Resin.io and the OpenPi

Introduction

Following on from a previous post on Using Redin.io with Node-RED I have been given a Wireless Things OpenPi device. This is based on the Raspberry Pi Compute Module and hence is a different beast to put software on compared to the regular Raspberry Pi models. The big difference here is that there is no SD or uSD card slot available on the Compute Module or on the OpenPi itself. Instead the eMMC flash memory is installed on the Compute Module and must be programmed by connecting the device to another computer, for example another Raspberry Pi.

Preparation

Build rpiboot – CM eMMC flashing pages.

Connect OpenPi programming port to USB port on host Pi, I’m using a Raspberry Pi 2 here.

sudo bash root@raspberrypi2:~# /home/pi/tools/usbboot/rpiboot Waiting for BCM2835 ... Found serial = 0: writing file /usr/share/rpiboot/usbbootcode.bin Waiting for BCM2835 ... Found serial = 1: writing file /usr/share/rpiboot/msd.elf root@raspberrypi2:~#

Flashing software

Partitioning

root@raspberrypi2:~# fdisk -l /dev/sda


Disk /dev/sda: 3909 MB, 3909091328 bytes

4 heads, 16 sectors/track, 119296 cylinders, total 7634944 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00012301
   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *        2048     7634943     3816448    6  FAT16

root@raspberrypi2:~# fdisk /dev/sda
Command (m for help): p
Disk /dev/sda: 3909 MB, 3909091328 bytes

4 heads, 16 sectors/track, 119296 cylinders, total 7634944 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00012301
   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *        2048     7634943     3816448    6  FAT16
Command (m for help): d

Selected partition 1
Command (m for help): n

Partition type:

   p   primary (0 primary, 0 extended, 4 free)

   e   extended

Select (default p): p

Partition number (1-4, default 1): 1

First sector (2048-7634943, default 2048):

Using default value 2048

Last sector, +sectors or +size{K,M,G} (2048-7634943, default 7634943):

Using default value 7634943
Command (m for help): a

Partition number (1-4): 1
Command (m for help): t

Selected partition 1

Hex code (type L to list codes): c

Changed system type of partition 1 to c (W95 FAT32 (LBA))
Command (m for help): p
Disk /dev/sda: 3909 MB, 3909091328 bytes

4 heads, 16 sectors/track, 119296 cylinders, total 7634944 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00012301
   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *        2048     7634943     3816448    c  W95 FAT32 (LBA)
Command (m for help): w

The partition table has been altered!
Calling ioctl() to re-read partition table.

WARNING: If you have created or modified any DOS 6.x partitions, please see the fdisk manual page for additional information. Syncing disks. root@raspberrypi2:~#

Formatting

Format the partition

root@raspberrypi2:~# mkfs.vfat /dev/sda1 mkfs.vfat 3.0.13 (30 Jun 2012) root@raspberrypi2:~#

Mounting and transferring files

Mount device

root@raspberrypi2:~# mount -t vfat /dev/sda1 /mnt root@raspberrypi2:~# cd /mnt root@raspberrypi2:~# scp -pr andrew@192.168.1.4:noobs/NewOpenPi/* .

root@raspberrypi2:/mnt# ls bootcode.bin os recovery.img BUILD-DATA recovery7.img recovery.rfs config.json recovery.cmdline resin defaults recovery.elf riscos-boot.bin INSTRUCTIONS-README.txt RECOVERY_FILES_DO_NOT_EDIT