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making_kernel_with_dtb [2012/12/06 20:17] – 78.122.157.53making_kernel_with_dtb [2013/06/12 08:01] (current) – starox
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 ====== Introduction ====== ====== Introduction ======
  
-Since Linux x.y.z, the kernel support arm device via a device tree. +Since Linux 3.y.z, the kernel support arm devices via a device tree. 
-The idea is to make one kernel which supports all platform. +The idea behind is to make an unique kernel which supports every platforms. 
-The bootloader passes a device tree binary (DTB) to Linux, describing the platform.+This tree describe the devices of the platform in order to initialize them. 
 + 
 +The bootloader passes a device tree binary (DTB) to Linux. 
 If the bootloader can't pass the DTB to the kernel, you need to append to it. If the bootloader can't pass the DTB to the kernel, you need to append to it.
  
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 ^ Distribution name ^ toolchain provider ^ commands to get mkimage command ^ toolchain triplet ^ ^ Distribution name ^ toolchain provider ^ commands to get mkimage command ^ toolchain triplet ^
-| Ubuntu 12.10 | ubuntu |sudo apt-get install arm-linux-gnueabi-gcc | arm-linux-gnueabi- |+| Ubuntu >= 12.10 | ubuntu |sudo apt-get install arm-linux-gnueabi-gcc | arm-linux-gnueabi- |
 | Debian squeeze | [[http://www.emdebian.org/|embedian]] | Follow instruction on [[http://www.emdebian.org/crosstools.html]] or [[http://wiki.debian.org/EmdebianToolchain]] \\ The quick way : \\ ''# echo "deb http://www.emdebian.org/debian/ squeeze main" >> etc/apt/sources.list\\ # apt-get update\\ # apt-get install emdebian-archive-keyring\\ # apt-key add /usr/share/emdebian-tools/emdebian-archive-keyring.gpg\\ # apt-key add /usr/share/keyrings/emdebian-archive-keyring.gpg\\ # apt-get update\\  # apt-get install gcc-4.4-arm-linux-gnueabi'' | arm-linux-gnueabi- | | Debian squeeze | [[http://www.emdebian.org/|embedian]] | Follow instruction on [[http://www.emdebian.org/crosstools.html]] or [[http://wiki.debian.org/EmdebianToolchain]] \\ The quick way : \\ ''# echo "deb http://www.emdebian.org/debian/ squeeze main" >> etc/apt/sources.list\\ # apt-get update\\ # apt-get install emdebian-archive-keyring\\ # apt-key add /usr/share/emdebian-tools/emdebian-archive-keyring.gpg\\ # apt-key add /usr/share/keyrings/emdebian-archive-keyring.gpg\\ # apt-get update\\  # apt-get install gcc-4.4-arm-linux-gnueabi'' | arm-linux-gnueabi- |
  
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 ====== Setting up kernel source ====== ====== Setting up kernel source ======
  
-Get the source from lacie-nas.org :+There is 2 kind of LaCie devices : 
 +  * those supported by the mainstream linux kernel 
 +  * those supported by the lacie-nas.org kernel 
 +  * those unsupported ;-)
  
-  git clone git://lacie-nas.org/linux-lacie.git+Here is some commands to get kernel source from a git repository although there are other way to get the mainstream kernel.\\  
 +These repositories ensure that you have the latest updates.
  
-As DTB is not yet in mainstream for marvell platforms, you need to check out the DTB branch +===== Mainstream =====
-   +
-  cd linux-lacie +
-  git checkout -b remotes/origin/kirkwood/master+
  
-====== Making kernel =====+Get the source from the  [[https://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=summary|git kernel repository]] :
  
-Next build your kernel with your toolchain ( here is for kirkwood ) :+  git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git -b master 
 + 
 +===== Lacie-nas.org ===== 
 + 
 +Get the source from the [[http://git.lacie-nas.org/?p=linux-lacie.git;a=summary|lacie-nas git repository]] : 
 + 
 +  git clone git://lacie-nas.org/linux-lacie.git -b kirkwood/master 
 + 
 +If a work is on-going on a board, then a dedicated branch is created. This branch shoud be up-to-date (and maybe also unstable). For example, for a LaCie CloudBox, you may use the branch kirkwood/cloudbox. 
 + 
 +====== Building kernel ====== 
 + 
 +First, you have to get a kernel configuration for your kernel version and your board. The default configurations for LaCie boards (Orion and Kirkwood) are available [[ftp://lacie-nas.org/kernel/config|in our FPT repository]]. Pick-up the one which suits you best. 
 + 
 +For example, to configure a Linux 3.7.x kernel for a Kirkwood based LaCie boards: 
 + 
 +  cd lacie-linux.git 
 +  wget ftp://lacie-nas.org/kernel/kirkwood/linux_3.7.0-rc6_kirkwood_lacie_defconfig -O .config 
 +  make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- oldconfig 
 + 
 +If you are not happy with our default configurations, you can use the one provided with the kernel. For Kirkwood boards: 
 + 
 +  make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- kirkwood_defconfig 
 +   
 +Now, you can build your kernel:
  
-  make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-  kirkwood_defconfig 
   make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-   make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
  
 This will build kernel image, and dtb for all kirkwood platforms. This will build kernel image, and dtb for all kirkwood platforms.
  
-====== Preparing the kernel for u-boot ======+====== Preparing kernel for U-Boot ======
  
 Now you have to append the DTB to kernel. Now you have to append the DTB to kernel.
-DTB are in the arch/arm/boot/ directory. Choose the one corresponding to your device ( here this is a network space 2 lite ) :+DTB are in the arch/arm/boot/ directory. Choose the one corresponding to your device (here this is a network space 2 lite) :
  
-  cat arch/arm/boot/zImage arch/arm/boot/kirkwood-ns2lite.dtb > zImage+kirkwood-ns2lite.dtb+  cat arch/arm/boot/zImage arch/arm/boot/dts/kirkwood-ns2lite.dtb > zImage+kirkwood-ns2lite.dtb
  
 Now you need to add an header for u-boot loader.  Now you need to add an header for u-boot loader. 
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 ^ Distribution name ^ command to get an arm toolchain ^ ^ Distribution name ^ command to get an arm toolchain ^
-| Ubuntu 12.10 |  sudo apt-get install u-boot-tools | +| Ubuntu 12.10 | sudo apt-get install u-boot-tools | 
 +| Debian Squeeze | apt-get install uboot-mkimage |
  
 Make uImage. This is the binary to be loaded by u-boot : Make uImage. This is the binary to be loaded by u-boot :
making_kernel_with_dtb.1354821424.txt.gz · Last modified: by 78.122.157.53

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