Generic recovery device tree for device that use boot header v3/v4

Device that use boot header version v4 supports modular ramdisks, hence we are able to flash vendor_boot:$(ramdisk_name_that's_not_default) without touching OEM specific blobs like that of fstab or kernel modules. The goal is to support all methods of stock ROM asssertion and simulate the same methods that their OEM uses for the purpose of custom rom.

Compile guide

For Lineage recovery

breakfast lineage_marmalade-eng

For TWRP recovery

breakfast twrp_marmalade-eng

For creating vendor_boot ramdisk for devices that use header v4

mka vendorbootimage

Flashing method :

So, we'd be flashing the modular recovery ramdisk alone and it can be performed with the following command

if boot header v4 and if target vendor_boot ramdisk uses gz compression

fastboot flash vendor_boot:recovery recovery.cpio.gz

if boot header v4 and if target vendor_boot ramdisk uses lz4 compression

fastboot flash vendor_boot:recovery recovery.cpio.lz4

References :