Linux Kernel - 4.4

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Linux 4.4 for AT91 source code

The Linux kernel for Atmel | SMART Processor Based PMUs (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-4.4-at91

Tags

linux4sam_5.5 tag

Enhancements are added on top of the official v4.4 Linux kernel tag. Note as well that we re-integrate each and every stable kernel release on top of this Long Term Support (LTS) kernel revision. This means that each v4.4.x version is merged in our branch. Here is a little summary of the main enhancements:

• Integration of stable kernel updates up to v4.4.26
• SAMA5D2: ISC and camera sensors enhancements (ov7740) to be compatible with V4L2
• SAMA5D2: ADC driver backport from Linux Mainline
• SAMA5D2: add FIFO configuration for I2C
• WILC1000 WIFI driver backport from a recent Linux "staging" directory content
• HDMI on SAMA5D4 Xplained: verified functioning sii902x driver
• maXTouch driver: stabilize and integrate driver enhancements from atmel-maxtouch github repository
• fixes: LCD driver vertical scaling, OHCI power consumption, SDHCI non-removable devices handling

linux4sam_5.4 tag

• SAMA5D2: chipID, LED, push button, shutdown controller, TRNG
• SAMA5D2: NAND driver enhancements (32 bits ECC)
• SAMA5D2: new I2S driver
• ISI and camera sensors enhancements
• adaptation and use of the Bosch M_CAN device driver
• audio PLL clock driver
• PMIC and charger ACT8945A driver
• crypto engines enhancement
• quad-SPI support: QSPI
• power management: support for ULP1 mode
• support for PDA 4.3", 7" screens
• HDMI on sama5d4 Xplained: add sii902x driver
• USART fractional baud rate support
• fixes: DMA residue computation, HSMCI regulator, i2c hold time

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-sama9x5-github'...
remote: Counting objects: 4524288, done.
remote: Compressing objects: 100% (721/721), done.
remote: Total 4524288 (delta 385), reused 1 (delta 1), pack-reused 4523564
Receiving objects: 100% (4524288/4524288), 1.22 GiB | 1.35 MiB/s, done.
Resolving deltas: 100% (3777338/3777338), done.
Checking connectivity... done.
Checking out files: 100% (49565/49565), 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 usu

$ 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]                linux-4.1-at91 -> linux4sam/linux-4.1-at91
 * [new branch]                linux-4.4-at91 -> linux4sam/linux-4.4-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/linux-4.1-at91
  origin/linux-4.4-at91
  origin/master
$ git checkout origin/linux-4.4-at91 -b linux-4.4-at91
Branch linux-4.1-at91 set up to track remote branch linux-4.4-at91 from origin.
Switched to a new branch 'linux-4.4-at91'

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
• sama5_defconfig: for SAMA5 series chips

Now we Configure and Build kernel for board:

$ make ARCH=arm sama5_defconfig
  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

Now you have an usable compressed kernel image zImage.

If you need an uImage you can run this additional step:

make ARCH=arm uImage LOADADDR=0x20008000

[..]

  Kernel: arch/arm/boot/zImage is ready
  UIMAGE  arch/arm/boot/uImage
Image Name:   Linux-4.1.0-linux4sam_5.3+
Created:      Fri Sep  9 17:02:45 2016
Image Type:   ARM Linux Kernel Image (uncompressed)
Data Size:    3441072 Bytes = 3360.42 kB = 3.28 MB
Load Address: 20008000
Entry Point:  20008000
  Image arch/arm/boot/uImage is ready

make ARCH=arm dtbs

[..]

  DTC     arch/arm/boot/dts/at91rm9200ek.dtb
  DTC     arch/arm/boot/dts/mpa1600.dtb
  DTC     arch/arm/boot/dts/animeo_ip.dtb
  DTC     arch/arm/boot/dts/at91-qil_a9260.dtb
  DTC     arch/arm/boot/dts/aks-cdu.dtb
  DTC     arch/arm/boot/dts/ethernut5.dtb
  DTC     arch/arm/boot/dts/evk-pro3.dtb
  DTC     arch/arm/boot/dts/tny_a9260.dtb
  DTC     arch/arm/boot/dts/usb_a9260.dtb
  DTC     arch/arm/boot/dts/at91sam9261ek.dtb
  DTC     arch/arm/boot/dts/at91sam9263ek.dtb
  DTC     arch/arm/boot/dts/tny_a9263.dtb
  DTC     arch/arm/boot/dts/usb_a9263.dtb
  DTC     arch/arm/boot/dts/at91-foxg20.dtb
  DTC     arch/arm/boot/dts/at91-kizbox.dtb
  DTC     arch/arm/boot/dts/at91sam9g20ek.dtb
  DTC     arch/arm/boot/dts/at91sam9g20ek_2mmc.dtb
  DTC     arch/arm/boot/dts/tny_a9g20.dtb
  DTC     arch/arm/boot/dts/usb_a9g20.dtb
  DTC     arch/arm/boot/dts/usb_a9g20_lpw.dtb
  DTC     arch/arm/boot/dts/at91sam9m10g45ek.dtb
  DTC     arch/arm/boot/dts/pm9g45.dtb
  DTC     arch/arm/boot/dts/at91sam9n12ek.dtb
  DTC     arch/arm/boot/dts/at91sam9rlek.dtb
  DTC     arch/arm/boot/dts/at91-ariag25.dtb
  DTC     arch/arm/boot/dts/at91-ariettag25.dtb
  DTC     arch/arm/boot/dts/at91-cosino_mega2560.dtb
  DTC     arch/arm/boot/dts/at91-kizboxmini.dtb
  DTC     arch/arm/boot/dts/at91sam9g15ek.dtb
  DTC     arch/arm/boot/dts/at91sam9g25ek.dtb
  DTC     arch/arm/boot/dts/at91sam9g35ek.dtb
  DTC     arch/arm/boot/dts/at91sam9x25ek.dtb
  DTC     arch/arm/boot/dts/at91sam9x35ek.dtb

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

Recent FAQ

linux-4.4-at91

• Using Atmel DRMDriver: Using Atmel KMS/DRM LCD driver. (Sama7d65Curiosity, Sama5d29Curiosity, Sam9x75Curiosity, Sam9x60Curiosity, Sam9x60EK, Sama5d27WLSom1EK, Sama5d27Som1EK, Sama5d2PtcEK, Sama5d2Xplained, Sama5d4Xplained, Sama5d4ek, Sama5d3Xplained, Sama5d3xek)
• Using Max Touch: Introduction for how to use maxTouch. (Sama5d29Curiosity, Sam9x75Curiosity, Sam9x60Curiosity)
• Crypto Config: How to configure Crypto driver. (Sama5d29Curiosity, Sam9x75Curiosity, Sam9x60Curiosity, Sama5d2-icp, Sam9x60EK, Sama5d27WLSom1EK, Sama5d27Som1EK, Sama5d2PtcEK, Sama5d2Xplained, Sama5d4Xplained, Sama5d4ek, Sama5d3Xplained, Sama5d3xek)
• USBGadget Config: Configure AT91 USB Gadget on Linux and Endpoint order management (composite USB). (Sama5d29Curiosity, Sam9x75Curiosity, Sam9x60Curiosity, Sama5d2-icp, Sam9x60EK, Sama5d27WLSom1EK, Sama5d27Som1EK, Sama5d2PtcEK, Sama5d2Xplained, Sama5d4Xplained, Sama5d4ek, Sama5d3Xplained, Sama5d3xek, AT91sam9x5-ek, other AT91SAM9 boards)
• Pwm Faq: PWM Driver. (Sama5d29Curiosity, Sam9x75Curiosity, Sam9x60Curiosity, Sam9x60EK, Sama5d27WLSom1EK, Sama5d27Som1EK, Sama5d2PtcEK, Sama5d2Xplained, Sama5d4Xplained, Sama5d3Xplained, Sama5d3xek)
• Iio Adc Driver: Adc IIO driver introduction. (Sama5d4Xplained, Sama5d4ek, Sama5d3Xplained, Sama5d3xek, AT91sam9x5-ek, other AT91SAM9 boards)
• Using Ultra Low Power Mode 1: Using Ultra Low Power mode 1 (ULP1). (Sama5d2-icp, Sama5d27WLSom1EK, Sama5d27Som1EK, Sama5d2PtcEK, Sama5d2Xplained)
• Shutdown Wake Up: Use the Wakeup Feature of the Shutdown Controller.. (AT91sam9x5-ek)
• PDMICAudio Record: Using the PDMIC to record audio stream. (Sama5d2Xplained)
• Using Isi: How to use the Image Sensor Interface. (Sama5d4Xplained, Sama5d4ek, Sama5d3Xplained, Sama5d3xek)