here a short update of the hardware test results (the 3.17 kernel git is updated accordingly trying to make things work).
First, let's start with what has already been tested and is working fine:
• Keyboard-Backlight LEDs • Shoulder Buttons • Nub buttons • Nubs (Position etc.) • Keyboard • Sensor: BMP180 (digital barometric pressure sensor) • DC/DC-Converter for the USB-Hosts ports • magnetic lid detector
Not yet tested:
• RGB-LEDs
have been fixed (hardware issue). Just one flaw: the red LEDs glow a little even if turned off. We need to rewrite the tca6424 driver so that gpios can be configured as "open drain" outputs: http://projects.goldelico.com/p/gta04-kernel/issues/658/
• Stresstest VBUS
the vbus voltage breaks down at ~11 Ohm load which means 450 mA. This is a little lower than expected and required (should be at least 500 mA - better 1A). vbus can be turned on/off through GPIOs. The next version of the main board will indicate over-current (either through red LEDs and/or GPIOs)
• Microphone-Detect-Switch
the TS3A225E works fine if accessed through I2C. A new test script is here: http://git.openpandora.org/cgi-bin/gitweb.cgi?p=pyra-kernel.git;a=commit;h=3... It even sends the mic_present signal to the TCA6424 which even raises the INT GPIO (can be checked by exporting it and reading from /sys). But the kernel does not handle changes as IRQ and they don't arrive in the extcon-gpio driver as expected.
• CPU-Reset-Logic (LSH-BOTTOM + Poweron)
this circuit is broken and needs to be redesigned.
• Charger-Bypass
works (except some insignificant issue which can be solved later - if at all).
• FTDI232 (Linux console)
responds on the USB side.
• Charger
the charger chip behaves sane and expected (as far as it could be tested without real battery and system consuming high energy). A preliminary I2C driver for the bq2429x has been added. But the charger should also work without driver.
• Vibration motor, Microphone, Speakers
not yet tested.
• Modem-USB, Modem-Ignite, GPS
not yet tested (was already tested in the previous design except GPS and new functions like new SIM card reader).
• INA231 (for checking modem status/power)
a hardware issue prevents complete test.
• Fuel Gauge(s)
bq27200 responds but delivers unreasonable values. bq27421 does not respond.
• Other sensors
Can't be tested yet (as we need the CPU-Board and/or the next revision of the motherboard: • HDMI • eSATA • USB-OTG 2/3 • Audio • WLAN/BT • Display connected to the mainboard
More tests to be done beginning of next week. And I have not yet continued to develop/test the Displays.
BR, Nikolaus