Linux Kernel - 6.1
The Linux kernel for Microchip ARM-Based MPUs (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 Microchip 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/linux4microchip/linux/tree/linux-6.1-mchp
Tags
Enhancements are added on top of the official
v6.1 Linux kernel tag where most of the Microchip SoC features are already supported. 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
v6.1.x version is merged in our branch.
Here is a little summary of the main additional enhancements:
- Integration of stable kernel updates up to v6.1.55
- Add initial support for SAM9x75 Curiosity
- Add initial support for SAMA5D29 Curiosity
- Add SAM9x75 XLCD controller driver
- Add Sitronix ST7262 panel support
- Add AC69T88A LVDS Display Panel
- Add SAM9x75 QSPI controller driver
- Add SAM9x75 NAND controller driver
- Display in kernel config in /proc/config.gz
- Crypto: fallback for unsupported ESP header, match AES CBC block size with generic implementation
- IIO: add support for MCP3564 - 2/4/8 channel 153.6 ksps low-noise 24 bit Delta-Sigma ADC
- Add initial support for RNBD451 Bluetooth® Low Energy Module
- Add support for AT25FF321A 4MB SPI flash memory
- Add support for LAN8830, LAN8840, LAN8840, KSZ8091, KSZ9477, VSC8541 Ethernet PHY
Enhancements are added on top of the official
v6.1 Linux kernel tag where most of the Microchip SoC features are already supported. 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
v6.1.x version is merged in our branch.
Here is a little summary of the main additional enhancements:
- Integration of stable kernel updates up to v6.1.22
- Runtime PM support for at_xdmac DMA driver
- System suspend/resume for at_xdmac DMA driver
- Fixes for at_xdmac DMA driver to avoid failure on DMA channels on system suspend/resume
- Runtime PM support for Microchip SPDIFTX driver
- System suspend/resume support for Microchip SPDIFTX driver
- Cleanups and improvements for Microchip SPDIFTX driver
- Runtime PM support for Microchip PDMC driver
- System suspend/resume support for Microchip PDMC driver
- Fix poc noises when starting capture for Microchip PDMC driver
- Runtime PM support for Microchip SPDIFRX driver
- System suspend/resume support for Microchip SPDIFRX driver
- Fix controls for Microchip SPDIFRX driver to avoid concurrency on hardware resources
- Cleanups and improvements for Microchip SPDIFRX driver
- Removed atmel-sdramc driver and handle the clocks on proper clock drivers
- Fix imbalanced reference counter on Ethernet device that made ULP modes to fail
- Runtime PM support on SPI driver
- Delay timer support on Microchip PIT64B driver
- Cleanups on pinctrl driver to avoid potential leaks and simplify code
- Support for line bias flags that have been implemented in gpio API for at91 pio4 pinctrl driver
- Support for push-pull configuration in at91 pio4 pinctrl driver
- Zero length message digest support for hmac in atmel-sha driver
- Detection of in-place operations with two sg lists in atmel-tdes and atmel-aes drivers
- Match cfb block size with generic implementation in atmel-aes driver
- Microchip ISC/XISC mainline compatible drivers
- Enable PAC1934 support on SAMA7G5-EK, SAMA5D2-ICP, SAM9X60-EK boards
- Fix PTP TX timestamp handling due to padding and improve PTP TX timestamp on MACB driver
- Enable PTP support on SAMA7G5
- Enable SAMA7G54 SiPs
Required packages
You must install essential host packages on your build host. These requirements are listed in the Linux kernel documentation with the chapter
Install build requirements. You must follow this process which includes, but not limited to, the following packages:
- build-essential
- flex
- bison
- git
- perl-base
- libssl-dev
- libncurses5-dev
- libncursesw5-dev
- ncurses-dev
Getting Kernel sources
To get the source code, you have to clone the repository:
$ git clone https://github.com/linux4microchip/linux.git
Cloning into 'linux'...
remote: Enumerating objects: 8587836, done.
remote: Total 8587836 (delta 0), reused 0 (delta 0), pack-reused 8587836
Receiving objects: 100% (8587836/8587836), 3.49 GiB | 13.44 MiB/s, done.
Resolving deltas: 100% (7117887/7117887), done.
Updating files: 100% (70687/70687), done.
$ cd linux
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 linux4microchip https://github.com/linux4microchip/linux.git
$ git remote update linux4microchip
Fetching linux4icrochip
From https://github.com/linux4microchip/linux
* [new branch] linux-5.10-mchp -> linux4microchip/linux-5.10-mchp
* [new branch] linux-5.15-mchp -> linux4microchip/linux-5.15-mchp
* [new branch] linux-6.1-mchp -> linux4microchip/linux-6.1-mchp
* [new branch] master -> linux4microchip/master
If you want to use another branch, you can list them and use one of them by doing this:
$ git branch -r
origin/HEAD -> origin/master
origin/linux-5.10-mchp
origin/linux-5.15-mchp
origin/linux-6.1-mchp
origin/master
$ git checkout origin/linux-6.1-mchp -b linux-6.1-mchp
Branch linux-6.1-mchp set up to track remote branch linux-6.1-mchp from origin.
Switched to a new branch 'linux-6.1-mchp'
Setup ARM Cross Compiler
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
arch/arm/configs/sama7_defconfig
-
at91_dt_defconfig
: for SAM9 (ARM926) series chips
-
sama5_defconfig
: for SAMA5 series chips
-
sama7_defconfig
: for SAMA7 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
Now, in the menuconfig dialog, you can easily add or remove some features. Once done, Move to
<Exit>
with arrows and press this button hitting the
Enter
key to exit from this screen.
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-6.1.22-linux4microchip-20
Created: Wed May 4 21:18:58 2022
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 5069704 Bytes = 4950.88 KiB = 4.83 MiB
Load Address: 20008000
Entry Point: 20008000
Kernel: arch/arm/boot/uImage is ready
make ARCH=arm dtbs
[..]
DTC arch/arm/boot/dts/at91-kizbox2-2.dtb
DTC arch/arm/boot/dts/at91-kizbox3-hs.dtb
DTC arch/arm/boot/dts/at91-nattis-2-natte-2.dtb
DTC arch/arm/boot/dts/at91-sama5d27_som1_ek.dtb
DTC arch/arm/boot/dts/at91-sama5d27_wlsom1_ek.dtb
DTC arch/arm/boot/dts/at91-sama5d2_icp.dtb
DTC arch/arm/boot/dts/at91-sama5d2_ptc_ek.dtb
DTC arch/arm/boot/dts/at91-sama5d2_xplained.dtb
DTC arch/arm/boot/dts/at91-sama5d3_xplained.dtb
DTC arch/arm/boot/dts/at91-dvk_som60.dtb
DTC arch/arm/boot/dts/at91-gatwick.dtb
DTC arch/arm/boot/dts/at91-tse850-3.dtb
DTC arch/arm/boot/dts/at91-wb50n.dtb
DTC arch/arm/boot/dts/sama5d31ek.dtb
DTC arch/arm/boot/dts/sama5d33ek.dtb
DTC arch/arm/boot/dts/sama5d34ek.dtb
DTC arch/arm/boot/dts/sama5d35ek.dtb
DTC arch/arm/boot/dts/sama5d36ek.dtb
DTC arch/arm/boot/dts/sama5d36ek_cmp.dtb
DTC arch/arm/boot/dts/at91-sama5d4_ma5d4evk.dtb
DTC arch/arm/boot/dts/at91-sama5d4_xplained.dtb
DTC arch/arm/boot/dts/at91-sama5d4ek.dtb
DTC arch/arm/boot/dts/at91-vinco.dtb
DTC arch/arm/boot/dts/at91-sama7g5ek.dtb
DTC arch/arm/boot/dts/at91-sam9x60_curiosity.dtb
[..]
If the building process is successful, the final images can be found under
arch/arm/boot/ directory.
- linux-6.1-mchp
-
• Using Atmel DRMDriver: Using Atmel KMS/DRM LCD driver. (Sama7d65Curiosity, Sama5d29Curiosity, Sam9x75Curiosity, Sam9x60Curiosity, Sam9x60EK, Sama5d27WLSom1EK, Sama5d27Som1EK, Sama5d2PtcEK, Sama5d2Xplained, Sama5d4Xplained, Sama5d4ek, Sama5d3Xplained, Sama5d3xek)
• Using Systemd: Basic systemd user guide. (Sama7d65Curiosity, Sama5d29Curiosity, Sam9x75Curiosity, Sam9x60Curiosity, Sama7g5-ek, Sama5d2-icp, Sam9x60EK, Sama5d27WLSom1EK, Sama5d27Som1EK)
• Thermal Faq: Thermal management support on SAMA7G5. (Sama7d65Curiosity, Sama7g5-ek)
• Using SAMA 5 D 2 ADCDevice: Using the SAMA5D2-compatible ADC device. (Sama7d65Curiosity, Sama5d29Curiosity, Sam9x75Curiosity, Sam9x60Curiosity, Sama7g5-ek, Sama5d2-icp, Sam9x60EK, Sama5d27WLSom1EK, Sama5d27Som1EK, Sama5d2PtcEK, Sama5d2Xplained)
• 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)
• Using I 2 SC: How to use I2SC. (Sam9x75Curiosity, Sama7g5-ek, Sam9x60EK, Sama5d2Xplained)
• Media Controller: What is Media controller and how to use it with SAM products.. (Sam9x75Curiosity, Sama7g5-ek, Sama5d27WLSom1EK, Sama5d27Som1EK, Sama5d2Xplained)
• ISCWhite Balance Features: White balance features of the Image sensor controller.. (Sam9x75Curiosity, Sama7g5-ek, Sama5d27WLSom1EK, Sama5d27Som1EK, Sama5d2Xplained)
• Sama 7 g 5 Xisc: Detailed explanation of the sama7g5 image acquisition pipeline. (Sam9x75Curiosity, Sama7g5-ek)
• External Component On EBI: Connecting an external component on the External Bus Interface. (Sam9x75Curiosity, Sam9x60Curiosity, Sam9x60EK, Sama5d27Som1EK, Sama5d2PtcEK, Sama5d2Xplained, Sama5d4Xplained, Sama5d4ek, Sama5d3Xplained, Sama5d3xek, AT91sam9x5-ek)
• Sama 7 g 5 Ov 7740: Interfacing sama7g5 with parallel omnivision ov7740 sensor.. (Sama7g5-ek)
• Using ASRC: How to use ASRC. (Sama7g5-ek)
• Boot Logo: Boot Logo for At91 SOC's. (Sama5d2Xplained)