using which Kernel?

Kernel-features-overview on github

4.4.70 on GitHub

sudo apt-get install git make gcc-arm-linux-gnueabihf u-boot-tools
git clone https://github.com/BPI-SINOVOIP/BPI-R2-bsp.git bpi-r2
cd bpi-r2
./build.sh 

see also Patch for build.sh

• Option 4 kernel-config (menuconfig),
• 1 to compile all,
• 3 compile only Kernel, after that option 6, to copy compiled data to SD-folder

if successful finished, Kernel is in folder SD/BPI-BOOT modules in SD/BPI-ROOT

kernel can be copied to Boot-Partition (path, previous Backup!) the modules must be copied as Root

cp SD/BPI-BOOT/bananapi/bpi-r2/linux/uImage /media/$USER/BPI-BOOT/bananapi/bpi-r2/linux/
sudo cp -r SD/BPI-ROOT/lib/modules/4.4.70-BPI-R2-Kernel /media/$USER/BPI-ROOT/lib/modules/

i have forked the official kernel-repo and updated to actual kernel-version, added mt76x2 wireless driver and activated uart0+1:

4.4.x on GitHub

steps to build/install are same except the git clone :)

sudo apt-get install git make gcc-arm-linux-gnueabihf u-boot-tools
git clone https://github.com/frank-w/BPI-R2-4.4.git bpi-r2
cd bpi-r2
./build.sh

v1.2.1 (Nov 23, 2017),including mt76x2/x3 wireless driver

Bootloader (u-boot): https://drive.google.com/file/d/11XQ4n6WYSj7gGPtMwug4SITtYn0GZxOb/view?usp=sharing

https://drive.google.com/drive/folders/1kkFyxeHoskszI7CpSsL6Wi6ROjDrBLOB?usp=sharing

the 4.4-archive (Kernelversion-BPI-R2-Kernel_boot+root.tgz) contains 2 folders, which contents have to be copied to the partiton of SD/MMC with the same name.

• BPI-BOOT ⇒ boot-Partition uImage=Kernel-file, backup first your existing before overwriting it
• BPI-ROOT ⇒ partition with root-fs, here are the kernel-modules (/lib/modules/kernelname). With new kernel-version a new subfolder is created, so you need no backup else the name of kernel is the same.

http://forum.banana-pi.org/t/what-s-the-best-practice-to-build-own-kernel/3937

https://github.com/frank-w/BPI-R2-4.14.git

  sudo apt-get install git make gcc-arm-linux-gnueabihf u-boot-tools
  git clone https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git bpi-r2
  cd bpi-r2
 
  export CROSS_COMPILE=arm-linux-gnueabihf-
  export ARCH=arm
  export INSTALL_MOD_PATH=$(pwd)/mod/
  mkdir $INSTALL_MOD_PATH
 
  #git reset --hard v4.14
  cp pfad/zu/mt7623n_evb_bpi_defconfig arch/arm/configs/
  make mt7623n_evb_bpi_defconfig
  make
 
  ...
 
  #cat arch/arm/boot/zImage arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dtb >zImage_dtb
  cat arch/arm/boot/zImage arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dtb > arch/arm/boot/zImage-dtb
  #mkimage -A arm -O linux -C none -T kernel -a 0x80008000 -e 0x80008000 -d zImage_dtb uImage
  mkimage -A arm -O linux -T kernel -C none -a 80008000 -e 80008000 -n "Linux Kernel 4.14" -d arch/arm/boot/zImage-dtb ./uImage
 
  rm -r $INSTALL_MOD_PATH/lib
  make modules_install
 
  cp uImage /media/$USER/BPI-BOOT/bananapi/bpi-r2/linux/  #<< change mountpoint
  sudo cp -r $INSTALL_MOD_PATH/lib /media/$USER/BPI-ROOT/ #<< change mountpoint

config from user RyderLee ramdisk

pcie.patch for PCIe-Slot (CONFIG_PCIEPORTBUS,CONFIG_PCIEPORTBUS,CONFIG_PCIEPORTBUS have to be activated)

Script to compile/copy changed defconfig

above 4.14.14 only pcie-patch may be needed..

with kernel 4.4.70 mmc0=sd-card and mmc1=emmc, so i have done this also for kernel 4.14 (else you have to change u-boots uenv.txt and Mount-Points in system)

to do this set mmc1-section above mmc0-section arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts and in arch/arm/boot/dts/mt7623.dtsi mmc-swap.diff

with my github-Repo:

sudo apt-get install git make gcc-arm-linux-gnueabihf
git clone https://github.com/frank-w/BPI-R2-4.14.git bpi-r2-4.14
cd bpi-r2-4.14
./build.sh importconfig
./build.sh config #if you want to change the kernel-config
./build.sh

https://drive.google.com/drive/folders/1EGN1TvqCpDHdOAS-mjRg9ipi0kahnOUV?usp=sharing

the 4.14-archive (bpi-r2_kernelversion_gitbranch.tar.gz) contains 2 folders, which contents have to be copied to the partiton of SD/MMC with the same name.

• BPI-BOOT ⇒ boot-Partition, uImage=Kernel-file, backup first your existing uImage before overwriting it
• BPI-ROOT ⇒ partition with root-fs, here are the kernel-modules (/lib/modules/kernelname). With new kernel-version a new subfolder is created, so you need no backup else the name of kernel is the same. The files in the other folders are mainly to get internal wifi working (wmt-tools, firmware, config) and have not to be copied every time (currently not changing). These are only packed in for users who haven't these tools already

there are also binary-packages on github-releases (made by travis-ci) with same file-structure: https://github.com/frank-w/BPI-R2-4.14/releases

you can use this script for installing the tar.gz-package

The linux-kernel has 2 parts…the “main-kernel-image” (uImage) and the modules.

The kernel-image is loaded by uboot from BPI-BOOT-Partition folder bananapi/bpi-r2/linux/. By default the file “uImage” is loaded, but you can choose another name and set variable “kernel” in uEnv.txt.

the modules have to be put to BPI-ROOT-partition (/lib/modules/kernelname).

using dts(i)-nodes (arch/arm/boot/dts/) and porting them to older kernel

• mt7623.dtsi
• mt7623n-bananapi-bpi-r2.dts ⇒ mt7623n-bpi-r2.dts

• evbug will be loaded and displays messages on terminal if local keyboard is connected
  • you can disable via “modprobe -r evbug” (temporary, will be loaded again after next reboot) or add file /etc/modprobe.d/evbug.conf with content “blacklist evbug” (survives reboot)