Linux Kernel - legacy

Linux 3.6.9 for AT91 source code

The Linux kernel for Atmel ARM-based SoC (aka AT91) is distributed as a GIT tree hosted on GitHub as a fork of the official Linus Torvalds' git tree. The objective of the Atmel Linux team is to integrate all the AT91-related material in the official Linux Kernel.
Before completing this inclusion process, which can take time, this website provides the Linux4SAM Linux Kernel git tree for AT91 devices at:

https://github.com/linux4sam/linux-at91/tree/linux-3.6.9-at91

Changes

• Add devicetree support
• HDMI driver for SiI902x component on SAMA5D4-EK and SAMA5D4 Xplained boards
• VDEC is supported on SAMA5D4-EK board
• For drivers which not fully support devicetree, atmel ISI, hlcdc and etc, using arch/arm/mach-at91/board-dt-[sama5.c,sam9.c] add the devices
• serial RX & TX DMA support
• serial fixes and enhancements

Tags

linux4sam_4.2 tag

• ARM Cortex-A5 support (include SAMA5D36 chip support)
• VFP support
• Timer Counter
• Watchdog (beware, can be deactivated by AT91Bootstrap)
• RTC
• Serial driver with DMA support
• I2C interface with DMA support
• SPI interface with DMA support
• CAN
• ADC (with 12 bits support)
• ISI interface (support OV2640, OV2643 and OV5640)
• MCI interface with DMA support
• NAND flash with hadware ECC and DMA support
• serial flash (SPI - at25)
• Enhanced Ethernet drivers & Enhanced Gigabit Ethernet drivers
• USB: host (OHCI & EHCI)
• USB: device/gadget high speed
• LCD base layer / LCD overlay 1, 2 / LCD High End Overlay
• Crypto engines (AES, DES/TDES, SHA) with DMA support
• Pinctrl (PIO muxing, PIO control and configuration)
• Resistive touchscreen
• Capacitive touchscreen maXTouch - PDA module
• Touch button QT1070
• LEDs
• Audio using SSC/I2S - wm8904 codec
• Power management

Getting Kernel sources

To get the source code, you have to clone the repository:

$ git clone git://github.com/linux4sam/linux-at91.git
Cloning into 'linux-at91'...
remote: Counting objects: 5239592, done.
remote: Compressing objects: 100% (764014/764014), done.
Receiving objects: 100% (5239592/5239592), 1018.56 MiB | 11.18 MiB/s, done.
remote: Total 5239592 (delta 4448248), reused 5218219 (delta 4427054)
Resolving deltas: 100% (4448248/4448248), done.
Checking out files: 100% (38567/38567), done.

The source code has been taken from the master branch which is pointing on the latest branch we use.

Note that you can also add this Linux4SAM repository as a remote GIT repository to your usual Linux git tree. It will save you a lot of bandwidth and download time:

$ git remote add linux4sam git://github.com/linux4sam/linux-at91.git
$ git remote update linux4sam
Fetching linux4sam
From git://github.com/linux4sam/linux-at91
 * [new branch]                linux-2.6.39-at91 -> linux4sam/linux-2.6.39-at91
 * [new branch]                linux-3.10-at91 -> linux4sam/linux-3.10-at91
 * [new branch]                linux-3.15-at91 -> linux4sam/linux-3.15-at91
 * [new branch]                linux-3.18-at91 -> linux4sam/linux-3.18-at91
 * [new branch]                linux-3.4.9-at91 -> linux4sam/linux-3.4.9-at91
 * [new branch]                linux-3.6.9-at91 -> linux4sam/linux-3.6.9-at91
 * [new branch]                master     -> linux4sam/master

If you want to use an other branch, you can list them and use one of them by doing this:

$ git branch -r
  origin/HEAD -> origin/master
  origin/linux-2.6.39-at91
  origin/linux-3.10-at91
  origin/linux-3.15-at91
  origin/linux-3.18-at91
  origin/linux-3.4.9-at91
  origin/linux-3.6.9-at91
  origin/master
$ git checkout origin/linux-3.6.9-at91 -b linux-3.6.9-at91
Branch linux-3.6.9-at91 set up to track remote branch linux-3.6.9-at91 from origin.
Switched to a new branch 'linux-3.6.9-at91'

Setup ARM Cross Compiler

• Ubuntu:
  In Ubuntu, you can install the ARM Cross Compiler by doing:

  sudo apt-get install gcc-arm-linux-gnueabi
  export CROSS_COMPILE=arm-linux-gnueabi-
     

• Others:
  For others, you can download the Linaro cross compiler and setup the environment by doing:

  wget -c https://releases.linaro.org/components/toolchain/binaries/4.9-2017.01/arm-linux-gnueabi/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabi.tar.xz
  tar xf gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabi.tar.xz
  export CROSS_COMPILE=`pwd`/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-
     

Configuration files for boards

3.6.9 (linux4sam_4.2 tag) Board Description Binary Device Tree Binary (DTB) Configuration file sama5d3xek linux-3.6.9-at91 zImage zImage-sama5d3.bin sama5d31ek.dtb sama5d33ek.dtb sama5d34ek.dtb sama5d35ek.dtb sama5d36ek.dtb sama5d3_defconfig linux-3.6.9-at91 uImage uImage-sama5d3.bin

Configure and Build the Linux kernel

Now you have to configure the Linux kernel according to your hardware. We have two default configuration at91 SoC in arch/arm/configs

arch/arm/configs/at91_dt_defconfig
arch/arm/configs/sama5_defconfig

• at91_dt_defconfig: for at91sam ARM926 series chips
• sama5d4_defconfig: for SAMA5 series chips
• sama5d3_xplained_defconfig: for SAMA5D3-Xplained board

Now we Configure and Build kernel for board:

$ make ARCH=arm sama5d4_defconfig   # this is for SAMA5D4 series chips
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  SHIPPED scripts/kconfig/zconf.tab.c
  SHIPPED scripts/kconfig/zconf.lex.c
  SHIPPED scripts/kconfig/zconf.hash.c
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
#
# configuration written to .config
#

At this step, you can modify default configuration using the menuconfig

$ make ARCH=arm menuconfig

And build the Linux kernel image, before you build you need set up the cross compile toolchain, check this section.

$ make ARCH=arm

[..]

  Kernel: arch/arm/boot/Image is ready
  Kernel: arch/arm/boot/zImage is ready

make ARCH=arm uImage

[..]
  Kernel: arch/arm/boot/Image is ready
  Kernel: arch/arm/boot/zImage is ready
  UIMAGE  arch/arm/boot/uImage
Image Name:   Linux-3.6.9+
Created:      Mon Feb  4 12:26:46 2013
Image Type:   ARM Linux Kernel Image (uncompressed)
Data Size:    2837352 Bytes = 2770.85 kB = 2.71 MB
Load Address: 20008000
Entry Point:  20008000
  Image arch/arm/boot/uImage is ready

make ARCH=arm dtbs

[..]

DTC: dts->dtb  on file "arch/arm/boot/dts/at91sam9g20ek.dts"
  DTC     arch/arm/boot/at91sam9g20ek_2mmc.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/at91sam9g20ek_2mmc.dts"

[..]

DTC: dts->dtb  on file "arch/arm/boot/dts/at91sam9m10g45ek.dts"
  DTC     arch/arm/boot/at91sam9n12ek.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/at91sam9n12ek.dts"
  DTC     arch/arm/boot/at91sam9g15ek.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/at91sam9g15ek.dts"
  DTC     arch/arm/boot/at91sam9g25ek.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/at91sam9g25ek.dts"
  DTC     arch/arm/boot/at91sam9g35ek.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/at91sam9g35ek.dts"
  DTC     arch/arm/boot/at91sam9x25ek.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/at91sam9x25ek.dts"
  DTC     arch/arm/boot/at91sam9x35ek.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/at91sam9x35ek.dts"
  DTC     arch/arm/boot/sama5d31ek.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/sama5d31ek.dts"
  DTC     arch/arm/boot/sama5d31ek_pda.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/sama5d31ek_pda.dts"
  DTC     arch/arm/boot/sama5d33ek.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/sama5d33ek.dts"
  DTC     arch/arm/boot/sama5d33ek_pda.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/sama5d33ek_pda.dts"
  DTC     arch/arm/boot/sama5d34ek.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/sama5d34ek.dts"
  DTC     arch/arm/boot/sama5d34ek_pda.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/sama5d34ek_pda.dts"
  DTC     arch/arm/boot/sama5d35ek.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/sama5d35ek.dts"
  DTC     arch/arm/boot/sama5d36ek.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/sama5d36ek.dts"
  DTC     arch/arm/boot/sama5d36ek_pda.dtb
DTC: dts->dtb  on file "arch/arm/boot/dts/sama5d36ek_pda.dts"

If the building process is successful, the final images can be found under arch/arm/boot/ directory.