Ouya (ouya-ouya)

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Ouya, Inc. Ouya
Ouya
Ouya
Manufacturer Ouya, Inc.
Name Ouya
Codename ouya_1_1
Released 2013
Original software Android
Hardware
Chipset Nvidia Tegra 3
CPU 4x 1.7 GHz Cortex-A9
GPU Nvidia GeForce ULP
520 MHz (12.48 GFLOPS)
Display 1x HDMI
Storage 8/16 GB
Memory 1 GB
Architecture armv7
Unixbench Whet/Dhry score 1450.2
Features
USB Networking
Works
Flashing
Partial
Touchscreen
Unavailable
Display
Unavailable
WiFi
Works
Xwayland
Works
FDE
Partial
Mainline
Partial
Battery
Unavailable
3D Acceleration
Accelerometer
Unavailable
Audio
Bluetooth
Works
Camera
Unavailable
GPS
Unavailable
Mobile data
Unavailable
SMS
Unavailable
Calls
Unavailable
USB OTG



Contributors

  • rendeko
  • ryang2678 (Decatf)
  • ollieparanoid

Maintainer(s)

  • rendeko


Safe Boot

We avoid flashing the boot partition because a corrupted kernel would irreversibly brick the Ouya. We use a tool called Ouya BootMenu (source) that allows us to chain load the postmarketOS kernel using kexec.

Audio

There are two mechanisms to output audio through HDMI.

  • Tegra30 HDA
  • Tegra30 SPDIF

The HDA device is what is used by the downstream kernel and stock Ouya Android ROM. The SPDIF device only outputs to the left channel.

Audio output through the HDA device works on the downstream kernel. The HDA device is card 0 device 3. It can be tested by running speaker-test -Dhw:0,3 -c 2. The SPDIF device is card 1 device 0. It can be tested by running speaker-test -Dhw:1,0 -c 2.

The mainline kernel has a tegra30-hda driver but it isn't working on Ouya. There is no upstreamed driver for the Tegra30 SPDIF device.


The Tegra30 HDA driver writes 4 frames and then hangs.

$ speaker-test -Dhw:0,3 -c 2

speaker-test 1.1.8

Playback device is hw:0,3
Stream parameters are 48000Hz, S16_LE, 2 channels
Using 16 octaves of pink noise
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 64 to 16384
Period size range from 32 to 8192
Using max buffer size 16384
Periods = 4
was set period_size = 4096
was set buffer_size = 16384
 0 - Front Left
snd_pcm_hw_writei
hw_writei: frames = 4096, xferi.result = 4096, err = 0
snd_pcm_hw_writei
hw_writei: frames = 4096, xferi.result = 4096, err = 0
snd_pcm_hw_writei
hw_writei: frames = 4096, xferi.result = 4096, err = 0
snd_pcm_hw_writei
hw_writei: frames = 4096, xferi.result = 4096, err = 0
snd_pcm_hw_writei
hw_writei: frames = 4096, xferi.result = -5, err = -5
Write error: -5,I/O error
xrun_recovery failed: -5,I/O error
Transfer failed: I/O error

The kernel PCM framework in sound/core/pcm_native.c has a timeout waiting for the device to respond.

[  691.115717] tegra-hda 70030000.hda: playback write error (DMA or IRQ trouble?)

It is uncertain why the HDA device isn't working on mainline. Possible avenues to explore:

  • Compare pinmuxes to downstream kernel.
  • Are the necessary clocks enabled and at the correct frequency?

Ethernet

A random MAC address is generated by the kernel at each boot. This is because the smsc9500 Ethernet device does not have a valid mac address stored in EEPROM. To set a consistent MAC address, create the file /etc/udev/rules.d/99-mac-address.rules with the following udev rule.

ACTION=="add", SUBSYSTEM=="net", KERNEL=="eth0", RUN+="/sbin/ip link set dev %k address f6:23:f0:42:98:cf"

Radio

  • The Ouya uses a BCM4330 radio chip for wifi and bluetooth. The downstream and mainline kernel use the same wifi firmware. The firmware shipped with the device is the only known firmware to work with the Ouya. The BCM4330 firmware in linux-firmware does not work.
  • Two later releases (the completely white special edition and completely black 2nd generation) allegedly use a BCM4334 chipset. This needs to be implemented and tested at a future date.

Display Resolution

On the mainline kernel, display resolutions above 1280x720 are glitchy. The GPU is dependent on memory bandwidth but EMC scaling is not implemented in mainline. The Ouya bootloader sets the memory to 400 Mhz. Higher display resolutions work a bit better when the memory is set to 800Mhz but it is still glitchy.

HDMI CEC

The Ouya is missing HDMI CEC support at the hardware design level.

References:

Other Notes

  • Splash screen doesn't appear
  • Hildon doesn't work?
  • USB booting needs to be tested


Installation

How to enter flash mode

1. Connect Ouya to PC

2. Use adb reboot recovery to enter recovery (or adb reboot bootloader to enter bootloader for fastboot commands)

pmbootstrap

ToDo Work in progress, may be wrong. Only attempt for development

1. Flash CWM and Ouya BootMenu.

2. Turn on Ouya, then press the power button many times until it scrolls to Bootloader, and then wait until the boot menu disappears.

3. Run the following using pmbootstrap:

$ pmbootstrap init
$ pmbootstrap install --no-fde
$ pmbootstrap export
$ pmbootstrap flasher flash_rootfs
WARNING: This will create two partitions under system partition instead of one which won't allow you to use Normal Boot option in Ouya BootMenu

4. Reboot Ouya, then press the power button many times until it scrolls to Recovery, and then wait until CWM appears.

6. Using CWM menu options, mount /data partition.

7. Copy postmarketOS boot.img to /sdcard as altboot.img:

$ adb push /tmp/postmarketOS-export/boot.img-ouya-ouya /sdcard/altboot.img

8. Reboot Ouya, then press the power button many times until it scrolls to Alternate Boot, and then wait until postmarketOS appears.

Using data partition as rootfs

WARNING: Flashing to the userdata partition will overwrite all data on the device. Backup all data to another device before proceeding.

It is much more usable to flash rootfs to the data partition which is around 5.7GB in size.

Flashing to the data partition

Specify the partition to flash rootfs to with the --partition argument:

$ pmbootstrap flasher flash_rootfs --partition userdata

Copy postmarketOS boot.img to /system:

$ adb push /tmp/postmarketOS-export/boot.img-ouya-ouya /system/boot.img

Updating the kernel

When the apk package manager updates the kernel package (e.g. linux-ouya-ouya or linux-ouya-ouya-mainline) then the boot.img will be regenerated with the new kernel. Run the following commands on device to install the updated boot.img:

$ mkdir /system
$ mount /dev/mmcblk1p3 /system
$ cp /boot/boot.img-ouya-ouya /system/boot.img

Links