HTC HD2 (htc-leo)

Contributors

 * Langoor
 * (others on IRC)
 * Dominduchami
 * (others on the Matrix chat : Henri Dellal, knuxify and others)

What works

 * Kernel boots
 * Display and touchscreen works
 * Boots with xfce and mate (UI's that require 3D acceleration are not working)
 * Wifi works correctly

What does not work

 * Usb networking
 * 3D acceleration
 * Everything else

Progress

 * Got the kernel to compile, based on maniacx's nougat android kernel
 * The qsd8k-legacy kernel boots correctly :
 * Add firmware for wlan

Next steps

 * Add support for bluetooth and 3D acceleration (?)

Bootloaders
Because of the age of the HD2, there are serval 3rd party bootloaders available, most commonly used:
 * Haret, Haret is a bootloader (provided as haret.exe) to boot linux or android from WITHIN windows mobile, you start windows mobile, not a great choice for postmarketOS.
 * a(MagLDR), proprietary 3rd party bootloader developed by Cotulla, some folks over at Tytung's android forum, reverse egineered it and created aMagLdr, still proprietary (?)
 * cLK, based on littlekernel and download possible with cwm or twrp recovery embedded, seems to be the best option. Littlekernel also provides fastboot wich is handy. Only this bootloader is tested right now.

Installation
MAGLDR would probably also work, but using CLK is easier because of fastboot access. Flashing the rootfs and the kernel to NAND would probably work on the Tmobile US verion of HD2 (it has 1gb of storage space), but it is untested for now.
 * Install HSPL
 * Install the CLK bootloader
 * Install the rootfs using an SD Card
 * Insert the SD Card
 * Boot the device into the CLK bootloader
 * Flash the kernel to the boot partition using  (flashing to the additional partitions such as sboot or tboot should work too)
 * Select the first option (or the other boot partion if it was chosen in the previous step) to boot the kernel

How the wlan support was done

 * Find what wlan chip is being used : bcm4329 in this case
 * Read WiFi page
 * Check what package contains firmware for the chip, in this case it is "firmware-aosp-broadcom-wlan"
 * Change the firmware path in the kernel config
 * Add a nonfree_firmware section :
 * Update checksums, rebuild device and linux packages and boot the device