CL-SOM-AM57x: Linux: Manual Installation: destination: eMMC

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Introduction

This article provides an introduction on how to install the Linux kernel and the example root filesystem image on the CompuLab CL-SOM-AM57x System-on-Module / Computer-on-Module eMMC internal storage using one of the following sources:

  • SD card
  • USB storage device
  • Network interface

Preparation steps

  • Obtain a PC workstation with a serial communication port.
  • Download the Linux package for CL-SOM-AM57x from CompuLab website. Unzip the package to a directory on your host workstation.
  • All image files mentioned below can be found in the install subdirectory.
  • Connect the host PC to the SBC-AM57x base-board (connector P8) via the serial cable supplied with the evaluation kit.
Admolition note.png For networked installation you need to install a TFTP and NFS servers on the host PC

Preparing installation media

  • Obtain an SD card or USB storage with minimum capacity of 1GB.
  • Create a first partition on the installation media. The partition can be formatted either ext2/3/4 or FAT16/32 file system.
  • Copy the content of the install directory from the unzipped Linux package to the root directory on the first partition of the installation media.
Admolition note.png Installation storage media must contain a partition table. Use fdisk (or alike) utility to create a partition table.
Admolition note.png For networked installation
  • Connect the CL-SOM-AM57x Ethernet port (connector P21 on the SBC-AM57x) to your local network using the standard Ethernet cable.
  • Make sure the dedicated TFTP server as well as NFS server (may be the same machine) are connected to the local network too.
  • Copy the content of the install directory from the unzipped Linux package in a location accessible by the TFTP server.
  • Copy the content of the install directory from the unzipped Linux package to a directory exported through NFS.

Boot into the installation environment (ramdisk)

  • Start terminal emulation software on your PC with the following serial port settings:
Baud Rate Data Bits Stop Bits Parity Flow Control
115200 8 1 none none
  • Insert the installation media into the MMC/SD socket (P9) or USB connector (P6) on the SBC-AM57x.
  • Make sure no other removable media is plugged.
  • Turn on the device. Press a key to prevent a possible autoboot and get into the U-Boot command prompt.
Admolition note.png If the boot settings of your device are different than the default, you may need to press and hold Ctrl-C while turning the device on, in order to get command prompt.
  • Use the following U-Boot commands to boot the installation environment from the installation SD card:
U-Boot# mmc dev 0 && mmc rescan
U-Boot# load mmc 0 0x88000000 ramdisk.dtb && load mmc 0 0x82000000 kernel.img && load mmc 0 0x88080000 ramdisk.img
U-Boot# setenv bootargs "root=/dev/ram0 rw ramdisk_size=16384 console=ttyO2,115200n8 vram=16M"
U-Boot# bootz 0x82000000 0x88080000 0x88000000
  • Use the following U-Boot commands to boot the installation environment from the installation USB storage:
U-Boot # usb start
U-Boot # load usb 0 0x88000000 ramdisk.dtb && load usb 0 0x82000000 kernel.img && load usb 0 0x88080000 ramdisk.img
U-Boot # setenv bootargs "root=/dev/ram0 rw ramdisk_size=16384 console=ttyO2,115200n8 vram=16M"
U-Boot # bootz 0x82000000 0x88080000 0x88000000
Admolition note.png For networked installation

Use the following U-Boot commands to boot the installation environment from a TFTP and NFS servers: 

U-Boot# dhcp; setenv serverip <tftp server ip address>
U-Boot# setenv bootargs "root=/dev/ram0 rw ramdisk_size=16384 console=ttyO2,115200n8 vram=16M ip=dhcp"
U-Boot# tftpboot 0x88000000 ramdisk.dtb; tftpboot 0x82000000 kernel.img; U-Boot# tftpboot 0x88080000 ramdisk.img
U-Boot# bootz 0x82000000 0x88080000 0x88000000

Mount installation source

  • Use the following mount command to mount the installation SD card.
The character X should be replaced with the SD card device block number:
root@cl-ramdisk:~# mkdir -p /media/install && mount /dev/mmcblkXp1 /media/install
  • Use the following mount command to mount the installation USB storage.
The character X should be replaced with the USB drive letter
root@cl-ramdisk:~# mkdir -p /media/install && mount /dev/sdX1 /media/install
Admolition note.png For networked installation
  • Copy the content of the install directory from the unzipped Linux package to a directory exported through NFS.
  • Mount the NFS share:
root@cl-ramdisk:~# ifup eth1
root@cl-ramdisk:~# mkdir -p /media/install && mount -o nolock <host ip>:/path/to/nfs/share /media/install

Install Images

  • Unmount all eMMC partitions:
root@cl-ramdisk:~# umount -l /dev/mmcblk0p*
  • Clean up the eMMC flash:
root@cl-ramdisk:~# dd if=/dev/zero of=/dev/mmcblk0 bs=1M count=1
root@cl-ramdisk:~# hdparm -z /dev/mmcblk0
  • Create two partitions for the Linux kernel (EXT2 100M) and root file system (EXT4 the rest of the disk) on the eMMC flash:
root@cl-ramdisk:~# echo -e "n\np\n1\n\n+100M\nn\np\n2\n\n\nw\neof\n" | fdisk /dev/mmcblk0
  • Format the first partition with EXT2 file system:
root@cl-ramdisk:~# mkfs.ext2 -L boot /dev/mmcblk0p1
  • Format the second partition with EXT4 file system:
root@cl-ramdisk:~# mkfs.ext4 -L rootfs /dev/mmcblk0p2
  • Mount both partitions:
root@cl-ramdisk:~# mkdir -p /media/boot && mount /dev/mmcblk0p1 /media/boot
root@cl-ramdisk:~# mkdir -p /media/rootfs && mount /dev/mmcblk0p2 /media/rootfs
  • Copy zImage-cl-som-am57x and *.dtb to the first (EXT2) partition:
root@cl-ramdisk:~# cp /media/install/zImage-cl-som-am57x /media/install/*.dtb /media/boot && sync
  • Extract the content of rootfs.tar.bz2 onto the second partition:
root@cl-ramdisk:~# tar --numeric-owner -xpf /media/install/rootfs.tar.bz2 -C /media/rootfs && sync
  • Unmount both partitions:
root@cl-ramdisk:~# umount /dev/mmcblk0p1
root@cl-ramdisk:~# umount /dev/mmcblk0p2

After Installation

  • Remove the installation media and reboot the device
  • Press a key to prevent a possible autoboot and get into the U-Boot command prompt.
  • Set default U-Boot environment:
U-Boot# env default -a
  • Select the eMMC as the boot storage
U-Boot# setenv bootcmd 'run emmcboot'

Select video output

CL-SOM-AM57x evaluation platform (SBC-AM57x) has four video output interfaces: LCD, DVI, LVDS and HDMI. Current version of Xorg driver of CL-SOM-AM57x example root file system supports mirror video output mode only. It causes last registered video output device (LCD) resolution to be propagated to other devices.

In order to force a specific video output device to be selected as a primary device the U-Boot environment variables should be adjusted.

  • To enable HDMI video output:
U-Boot# setenv displaytype hdmi
  • To enable LCD video output:
U-Boot# setenv displaytype lcd
  • To enable LVDS video output:
U-Boot# setenv displaytype lvds
  • To enable DVI video output:
U-Boot# setenv displaytype dvi

Boot the module

  • Save U-Boot environment:
U-Boot # saveenv
  • Boot command:
U-Boot # reset

See also

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