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TechNexion PICO-PI-IMX7D is a NXP i.MX 7Dual based development board in
the well-known "Raspberry Pi" form factor, comprising of PICO-IMX7 SoM
and the PICO-PI-IMX7D carrier board.
Usually bundled with a 5" 800x480 LVDS display with I2C touchscreen and
an Omnivision OV5645 camera on a MIPI CSI bus, on a daughterboard. The
board was previously used primarily with "Android Things" ecosystem, but
the project was killed by Google.
This would not be possible, if not for the great tutorial of setting up
Debian on this board, by Robert C. Nelson [1].
Hardware highlights:
CPU: NXP i.MX 7Dual SoC, dual-core Cortex-A7 at 1000 MHz
RAM: 512 MiB DDR3 SDRAM
Storage: 4 GB eMMC
Networking:
- built-in Gigabit Ethernet with Atheros AR8035 PHY,
- Broadcom BCM4339 1x1 802.11ac Wi-Fi (over SDIO) + Bluetooth 4.1
(over SDIO + UART + IS2) combo, with Hirose u.FL connector on the
board,
- dual CAN interfaces on the 40-pin connector,
Interfaces:
- USB-C power input plus USB 2.0 OTG host/device port,
- single USB-A host port,
- serial console over built-in FT232BL USB-UART converter with
micro-USB connector (configuration: 115200-8-N-1),
- analog audio interface with TRRS connector in CTIA standard,
- SPI, I2C and UART interfaces available on the 40-pin,
- mikroBUS connector,
- I2C connector for the optional touch panel,
- parallel LCD output for the optional display,
- MIPI CSI connector for the optional camera
Installation:
1. Connect the serial console to debug USB connector and the terminal of
choice in another window, at 115200-8-N-1. Ensure you can switch to
it quickly after next step.
2. Power-on the board from your PC. Ensure your PC can supply required
current, the board can take more than 1 A in the peak load during
booting and brownout will result in power-on reset loop. Preferably,
use charging-capable USB port or connect through self-powered USB
hub. If U-Boot is present already on the eMMC, interrupt the booting
sequence by pressing any key and skip to point 7.
3. Ensure the boot mode jumpers J1 and J2 are in correct position for
USB recovery:
2 6 2 6
--------------
|o o-o||o-o o|
|o o-o||o-o o|
J1 -------------- J2
1 5 1 5
The jumpers are located just underneath the 40-pin expansion header
and are of the smaller 2 mm pitch.
4. Download and build 'imx_usb_loader' from:
https://github.com/boundarydevices/imx_usb_loader.
5. Power-on the board again from your PC through USB OTG connector.
6. Use 'imx_usb_loader' to load 'SPL' and 'u-boot-dtb.img' to the board:
$ sudo imx_usb u-boot-pico-pi-imx7d/SPL
$ sudo imx_usb u-boot-pico-pi-imx7d/u-boot-dtb.img
7. Switch to the terminal from step 2 and interrupt boot sequence by
pressing any key within 2 seconds.
8. Configure mmc 0 to boot from the data partition and disable access to
boot partitions:
=> mmc partconf 0 0 7 0
This only needs to be set once. If you were running Debian previously,
this is probably already set.
9. Enable USB mass storage passthrough for eMMC from U-boot
=> ums 0 mmc 0
10. Optionally, backup previous eMMC contents by reading out its image.
11. Copy over the factory image to the USB device, for example:
$ sudo dd if=openwrt-imx-cortexa7-pico-pi-imx7d-squashfs.combined.bin \
of=/dev/disk/by-id/usb-Linux_UMS_disk_0-0:0 \
bs=8M status=progress oflag=direct
12. Detach USB MSC interface from your PC and U-Boot by pressing Ctrl+C.
13. Ensure that boot mode jumpers are at the default settings for eMMC
boot:
2 6 2 6
--------------
|o-o o||o o-o|
|o-o o||o-o o|
J1 -------------- J2
1 5 1 5
If they are not, power-off the board, restore them and power-on the
board again. Otherwise, if jumpers are set, just reset the board from
U-Boot CLI:
=> reset
14. The installation is now complete and board should boot successfully.
Upgrading: just use sysupgrade image, as usual in OpenWrt.
Known issues/current limitations:
- OV5645 camera - not described in upstream device tree as of kernel
5.15. There are staging drivers present in upstream Linux tree for
i.MX 7 CSI, MIPI-CSI and video mux, and the configuration is there in
imx7s.dtsi - so this is expected to get supported eventually,
- on-chip ADCs are disabled in upstream device tree, so the kernel
driver remains disabled as well.
[1] https://forum.digikey.com/t/debian-getting-started-with-the-pico-pi-imx7/12429
Signed-off-by: Lech Perczak <lech.perczak@gmail.com>
[pepe2k@gmail.com: commit description reworded]
Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>
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|---|---|---|
| .github | ||
| config | ||
| include | ||
| LICENSES | ||
| package | ||
| scripts | ||
| target | ||
| toolchain | ||
| tools | ||
| .gitattributes | ||
| .gitignore | ||
| BSDmakefile | ||
| Config.in | ||
| COPYING | ||
| feeds.conf.default | ||
| Makefile | ||
| README.md | ||
| rules.mk | ||
OpenWrt Project is a Linux operating system targeting embedded devices. Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the vendor and allows you to customize the device through the use of packages to suit any application. For developers, OpenWrt is the framework to build an application without having to build a complete firmware around it; for users this means the ability for full customization, to use the device in ways never envisioned.
Sunshine!
Development
To build your own firmware you need a GNU/Linux, BSD or MacOSX system (case sensitive filesystem required). Cygwin is unsupported because of the lack of a case sensitive file system.
Requirements
You need the following tools to compile OpenWrt, the package names vary between distributions. A complete list with distribution specific packages is found in the Build System Setup documentation.
binutils bzip2 diff find flex gawk gcc-6+ getopt grep install libc-dev libz-dev
make4.1+ perl python3.6+ rsync subversion unzip which
Quickstart
-
Run
./scripts/feeds update -ato obtain all the latest package definitions defined in feeds.conf / feeds.conf.default -
Run
./scripts/feeds install -ato install symlinks for all obtained packages into package/feeds/ -
Run
make menuconfigto select your preferred configuration for the toolchain, target system & firmware packages. -
Run
maketo build your firmware. This will download all sources, build the cross-compile toolchain and then cross-compile the GNU/Linux kernel & all chosen applications for your target system.
Related Repositories
The main repository uses multiple sub-repositories to manage packages of
different categories. All packages are installed via the OpenWrt package
manager called opkg. If you're looking to develop the web interface or port
packages to OpenWrt, please find the fitting repository below.
-
LuCI Web Interface: Modern and modular interface to control the device via a web browser.
-
OpenWrt Packages: Community repository of ported packages.
-
OpenWrt Routing: Packages specifically focused on (mesh) routing.
-
OpenWrt Video: Packages specifically focused on display servers and clients (Xorg and Wayland).
Support Information
For a list of supported devices see the OpenWrt Hardware Database
Documentation
Support Community
- Forum: For usage, projects, discussions and hardware advise.
- Support Chat: Channel
#openwrton oftc.net.
Developer Community
- Bug Reports: Report bugs in OpenWrt
- Dev Mailing List: Send patches
- Dev Chat: Channel
#openwrt-develon oftc.net.
License
OpenWrt is licensed under GPL-2.0