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This is a page about the Freescale based i.MX7; PICO-PI-IMX7.

Availability

Boards:
1406-0013-ND at Digi-Key

Vendor Documentation

Basic Requirements

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:

~/
git clone https://github.com/boundarydevices/imx_usb_loader
cd imx_usb_loader/
make

ARM Cross Compiler: GCC

This is a pre-built (64bit) version of Linaro GCC that runs on generic linux, sorry (32bit) x86 users, it's time to upgrade...
Download/Extract:

~/
wget -c https://releases.linaro.org/components/toolchain/binaries/6.4-2018.05/arm-linux-gnueabihf/gcc-linaro-6.4.1-2018.05-x86_64_arm-linux-gnueabihf.tar.xz
tar xf gcc-linaro-6.4.1-2018.05-x86_64_arm-linux-gnueabihf.tar.xz
export CC=`pwd`/gcc-linaro-6.4.1-2018.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-

Test Cross Compiler:

~/
${CC}gcc --version
arm-linux-gnueabihf-gcc (Linaro GCC 6.4-2018.05) 6.4.1 20180425 [linaro-6.4-2018.05 revision 7b15d0869c096fe39603ad63dc19ab7cf035eb70]
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.

Bootloader: U-Boot

Das U-Boot – the Universal Boot Loader: http://www.denx.de/wiki/U-Boot
Download:

~/
git clone https://github.com/u-boot/u-boot
cd u-boot/
git checkout v2019.01 -b tmp

Configure and Build:

~/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}

Bootloader: imx_usb_loader

Place the board into USB boot mode, setting these Jumpers:

Power Board and Check lsusb:

~/
lsusb | grep Freescale
Bus 00x Device 00y: ID 15a2:0076 Freescale Semiconductor, Inc

Load the SPL binary via USB:

~/u-boot
sudo ~/imx_usb_loader/imx_usb SPL

Load the u-boot.img binary via USB:

~/u-boot
sudo ~/imx_usb_loader/imx_usb u-boot.img

Using any key, break into U-Boot Console:

SERIAL_CONSOLE_U_BOOT
Loading Environment from MMC... OK
In:    serial
Out:   serial
Err:   serial
Net:   FEC0
Hit any key to stop autoboot:  0 
=> 

Use the default environment variables:

SERIAL_CONSOLE_U_BOOT
=> env default -f -a
=> saveenv

Configure mmc 0 to boot from the data partition, and disable access to boot partitions:

SERIAL_CONSOLE_U_BOOT
=> mmc partconf 0 0 7 0

Run the DFU agent so we can flash the new images using dfu-util tool:

SERIAL_CONSOLE_U_BOOT
=> dfu 0 mmc 0

Load the SPL binary via dfu-util:

~/u-boot
sudo dfu-util -D SPL -a spl

Load the SPL binary via dfu-util:

~/u-boot
sudo dfu-util -R -D u-boot.img -a u-boot

Remove power and place the board into eMMC boot mode, setting these Jumpers:

Power Board and enable U-Boot USB Mass Storage mode:

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

Verify Linux loaded the USB Mass Storage device, this will be the SD Card used thru out this wiki:

~/
lsusb | grep Netchip
Bus 00x Device 00y: ID 0525:a4a5 Netchip Technology, Inc. Pocketbook Pro 903

Linux Kernel

This script will build the kernel, modules, device tree binaries and copy them to the deploy directory.
Download:

~/
git clone https://github.com/RobertCNelson/armv7-lpae-multiplatform
cd armv7-lpae-multiplatform/

For v4.20.x (Stable):

~/armv7-lpae-multiplatform/
git checkout origin/v4.20.x -b tmp

Build:

~/armv7-lpae-multiplatform/
./build_kernel.sh

Root File System

Debian 9

User

Password

debian

temppwd

root

root

Download:

~/
wget -c https://rcn-ee.com/rootfs/eewiki/minfs/debian-9.6-minimal-armhf-2018-11-26.tar.xz

Verify:

~/
sha256sum debian-9.6-minimal-armhf-2018-11-26.tar.xz
c9d9b2623131829eeeefa153274219d89887a1984b8dde72cfbfe29f29c7a10d  debian-9.6-minimal-armhf-2018-11-26.tar.xz

Extract:

~/
tar xf debian-9.6-minimal-armhf-2018-11-26.tar.xz

Ubuntu 18.04 LTS

User

Password

ubuntu

temppwd

Download:

~/
wget -c https://rcn-ee.com/rootfs/eewiki/minfs/ubuntu-18.04.1-minimal-armhf-2018-11-26.tar.xz

Verify:

~/
sha256sum ubuntu-18.04.1-minimal-armhf-2018-11-26.tar.xz
d8190bc858bab9db83bec03707b2636dc23646fca2a0420fb49adbedf7d492c5  ubuntu-18.04.1-minimal-armhf-2018-11-26.tar.xz

Extract:

~/
tar xf ubuntu-18.04.1-minimal-armhf-2018-11-26.tar.xz

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.

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
Thus you would use:
export DISK=/dev/sdb
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
Thus you would use:
export DISK=/dev/mmcblk0

Erase partition table/labels on microSD card:

sudo dd if=/dev/zero of=${DISK} bs=1M count=10

Install Bootloader:

~/
sudo dd if=./u-boot/SPL of=${DISK} seek=1 bs=1k
sudo dd if=./u-boot/u-boot.img of=${DISK} seek=69 bs=1k

Create Partition Layout:
With util-linux v2.26, sfdisk was rewritten and is now based on libfdisk.

sudo sfdisk --version
sfdisk from util-linux 2.27.1
sfdisk >= 2.26.x
sudo sfdisk ${DISK} <<-__EOF__
1M,,L,*
__EOF__
sfdisk <= 2.25.x
sudo sfdisk --unit M ${DISK} <<-__EOF__
1,,L,*
__EOF__

Format Partition:

for: DISK=/dev/mmcblkX
sudo mkfs.ext4 -L rootfs ${DISK}p1
 
for: DISK=/dev/sdX
sudo mkfs.ext4 -L rootfs ${DISK}1

Mount Partition:
On most systems these partitions may will be auto-mounted...

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/

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.

-----------------------------
Script Complete
eewiki.net: [user@localhost:~$ export kernel_version=4.X.Y-Z]
-----------------------------

Copy and paste that "export kernel_version=4.X.Y-Z" exactly as shown in your own build/desktop environment and hit enter to create an environment variable to be used later.

export kernel_version=4.X.Y-Z

Copy Root File System

~/
sudo tar xfvp ./*-*-*-armhf-*/armhf-rootfs-*.tar -C /media/rootfs/
sync
sudo chown root:root /media/rootfs/
sudo chmod 755 /media/rootfs/

Setup extlinux.conf

~/
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"

Copy Kernel Image

Kernel Image:

~/
sudo cp -v ./armv7-lpae-multiplatform/deploy/${kernel_version}.zImage /media/rootfs/boot/vmlinuz-${kernel_version}

Copy Kernel Device Tree Binaries

~/
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}/

Copy Kernel Modules

~/
sudo tar xfv ./armv7-lpae-multiplatform/deploy/${kernel_version}-modules.tar.gz -C /media/rootfs/

File Systems Table (/etc/fstab)

sudo sh -c "echo '/dev/mmcblk2p1  /  auto  errors=remount-ro  0  1' >> /media/rootfs/etc/fstab"

Remove microSD/SD card

sync
sudo umount /media/rootfs

Stop U-Boot USB Mass Storage mode, with CTRL-C, and reset the board:

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

Comments

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