**************************************************
Release Notes:  Linux Image V2.4ff for Colibri T20
**************************************************

Contents:
- U-Boot 2015.04 boot loader
- Linux 3.1.10 kernel, based on NVIDIA's Linux for Tegra (L4T) release R16.5
- Angstrom 2015.06/OpenEmbedded fido/Yocto 1.8 based root file system, using
  LXDE desktop environment

==> Flashing instructions can be found on the Toradex developer article:
http://developer.toradex.com/knowledge-base/flashing-linux-on-tegra-modules

Licensing:
- proprietary multimedia codecs included for evaluation purpose only
- customer required to obtain proper re-distribution license

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Linux Image V2.5 Beta 2 (November 6, 2015)
- U-Boot boot loader:
  - add return code for cfgblock commands which allows scripting
  - increase TFTP blocksize for better performance
  - implement early pmic rail configuration
  - various UBI/Fastmap fixes
  - enabled zero bootdelay check (allows entering U-Boot when bootdelay is 0)
- Linux kernel:
  - improve PMIC RTC accuracy
  - integrate ASIX USB-to-Ethernet driver 4.17.0
  - prevent rare boot lock-up
  - changed Fusion multi touch event reporting to adhere to multitouch slot
  - fix HS UART HW buffer overrun issue
- Linux user-space:
  - updated to latest Angstrom 2015.06/OpenEmbedded fido:
    - glibc 2.22
    - systemd 219
    - Xorg 1.16.1
  - glibc: force memcpy_arm to improve memcpy performance
  - fix USB RNDIS operation
- OpenEmbedded build system:
  - change default tune to Thumb-2
  - local.conf: add Toradex source mirror as pre-mirror
- Update scripts:
  - update.sh: delete intermediate files after use
  - improved update.sh to use module type specific folders allowing update of
    different modules with just one update media

- sources git.toradex.com tag Colibri_T20_LinuxImageV2.5Beta2_20151106
  - repository linux-toradex branch tegra
  - repository u-boot-toradex branch 2015.04-toradex

Note:
- no SD boot integration yet but copying cbootimage to beginning of SD card
  will at least boot

Known Issues:
- LP1 suspend might fail due to pending USB interrupts
- LP1 suspend might hang due to display controller issue

********************************************************************************
Linux Image V2.4 Beta 1 (May 18, 2015)
- U-Boot:
  - update to U-Boot 2015.04
  - new partition layout
  - cbootimage/tegrarcm based update concept
  - new NAND BCH ECC configuration able to fix up to 16 errors per 512 bytes
  - enable ONFI detection, allows to retrieve more details about the NAND chip
  - adjust config block and U-Boot environment locations in flash
  - add generic Toradex config block handling, print exact product description,
    board revision and serial number to the console
  - add command to restore Toradex config block ("cfgblock create")
  - add parallel RGB display support, display the Toradex logo and debug
    console at VGA resolution by default
  - optionally create device-tree properties which make board information
    available from within Linux userspace through procfs (/proc/device-tree/
    serial-number, toradex,board-rev and toradex,product-id)
- Linux kernel:
  - enable module versioning support
  - fix/improve optional 1-wire driver
  - update MTD/UBI/UBIFS subsystem (infradead.org ubifs-v3.1 backport)
  - new NAND BCH ECC configuration able to fix up to 16 errors per 512 bytes
  - SPI driver fix number of words in transfer
  - cleaned-up module configuration/deployment
- Linux user-space:
  - migrate from YAFFS2 to UBIFS
  - update OpenEmbedded from daisy to dizzy:
    - glibc 2.20 (instead of eglibc)
    - systemd 2.18
    - Xorg 1.14.7
    - updated various LXDE packages to newer versions
  - build tegrarcm using static cryptopp library to avoid issues e.g. on 64-bit
    Fedora
  - replace full NTP daemon with systemd's NTP client only systemd-timesyncd
  - blacklist USB RNDIS for connman, use systemd-networkd to configure RDNIS
    network interface (new standard IP of the module is 192.168.11.1!)
  - enable BusyBox resize command to resize the terminal on serial console

- sources git.toradex.com tag Colibri_T20_LinuxImageV2.4Beta1_20150518
  - repository linux-toradex branch tegra
  - repository u-boot-toradex branch 2015.04-toradex

Note:
- mount point names changed from /media/<block device name> to /media<label>
- no SD boot integration yet but copying cbootimage to beginning of SD card
  will at least boot

Known Issues:
- LP1 suspend might fail due to pending USB interrupts
- LP1 suspend might hang due to display controller issue

********************************************************************************
Notes:
- 115200 baud serial debug console on UARTA aka FFUART (lower X25 on EvalBoards
  resp. X27 on V3.1a depending on JP17/19, X13 on Iris) without any handshake
- user account: root with empty password
- UBIFS flash root file system
- opkg package manager
- HDMI aka DVI-D: not all pixel clock frequencies allow for HDMI audio
- CRT: the T20 internal video DAC output is unsupported by NVIDIA's L4T Linux SW
       stack
- Linux host used for update preparation requires proper 32-bit execution
  environment (e.g. install ia32-libs on 64-bit Ubuntu), awk and libusb (e.g.
  install gawk and libusb-1.0-0 on Ubuntu)

Working on latest image:
- U-Boot boot loader
  - environment storage in NAND flash or on MMC/SD card
  - Ethernet
  - MMC/SD cards
  - NAND flash with NVIDIA partition table parsing
  - RAM size auto detection
  - serial console debug UARTA
  - Toradex Colibri configuration block handling
  - USB storage as host
  - TFTLCD framebuffer support
- Linux kernel
  - GPIOlib /sys/class/gpio
  - temperature sensor /sys/bus/i2c/devices/4-004c
  - RTC (Tegra internal, PMIC and board level I2C RTC)
  - Ethernet eth0
  - NAND flash MTD/UBI/UBIFS with 16-bit hardware BCH ECC per 512 bytes
  - serial console debug UARTA ttyS0
  - high speed serial UARTB and UARTD ttyHSX
  - I2C via /dev/i2c-X
  - MMC/SD card, optional 8-bit SDHCI
  - PWM LEDs /sys/class/leds/
  - HDMI SPDIF audio
  - AC97 analogue audio capture, playback and resistive touch
  - SPI via /dev/spidev3.0
  - GMI with multiplexed nPWE and RDnWR
  - framebuffer console
  - custom Ethernet MAC address
  - serial number and board revision
  - watchdog
  - USB host port
  - USB audio driver
  - USB webcam
  - USB raw HID device /dev/hidrawX
  - USB device Ethernet RNDIS, provided by Android gadget
  - automatic USB device/host detection aka OTG support
  - analogue inputs AD0, AD1 /sys/class/power_supply/colibri_t20-analog_inputs 
  - suspend LP1
  - DVFS power management
  - optional parallel camera interface
- Linux user-space
  - graphics (LVDS-1 aka TFTLCD and HDMI-1 aka DVI-D)
  - tegrastats
  - Firefox browser
  - Gstreamer video encode and playback, independent dual full HD video decode
  - GPIO config tool
  - LXDE
  - tegrastats-gtk, CPU information visible in graphical environment

Not working or not tested:
- U-Boot USB keyboard
- Linux kernel
  - IrDA
  - RS-422/485
- Adobe Flash not provided by L4T (and probably never will)

******************************************************************************
Flashing instruction have been moved to the Toradex developer article:
http://developer.toradex.com/knowledge-base/flashing-linux-on-tegra-modules

Toradex, November 6, 2015