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Wiki Markup
This is a page about the Freescale based i.MX7; PICO-PI-IMX7.
{hide-comments}
{toc:indent=20px|style=disc}
 
h2. Availability
Boards:
[1406-0013-ND|https://www.digikey.com/product-search/en?keywords=1406-0013-ND] at Digi-Key
 
h2. Vendor Documentation
* TechNexion: [https://www.technexion.com/]
** PICO-PI-IMX7-DEV: [https://www.technexion.com/products/evaluation-kits/detail/PICO-PI-IMX7-DEV]
 
h2. Basic Requirements
* Running a recent supported release of Debian, Fedora or Ubuntu on a x86 64bit based PC; without OS Virtualization Software.
* Many of the listed commands assume /bin/bash as the default shell.
* ARM Cross Compiler -- Linaro: [https://www.linaro.org]
** Linaro Toolchain Binaries: [https://www.linaro.org/downloads/]
* Bootloader
** Das U-Boot -- the Universal Boot Loader: [http://www.denx.de/wiki/U-Boot]
** Source: [https://github.com/u-boot/u-boot/]
* Linux Kernel
** Linus's Mainline tree: [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git]
* ARM based rootfs
** Debian: [https://www.debian.org]
** Ubuntu: [https://www.ubuntu.com]
 
h2. imx_usb_loader
imx_usb_loader -- USB & UART loader for i.MX5/6/7/8 series:
Source: [https://github.com/boundarydevices/imx_usb_loader]
Download/build:
{code:title=user@localhost:~$}
git clone https://github.com/boundarydevices/imx_usb_loader
cd imx_usb_loader/
make
{code}
 
h2. ARM Cross Compiler: GCC
This is a pre-built (64bit) version of GCC that runs on generic linux, sorry (32bit) x86 users, it's time to upgrade...
Download/Extract:
{code:title=user@localhost:~$}
wget -c https://releases.linaro.org/components/toolchain/binaries/6.5-2018.12/arm-linux-gnueabihf/gcc-linaro-6.5.0-2018.12-x86_64_arm-linux-gnueabihf.tar.xz
tar xf gcc-linaro-6.5.0-2018.12-x86_64_arm-linux-gnueabihf.tar.xz
export CC=`pwd`/gcc-linaro-6.5.0-2018.12-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
{code}
Test Cross Compiler:
{code:title=user@localhost:~$}
${CC}gcc --version
{code}
{code:title=Test Output:}
arm-linux-gnueabihf-gcc (Linaro GCC 6.5-2018.12) 6.5.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
{code}
 
h2. Bootloader: U-Boot
Das U-Boot -- the Universal Boot Loader: [http://www.denx.de/wiki/U-Boot]
Download:
{code:title=user@localhost:~$}
git clone -b v2019v2020.07-rc4 https://github.com/u-boot/u-boot --depth=1
cd u-boot/
{code}
Configure and Build:
{code:title=user@localhost:~/u-boot$}
make ARCH=arm CROSS_COMPILE=${CC} distclean
make ARCH=arm CROSS_COMPILE=${CC} pico-pi-imx7d_defconfig
make ARCH=arm CROSS_COMPILE=${CC}
{code}
 
h2. Bootloader: imx_usb_loader
Place the board into USB boot mode, setting these Jumpers:
!PICO-PI-IMX7-USB-Boot.png!
Power Board and Check lsusb:
{code:title=user@localhost:~/u-boot$}
lsusb | grep Freescale
Bus 00x Device 00y: ID 15a2:0076 Freescale Semiconductor, Inc
{code}
Load the SPL binary via USB:
{code:title=user@localhost:~/u-boot$}
sudo ~/imx_usb_loader/imx_usb SPL
{code}
Load the u-boot-dtb.img binary via USB:
{code:title=user@localhost:~/u-boot$}
sudo ~/imx_usb_loader/imx_usb u-boot-dtb.img
{code}
Using any key, break into U-Boot Console:
{code:title=SERIAL_CONSOLE_U_BOOT}
Loading Environment from MMC... OK
In:    serial
Out:   serial
Err:   serial
Net:   FEC0
Hit any key to stop autoboot:  0 
=> 
{code}
Use the default environment variables:
{code:title=SERIAL_CONSOLE_U_BOOT}
=> env default -f -a
=> saveenv
{code}
Configure mmc 0 to boot from the data partition, and disable access to boot partitions:
{code:title=SERIAL_CONSOLE_U_BOOT}
=> mmc partconf 0 0 7 0
{code}
Run the DFU agent so we can flash the new images using dfu-util tool:
{code:title=SERIAL_CONSOLE_U_BOOT}
=> dfu 0 mmc 0
{code}
Load the SPL binary via dfu-util:
{code:title=user@localhost:~/u-boot$}
sudo dfu-util -D SPL -a spl
{code}
Load the SPL binary via dfu-util:
{code:title=user@localhost:~/u-boot$}
sudo dfu-util -R -D u-boot-dtb.img -a u-boot
{code}
Remove power and place the board into eMMC boot mode, setting these Jumpers:
!PICO-PI-IMX7-eMMC-Boot.png!
Power Board and enable U-Boot USB Mass Storage mode:
{code:title=SERIAL_CONSOLE_U_BOOT}
Loading Environment from MMC... OK
In:    serial
Out:   serial
Err:   serial
Net:   FEC0
Hit any key to stop autoboot:  0 
=> ums 0 mmc 0
{code}
Verify Linux loaded the USB Mass Storage device, this will be the SD Card used thru out this wiki:
{code:title=user@localhost:~/u-boot$}
lsusb | grep Netchip
Bus 00x Device 00y: ID 0525:a4a5 Netchip Technology, Inc. Pocketbook Pro 903
{code}
 
h2. Linux Kernel
This script will build the kernel, modules, device tree binaries and copy them to the deploy directory.
Download:
{code:title=user@localhost:~$}
git clone https://github.com/RobertCNelson/armv7-lpae-multiplatform
cd armv7-lpae-multiplatform/
{code}
For v5.14.x (Stable):
{code:title=user@localhost:~/armv7-lpae-multiplatform$}
git checkout origin/v5.14.x -b tmp
{code}
Build:
{code:title=user@localhost:~/armv7-lpae-multiplatform$}
./build_kernel.sh
{code}
 
h2. Root File System
h3. Debian 10
|| User || Password ||
| debian | temppwd |
| root | root |
Download:
{code:title=user@localhost:~$}
wget -c https://rcn-ee.com/rootfs/eewiki/minfs/debian-10.4-minimal-armhf-2020-05-10.tar.xz
{code}
 
Verify:
{code:title=user@localhost:~$}
sha256sum debian-10.4-minimal-armhf-2020-05-10.tar.xz
{code}
{code:title=sha256sum output:}
cd598e42850cbef87602bf15ee343abfbf0d8c6ba81028c741672b5f24263534  debian-10.4-minimal-armhf-2020-05-10.tar.xz
{code}
 
Extract:
{code:title=user@localhost:~$}
tar xf debian-10.4-minimal-armhf-2020-05-10.tar.xz
{code}
 
h3. Ubuntu 20.04 LTS
|| User || Password ||
| ubuntu | temppwd |
Download:
{code:title=user@localhost:~$}
wget -c https://rcn-ee.com/rootfs/eewiki/minfs/ubuntu-20.04-minimal-armhf-2020-05-10.tar.xz
{code}
 
Verify:
{code:title=user@localhost:~$}
sha256sum ubuntu-20.04-minimal-armhf-2020-05-10.tar.xz
{code}
{code:title=sha256sum output:}
de0177ac9259fdbcc626ee239f4258b64070c0921dbc38c45fab6925a5becaa1  ubuntu-20.04-minimal-armhf-2020-05-10.tar.xz
{code}
 
Extract:
{code:title=user@localhost:~$}
tar xf ubuntu-20.04-minimal-armhf-2020-05-10.tar.xz
{code}
 
h2. Setup microSD card
We need to access the External Drive to be utilized by the target device. Run lsblk to help figure out what linux device has been reserved for your External Drive.
{code:title=Example: for DISK=/dev/sdX}
lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 465.8G  0 disk
├─sda1   8:1    0   512M  0 part /boot/efi
└─sda2   8:2    0 465.3G  0 part /                <- Development Machine Root Partition
sdb      8:16   1   962M  0 disk                  <- microSD/USB Storage Device
└─sdb1   8:17   1   961M  0 part                  <- microSD/USB Storage Partition
{code}
{code:title=Thus you would use:}
export DISK=/dev/sdb
{code}
{code:title=Example: for DISK=/dev/mmcblkX}
lsblk
NAME      MAJ:MIN   RM   SIZE RO TYPE MOUNTPOINT
sda         8:0      0 465.8G  0 disk
├─sda1      8:1      0   512M  0 part /boot/efi
└─sda2      8:2      0 465.3G  0 part /                <- Development Machine Root Partition
mmcblk0     179:0    0   962M  0 disk                  <- microSD/USB Storage Device
└─mmcblk0p1 179:1    0   961M  0 part                  <- microSD/USB Storage Partition
{code}
{code:title=Thus you would use:}
export DISK=/dev/mmcblk0
{code}
 
Erase partition table/labels on microSD card:
{code}
sudo dd if=/dev/zero of=${DISK} bs=1M count=10
{code}
 
Install Bootloader:
{code:title=user@localhost:~$}
sudo dd if=./u-boot/SPL of=${DISK} seek=1 bs=1k
sudo dd if=./u-boot/u-boot-dtb.img of=${DISK} seek=69 bs=1k
{code}
Create Partition Layout:
With util-linux v2.26, sfdisk was rewritten and is now based on libfdisk.
{code:title=Check the version of sfdisk installed on your pc}
sudo sfdisk --version
{code}
{code:title=Example Output}
sfdisk from util-linux 2.27.1
{code}
{code:title=sfdisk >= 2.26.x}
sudo sfdisk ${DISK} <<-__EOF__
1M,,L,*
__EOF__
{code}
{code:title=sfdisk <= 2.25.x}
sudo sfdisk --unit M ${DISK} <<-__EOF__
1,,L,*
__EOF__
{code}
 
Format Partition:
{code}
for: DISK=/dev/mmcblkX
sudo mkfs.ext4 -L rootfs ${DISK}p1
 
for: DISK=/dev/sdX
sudo mkfs.ext4 -L rootfs ${DISK}1
{code}
Mount Partition:
*On most systems these partitions may be auto-mounted...*
{code}
sudo mkdir -p /media/rootfs/
 
for: DISK=/dev/mmcblkX
sudo mount ${DISK}p1 /media/rootfs/
 
for: DISK=/dev/sdX
sudo mount ${DISK}1 /media/rootfs/
{code}
 
h2. Install Kernel and Root File System
To help new users, since the kernel version can change on a daily basis. The kernel building scripts listed on this page will now give you a hint of what kernel version was built.
{code}
-----------------------------
Script Complete
eewiki.net: [user@localhost:~$ export kernel_version=5.X.Y-Z]
-----------------------------
{code}
 
Copy and paste that "export kernel_version=5.X.Y-Z" exactly as shown in your own build/desktop environment and hit enter to create an environment variable to be used later.
{code}
export kernel_version=5.X.Y-Z
{code}
 
h3. Copy Root File System
{code:title=user@localhost:~$}
sudo tar xfvp ./*-*-*-armhf-*/armhf-rootfs-*.tar -C /media/rootfs/
sync
sudo chown root:root /media/rootfs/
sudo chmod 755 /media/rootfs/
{code}
 
h3. Setup extlinux.conf
{code:title=user@localhost:~$}
sudo mkdir -p /media/rootfs/boot/extlinux/
sudo sh -c "echo 'label Linux ${kernel_version}' > /media/rootfs/boot/extlinux/extlinux.conf"
sudo sh -c "echo '    kernel /boot/vmlinuz-${kernel_version}' >> /media/rootfs/boot/extlinux/extlinux.conf"
sudo sh -c "echo '    append root=/dev/mmcblk2p1 ro rootfstype=ext4 rootwait quiet' >> /media/rootfs/boot/extlinux/extlinux.conf"
sudo sh -c "echo '    fdtdir /boot/dtbs/${kernel_version}/' >> /media/rootfs/boot/extlinux/extlinux.conf"
{code}
 
h3. Copy Kernel Image
Kernel Image:
{code:title=user@localhost:~$}
sudo cp -v ./armv7-lpae-multiplatform/deploy/${kernel_version}.zImage /media/rootfs/boot/vmlinuz-${kernel_version}
{code}
 
h3. Copy Kernel Device Tree Binaries
{code:title=user@localhost:~$}
sudo mkdir -p /media/rootfs/boot/dtbs/${kernel_version}/
sudo tar xfv ./armv7-lpae-multiplatform/deploy/${kernel_version}-dtbs.tar.gz -C /media/rootfs/boot/dtbs/${kernel_version}/
{code}
 
h3. Copy Kernel Modules
{code:title=user@localhost:~$}
sudo tar xfv ./armv7-lpae-multiplatform/deploy/${kernel_version}-modules.tar.gz -C /media/rootfs/
{code}
 
h3. File Systems Table (/etc/fstab)
{code:title=user@localhost:~/$}
sudo sh -c "echo '/dev/mmcblk2p1  /  auto  errors=remount-ro  0  1' >> /media/rootfs/etc/fstab"
{code}
 
h3. Remove microSD/SD card
{code}
sync
sudo umount /media/rootfs
{code}
 
Stop U-Boot USB Mass Storage mode, with CTRL-C, and reset the board:
{code:title=SERIAL_CONSOLE_U_BOOT}
Loading Environment from MMC... OK
In:    serial
Out:   serial
Err:   serial
Net:   FEC0
Hit any key to stop autoboot:  0 
=> ums 0 mmc 0
UMS: LUN 0, dev0, hwpart 0, section 0x0, count 0x720000
Ctrl+C to exit ...
=> reset
{code}
 
h2. Comments
Any questions or comments please go to our TechForum: [TechForum|https://forum.digikey.com/c/linux-on-arm/]

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