kernel

如何在本機make kernel driver
debug usb轉rs485

---

更新記錄

item	note
20161024	第一版
20161107	新增: fedora_kernel

---

目錄

• make kernel
  • 下載kernel
• build fedora kernel (Building a Kernel from the source RPM )
  • Get the Source
  • Copy the Source Tree and Generate a Patch
  • Configure Kernel Options
  • Build the New Kernel
• Building a kernel from the exploded git trees
• fedora_kernel
• ch341
  • USB serial driver
  • ch341.ko
• 參考

---

make kernel

下載kernel

• apt-get
  kernel download

  apt-get source linux-image-$(uname -r)

• make

  make menuconfig
  make -j8 > /dev/null

---

build fedora kernel (Building a Kernel from the source RPM )

• uname -r

  [erwin@localhost BUILD]$ uname -r
  4.6.5-300.fc24.x86_64

Get the Source

If you’ve never built an RPM before, prepare an RPM package-building environment in your (non-root) home directory by running the following command:

• rpmdev-setuptree
  建立rpmbuild目錄

  [erwin@localhost rpmbuild]$ tree
  .
  ├── BUILD
  ├── RPMS
  ├── SOURCES
  ├── SPECS
  └── SRPMS

• 下載kernel rpm source

  koji download-build --arch=src kernel-$(uname -r)

• 將rpm解開
  將會解到 ${HOME}/rpmbuild/SOURCES 及 ${HOME}/rpmbuild/SPECS

  rpm -Uvh kernel-$(uname -r).src.rpm

• 解開內容如下

  [erwin@localhost rpmbuild]$ tree
  .
  ├── BUILD
  ├── RPMS
  ├── SOURCES
  │   ├── 0001-drm-i915-Reorganize-WM-structs-unions-in-CRTC-state.patch
  │   ├── 0002-drm-i915-Rename-s-skl_compute_pipe_wm-skl_build_pipe.patch
  │   ├── 0003-drm-i915-gen9-Cache-plane-data-rates-in-CRTC-state.patch
  │   ├── 0004-drm-i915-gen9-Allow-calculation-of-data-rate-for-in-.patch
  │   ├── 0005-drm-i915-gen9-Store-plane-minimum-blocks-in-CRTC-wm-.patch
  │   ├── 0006-drm-i915-Track-whether-an-atomic-transaction-changes.patch
  │   ├── 0007-drm-i915-gen9-Allow-skl_allocate_pipe_ddb-to-operate.patch
  ..
  │   ├── tcp-make-challenge-acks-less-predictable.patch
  │   ├── tipc-fix-an-infoleak-in-tipc_nl_compat_link_dump.patch
  │   ├── usb-phy-tegra-Add-38.4MHz-clock-table-entry.patch
  │   ├── USB-usbfs-fix-potential-infoleak-in-devio.patch
  │   ├── watchdog-Disable-watchdog-on-virtual-machines.patch
  │   ├── x509.genkey
  │   ├── x86-Lock-down-IO-port-access-when-module-security-is.patch
  │   ├── x86-Restrict-MSR-access-when-module-loading-is-restr.patch
  │   └── xen-pciback-Don-t-disable-PCI_COMMAND-on-PCI-device-.patch
  ├── SPECS
  │   └── kernel.spec
  └── SRPMS

Copy the Source Tree and Generate a Patch

This step is for applying a patch to the kernel source. If a patch is not needed, proceed to “Configure Kernel Options”.
此處建立new及orig目錄是為了產生patch file

Configure Kernel Options

1. cd ~/rpmbuild/BUILD/kernel-$ver.$fedver/linux-$ver.$subver.$fedver.$arch/
2. cp /boot/xx.config .config
3. Copy the config file to ~/rpmbuild/SOURCES/:

   cp .config ~/rpmbuild/SOURCES/config-`uname -m`-generic

Build the New Kernel

• To specify that only a specific kernel should be built:

  rpmbuild -bb --with <option> --target=`uname -m` kernel.spec

---

Building a kernel from the exploded git trees

下載之後，checkout到特定版本，build kernel跟一般的build法一樣

• git clone

  git clone git://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/fedora.git

• git checkout

  checkout kernel-4.6.5-300.fc24

• note

  Fedora keeps a git tree containing Fedora patches applied on top of the vanilla sources.
  
  $ git clone git://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/fedora.git
  
  $ git checkout -b my_branch kernel-4.7.4-200.fc24
  
  You can now build the kernel following regular kernel instructions. This tree is useful for generating patches that can be applied to the kernel.spec.

---

fedora_kernel

How to Compile Linux Kernel from Source to Build Custom Kernel

• 下載fedora kernel

  git clone git://git.kernel.org/pub/scm/linux/kernel/git/jwboyer/fedora.git

• checkout 特定版本
  依據uname -r來決定要make版本

  git checkout kernel-4.6.5-300.fc24

• make

  make -j8 > /dev/null

• 產生vmlimuz
  產生arch/x86/boot/bzImage(即要更換vmlimux)

  [erwin@localhost fedora]$ make bzImage
    CHK     include/config/kernel.release
    CHK     include/generated/uapi/linux/version.h
    CHK     include/generated/utsrelease.h
    CHK     include/generated/bounds.h
    CHK     include/generated/timeconst.h
    CHK     include/generated/asm-offsets.h
    CALL    scripts/checksyscalls.sh
    DESCEND  objtool
    CHK     include/generated/compile.h
    CHK     include/generated/uapi/linux/version.h
    TEST    posttest
  Succeed: decoded and checked 2123901 instructions
    TEST    posttest
  arch/x86/tools/insn_sanity: Success: decoded and checked 1000000 random instructions with 0 errors (seed:0x300d2f0b)
  Kernel: arch/x86/boot/bzImage is ready  (#1)
  [erwin@localhost fedora]$

• 更新/boot
  make install
  會先backup原本vmlinuz 及 System.map

  sh ./arch/x86/boot/install.sh 4.6.5+ arch/x86/boot/bzImage System.map "/boot"

---

ch341

USB serial driver

• USB serial driver

  Winchiphead CH341 Driver
  
    This driver is for the Winchiphead CH341 USB-RS232 Converter. This chip
    also implements an IEEE 1284 parallel port, I2C and SPI, but that is not
    supported by the driver. The protocol was analyzed from the behaviour
    of the Windows driver, no datasheet is available at present.
    The manufacturer's website: http://www.winchiphead.com/.
    For any questions or problems with this driver, please contact
    frank@kingswood-consulting.co.uk.

ch341.ko

• lsmod
  usbserial -> ch341

  $ lsmod | grep ch341
  ch341                  16384  0 
  usbserial              53248  2 ch341,ftdi_sio
  
  $ lsmod | grep usbserial
  usbserial              53248  2 ch341,ftdi_sio
  
  $ lsmod | grep ftdi_sio
  ftdi_sio               53248  0 
  usbserial              53248  2 ch341,ftdi_sio

• 先移除原本的ch341.ko

  rmmod ch341

• install

  insmod ch341.ko

---

參考

• BuildYourOwnKernel
• kernel download
• 在ubuntu 14.04 編譯 linux kernel

• USB serial driver

• 如何build fedora kernel

  • Building a custom kernel/Source RPM
  • 在 CentOS 下設置一個建立 RPM 的環境
  • Building a custom kernel
  • linux kernel download
• How to Compile Linux Kernel from Source to Build Custom Kernel
• vmlinuz Definition