Krane

Lenovo IdeaPad Duet Chromebook

Codename	Krane
Baseboard	Kukui

oh Kraaaaneeee...

Krane is an aarch64.. tablet thing, with an exceptionally funny name.
Interesting features include:

• Detachable keyboard, with USB on five pogo pins (VCC, GND, D+, D-, Sense. Pinout pending)
• Relatively thin as far as chromebooks go, especially without the sleeve
• Compatibility with all USI pens, making it an excellent device for taking notes

More info can be found on Krane's postmarketOS wiki page.

Krane

Processor	Mediatek MT8183
Memory	4GB
Storage	64/128GB eMMC

Disassembly

Following pictures taken by WeirdTreeThing (thanks!)

• 
  view after opening the case. Note the flexcable joining both parts.
• 
  bottom part of the case, after disconnecting the display cable
• 
  bare chassis after removing the motherboard
• 
  overview of the motherboard
• 
  motherboard, showing the PMIC, SoC, eMMC, and the MIPI DSI to DP bridge
• 
  bottom side of the motherboard

There are several different screw types (and brackets) which are easy to mix up. Make sure to take note what goes where.

Building Modern Coreboot

# Clone coreboot
git clone https://github.com/coreboot/coreboot
cd coreboot

# Build toolchains
make crossgcc-arm crossgcc-aarch64 CPUS=$(nproc)

make nconfig
# Set vendor to Google, board to Krane

make -j$(nproc)

# Clone ec source
git clone https://chromium.googlesource.com/chromiumos/platform/ec -b firmware-kukui-12573.191.B
cd ec

# Build ec image
make BOARD=krane CROSS_COMPILE_arm=/path/to/coreboot/util/crossgcc/xgcc/bin/arm-eabi- BOOTBLOCK=/path/to/coreboot/build/cbfs/fallback/bootblock.bin -j$(nproc) build/krane/ec.bin

Test pads

Bottom of the motherboard contains various marked testpads, detail photos of which are included below:

• 
  eMMC?
• 
  i²c
• 
  LDO(?) and others
• 
  speaker and misc (DEVEN, fun)