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************************************************
Release Notes: Linux Image V2.x for Apalis iMX6
************************************************
Contents:
- U-Boot 2013.10 boot loader
- Linux 3.0.35 kernel, based on Freescale's BSP release 4.1.0 and patches from
Boundary Devices
- OpenEmbedded oe-core dora/2013.12 based root file system, using LXDE
desktop environment
Licensing:
- proprietary multimedia codecs included for evaluation purpose only
- customer required to obtain proper re-distribution license
********************************************************************************
Linux Image V2.2 Beta 1 (April 04, 2014)
- U-Boot:
- initial release
- Linux kernel:
- initial release
- rootfs / oe-core:
- initial release
- sources git.toradex.com tag Apalis_iMX6_LinuxImageV2.2Beta1_20140404
Known Issues:
- connecting an analogue mic to the on module codec resets the codec, so that
neither headphone out nor mic in works anymore. Workaround: Have mic
connected before boot or change the output source between DAC/LineIn
- on first boot the resizing process adversely affects system performance for
the first few minutes until completed
- display resolution can be set for some output configurations, set the u-boot
environment variable vidargs accordingly. Some vidargs_xx variables
provided for reference.
- backlight PWM BKL_PWM (hard-coded to 0 in u-boot > full brightness on a EDT
display)
- X uses only the fb0 device
- video decoding leaks resources, after a while it stops working
- initial rootfs must fit in RAM, i.e. it must not be greater than ~900MB
********************************************************************************
Notes:
- 115200 baud serial debug console on UART1 (EvalBoard lower X28 resp.
X29 depending on JP10/12, X22 on Ixora) without any handshake
- user account: root with empty password
- eMMC: partition 1: vfat with kernel, partition 2 ext3 root file system
- opkg package manager
- HDMI aka DVI-D: not all pixel clock frequencies allow for HDMI audio
- Linux host used for update preparation requires proper 32-bit execution environment
(e.g. install ia32-libs on 64-bit Ubuntu) and awk (e.g. install gawk on Ubuntu)
Working on latest image:
- U-Boot boot loader
- environment storage in eMMC
- Gigabit Ethernet
- MMC/SD cards
- eMMC flash
- serial console debug UART1
- Toradex Apalis configuration block handling
- USB storage as host on USB host ports
- Linux kernel
- GPIOlib /sys/class/gpio (the 'export’ interface is not implemented)
- temperature sensor /sys/devices/virtual/thermal/thermal_zone0/temp
- Gigabit Ethernet (i.MX 6 errata, only 400 Mbps sustainable data rate)
- eMMC ext3
- serial console debug UART1
- I2C via /dev/i2c-X
- 8-bit MMC card mmc1
- 4-bit SD card mmc2
- HDMI audio
- analogue audio playback and resistive touch
- audio noise is high, workaround is to set headphone volume to maximum and use the DAC volume
- SPI via /dev/spidev0.0 aka SPI1 and /dev/spidev1.0 aka SPI2
- custom Ethernet MAC Address
- serial number
- USB host port
- USB audio driver
- USB webcam
- USB raw HID device /dev/hidrawX
- USB device Ethernet RNDIS
- automatic USB device/host/suspend detection aka full OTG support
- analog input via IIO framework
- CAN via can0 and can1
- PCIe (regular ports and mini-PCIe slot)
- SATA (regular port or mSATA slot)
- DVFS power management
- Linux user-space
- Firefox
- Gstreamer playback
- OpenGL, but thermal issues if running full speed
- LXDE
- resize rootfs partition to full eMMC capacity
- Display:
- only first output used by X11
- dual output on HDMI and LVDS, both in 1920x1080
- single output on EDT 7” Display
- resolution setting through modedb string in kernel command line (working
resolutions to be tested)
Not working or not tested:
- U-Boot boot loader
- framebuffer support
- USB OTG1 support
- Linux kernel
- IrDA
- RS-422/485
- SIM card
- suspend LP1
- high speed serial UART2, UART4 and UART5
- S/PDIF (not worked on so far)
- HDA audio IF on MXM connector (not possible with i.MX 6)
- I2S / AC97 on MXM connector
- analogue audio capture with on module codec (not tested)
- framebuffer console
- watchdog
- parallel camera interface
- CSI2 camera interface
- PWM LEDs /sys/class/leds/
- UARTs apart from debug output, all UART control lines (not tested)
- Linux user-space
- Gstreamer encoding (not tested)
- GPIO config tool not available
- DHCP server configuration on USB RNDIS missing
- Display:
- on same monitors HDMI EDID does not negotiate correct timings,
adding mxc_hdmi.only_cea=1 to the kernel command line may help
- more than one framebuffer used as a X screen
- backlight PWM
- VGA output
- DSI output
******************************************
eMMC Boot: Apalis iMX6Q 1GB V1.0a (Sample)
******************************************
Initial Preparation:
- download and extract Apalis_iMX6_LinuxImageVx.yz.tar.bz2 package with root
permissions
- use any VFAT formatted SD resp. uSD card with at least 1000 MB of free space
- run update.sh script with optional -o argument pointing to mount point of
above mentioned card
Flash eMMC:
- EvalBoard V1.0a
- connect serial debug console to lower X28 or X29 using null modem RS-232
or regular USB cable
- insert above prepared SD card into MMC SDIO-socket (X18)
- Ixora V1.0a
currently not supported, the update scripts will have to be updated to use mmc 2 and not mmc 1
- connect serial debug console to X21 using null modem RS-232 cable and a
10 pin IDC to 9 pin D-sub male connector. (DTK or Intel standard)
- insert above prepared SD card into SD card/MMC SDIO-socket (X10)
- Boot to u-boot prompt and start the update:
- apply power or reset
- hit any key to stop auto booting
- use 'run setupdate' u-boot command and then
- use 'run update' u-boot command
Boot from eMMC:
- EvalBoard V1.0a or Ixora V1.0a
- power cycle
- upon first boot post-install scripts are run which takes around 2 minutes, please be patient
If the boot loader on the module got corrupted this recovers it by loading u-boot
over USB into the module's RAM and executing it there:
- EvalBoard V1.0a
- connect USB micro A/B (X49) or USB B (X50) to development workstation using micro or regular USB cable
- Ixora V1.0a
currently not supported, the update scripts will have to be updated to use mmc 2 and not mmc 1
- connect USB micro A/B (X9) to development workstation using regular micro USB cable
- make sure JP2 is removed and nothing is connected to the lower USB host port X8
- for more information please consult Ixora datasheet section 3.3 and chapter 4
- have the module in recovery mode and load u-boot over USB to the module's RAM:
- lsusb should show a 15a2:0054 Freescale Semiconductor, Inc. device if
the module is in recovery mode
- if you have a 32-bit Linux host, replace imx_flash/imx_usb with its 32-bit version imx_flash/imx_usb.m32 i.e.
sudo mv imx_flash/imx_usb imx_flash/imx_usb.m64; sudo ln -s imx_usb.m32 imx_flash/imx_usb
- run ./update.sh -d
- stop at the u-boot prompt and begin the update as stated above
Toradex, April 04, 2014
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