **Intel ME/AMD PSP** | Present. Can be disabled with me_cleaner. |
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| **Flash chip** | SOIC-8 16MiB 128Mbit, 12MiB usable by coreboot |
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```
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W+: Works without blobs;
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N: Doesn't work;
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W*: Works with blobs;
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U: Untested;
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P+: Partially works;
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P*: Partially works with blobs
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```
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| ***Features*** | |
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|---------------------------------------------------|----|
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| **Internal flashing with original boot firmware** | N |
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| **Display (if Intel GPU)** | W+ |
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| **Audio** | W+ |
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| **RAM Init** | W+ |
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| **External output** | W+ |
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| **Display brightness** | W+ |
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| ***Payloads supported*** | |
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|---------------------------|-----------|
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| **GRUB** | Works |
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| **SeaBIOS** | Works |
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| **SeaBIOS with GRUB** | Works |
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</div>
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Full hardware specifications can be found on HP's own website:
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<https://support.hp.com/gb-en/document/c04543492>
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Introduction
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============
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**Unavailable in Libreboot 20231106 or earlier. You must [compile from
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source](../build/), or use a release newer than 20231106.**
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This is a beastly 12.5" Broadwell machine from HP, the main benefit of which is
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greater power efficiency (compared to Ivybridge and Haswell platforms), while
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offering similar CPU performance but much higher graphics performance.
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Variants exist with either Intel Core i5-5200U, i5-5300U, i7-5500U or
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i7-5600U and it comes with a plethora of ports; 3x USB 3.0, DisplayPort (which
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can do 4K 60Hz), a VGA port, can be expanded to 32GB RAM, has *3* slots which
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can take SSDs (PCIe, M2 and regular SATA), also has a side dock connector (for
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a docking station). The screen is eDP type and can be upgraded to 1920x1080.
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This is a nice portable machine, with very reasonable performance. Most people
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should be very satisfied with it, in daily use. It is widely available in
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online market places. This page will tell you how to flash it!
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All variants of this mainboard will come with Intel HD 5500 graphics, which has
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completely free software initialisation in coreboot, provided by *libgfxinit*.
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Build ROM image from source
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---------------------------
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First, install the build dependencies and initialise git, using the
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instructions in [building from source](../build/). Unless you're using a
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release after Libreboot 20231106, you *must* use the latest `lbmk.git`.
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The build target, when building from source, is thus:
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./mk -b coreboot hp820g2_12mb
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NOTE: The actual flash is 16MB, but you must flash only the first 12MB of it.
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The ROM images provided by Libreboot are 12MB.
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There is a separate 2MB *system* flash that you must *erase*, prior to
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installing Libreboot. This, along with Libreboot's modified IFD, bypasses
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the security (HP Sure Start) that the vendor put there, allowing you to
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use coreboot-based firmware such as Libreboot.
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Installation
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============
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Insert binary files
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-------------------
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If you're using a release ROM, please ensure that you've inserted extra firmware
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required refer to the [guide](../install/ivy_has_common.md) for that. (**failure
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to adhere to this advice will result in a bricked machine**)
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If you're *building* from source (using lbmk), the steps takes above are done
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for you automatically, inserting all of the required files. The above link is
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only relevant for *release* images, which lack some of these files.
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Set MAC address
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---------------
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This platform uses an Intel Flash Descriptor, and defines an Intel GbE NVM
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region. As such, release/build ROMs will contain the same MAC address. To
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change the MAC address, please read [nvmutil documentation](../install/nvmutil.md).
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Update an existing Libreboot installation
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-----------------
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<img class="l" tabindex=1 alt="HP EliteBook 820 G2" class="p" src="https://av.libreboot.org/hp820g2/hp820g2_backlit.jpg" /><span class="f"><img src="https://av.libreboot.org/hp820g2/hp820g2_backlit.jpg" /></span>
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NOTE: This section only applies if you haven't enabled write protection. You
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can otherwise use the external flashing instructions (see below) for both the
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initial installation and updates, but for updates you don't need to re-erase
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the private flash, if it was already erased.
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If you're already running Libreboot, and you don't have flash protection
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turned on, [internal flashing](../install/) is possible, but please note:
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You must *only* flash the first 12MB, and nothing in the final 4MB of the flash.
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This is because the EC firmware is in flash, and we don't touch that during
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initial installation or during updates.
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Update it like so:
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Create a dummy 16MB ROM like so:
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```
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dd if=/dev/zero of=new.bin bs=16M count=1
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```
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Then insert your 12MB Libreboot ROM image into the dummy file:
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```
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dd if=libreboot.rom of=new.bin bs=12M count=1 conv=notrunc
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```
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The `libreboot.rom` file is the 12MB image from Libreboot. The `new.bin`
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file is the Libreboot ROM, padded to 16MB. You will not flash the entire 16MB
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file, but flashprog detects a 16MB flash IC. This just makes flashrom not
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complain about mismatching ROM/chip size.
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NOTE: Libreboot standardises on [flashprog](https://flashprog.org/wiki/Flashprog)
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now, as of 27 January 2024, which is a fork of flashrom.
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You should flash each region individually:
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```
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flashprog -p internal --ifd -i gbe -w new.bin --noverify-all
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flashprog -p internal --ifd -i bios -w new.bin --noverify-all
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flashprog -p internal --ifd -i me -w new.bin --noverify-all
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flashprog -p internal --ifd -i ifd -w new.bin --noverify-all
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```
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NOTE: The `--ifd` option uses the regions defined in the *flashed* IFD, so
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they must match the ROM. You can otherwise dump a layout file and use that,
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using the instructions below (using `-l layout.txt` instead of `--ifd`).
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NOTE: If you already did an installation before, and you don't want to
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[change the MAC address](../install/nvmutil.html) stored in the gbe region,
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you can skip the gbe/ifd/me regions as above, and flash just the BIOS region.
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NOTE: Use of `--ifd` requires flashrom 1.2 or higher. If you have an older
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version, or you don't have `--ifd`, you could instead do:
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```
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ifdtool -f layout.txt libreboot.rom
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```
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Then, instead of `--ifd` you would use `-l layout.txt`.
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ALSO: The `--ifd` option makes flashrom flash regions based on what's in
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the *current* flashed IFD.
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Flashing Libreboot first time (hardware)
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========================================
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**PLEASE ENSURE that you dump a copy of both flash ICs (system flash and
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private flash). Take two dumps of each, and make sure each has two good hashes.
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This is because there are certain files that, while you may not need for a
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regular Libreboot installation, may be useful for recovery purposes. You have
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been warned!**
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This section is relevant to you if you're still running the original HP
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firmware. You must [flash externally](../install/spi.md).
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Take stock of these further notes, because there are extra steps that you
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must take.
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HP Sure Start
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-------------
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There is a 16MB flash and a 2MB flash. Read this page for info:
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<https://doc.coreboot.org/mainboard/hp/hp_sure_start.html>
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The page makes it seem more complicated than necessary, from a user's point
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of view. What you really need to do is just erase the 2MB flash IC, and flash
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only the first 12MB of the 16MB flash IC. A photo is shown below. Consult
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the [SPI flashing guide](../install/spi.md) and act as if you were flashing,
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but leave out `-w libreboot.rom` (don't write an image), and instead
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use the `--erase` option, with your clip connected to the private flash (2MB
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flash IC).
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You might want to dump the private flash first, just in case (use `-r priv.rom`
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or whatever filename you want to dump to, and take two dumps, ensuring that
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the hashes match). The private (2MB) flash is inaccessible from your OS. The
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system stores hashes of the IFD, GbE and a copy of IFD/GbE in private flash,
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restoring them if they were modified, but erasing the private flash disables
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this security mechanism.
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Here is a photo of the board, with the flashes:
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HP bootblock
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------------
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See: <https://doc.coreboot.org/mainboard/hp/elitebook_820_g2.html?highlight=elitebook>
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In this page it talks about HP's own bootblock and EC firmware. These are in
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the final 4MB of the flash. You must *not* modify these, because you will brick
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your machine unless the IFD is modified;
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This is why Libreboot provides 12MB images. The IFD in Libreboot is modified, as
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per this coreboot documentation, to make the BIOS region *end* at the last byte
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of the first 12MB in flash, bypassing HP's security entirely. In other words,
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you can run whatever you want (such as Libreboot) in the first 12MB of flash,
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so long as the upper 4MB is untouched and the private 2MB flash has been erased.
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With Libreboot's modified IFD, HP's own bootblock is never executed, but the
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EC firmware *is*, and must be left alone. You do not to insert it in your
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Libreboot ROM because it's already in flash, within that last 4MB.
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Flash a ROM image (hardware)
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-----------------
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**REMOVE all power sources like battery, charger and so on, before doing this.
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This is to prevent short circuiting and power surges while flashing.**
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For general information, please refer to [25xx NOR flash
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instructions](../install/spi.md).
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Remove the bottom cover via the latch, and the flashes are accessible.
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First, dump both flashes for backup, using the `-r` option (instead of `-w`)
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in flashrom. Two dumps of each flash, make sure both dumps match for each chip.
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We will assume that your system flash (16MB) dump is named `dump.bin`. This is
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the dump of your 16MB flash, containing HP's firmware, including the final
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bootblock and EC firmware.
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This gives you everything, including the final 4MB. Now insert your new ROM
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into a copy of `dump.bin`:
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```
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cp -R dump.bin new.bin
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dd if=libreboot.rom of=new.bin bs=12M count=1 conv=notrunc
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```
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Flash `new.bin` to system flash (16MB IC) using the `-w` option in flashrom,
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and erase the private (2MB) flash IC,
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using the `--erase` option (instead of `-w filename.rom`) in flashrom.
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In the above example, you replaced the first 12MB of the HP dump with that of
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your Libreboot image, but leaving the final 4MB intact which contains the EC
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firmware. Libreboot's custom IFD sets everything so that all regions, from
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IFD to GbE, ME and then BIOS region, exist within the first 12MB of flash.
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This makes the machine boot from the end of the 12MB section, containing the
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coreboot bootblock, instead of the HP bootblock (which is never executed but
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must remain intact).
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It's very important that you *erase* the 2MB flash. Be careful *not* to
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erase the system (16MB flash). This is yet another reason why you should keep
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a backup of both flash ICs, just in case (dumped using `-r` in flashrom).
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And that's all. Refer to other documents on Libreboot's website for how
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to handle Linux/BSD systems and generally use your machine.
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TPM 2.0 potentially supported
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==============================
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The onboard TPM is an SLB 9660, which supports TPM 1.2 but it is known to be
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compatible with TPM 2.0 via firmware upgrade. Although not yet tested, we have
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some notes about that here:
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[../../tasks/#hp-820-g2-tpm](../../tasks/#hp-820-g2-tpm)
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Not yet used meaningfully by Libreboot itself, but the TPM can be used to
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implement things like measured boot.
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References
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==========
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See: <https://doc.coreboot.org/soc/intel/broadwell/blobs.html>
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Libreboot's build system automatically pulls down the MRC/refcode files, and
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modifies the refcode to enable the onboard Intel Gigabit Ethernet (GbE). You
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don't need to mess with this at all, when you build Libreboot yourself.
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You can see how this works, by looking at the patch which added 820 G2 support:
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<https://browse.libreboot.org/lbmk.git/commit/?id=401c0882aaec059eab62b5ce467d3efbc1472d1f>
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If you're using release builds, the MRC, refcode and (neutered) ME images are
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missing from flash, and must be re-inserted, using the instructions
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on [this page](../install/ivy_has_common.md).
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