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+ postmarketOS
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+asus grouper (Google Nexus 7 2012)
+Contributors
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- antonok +
What works
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- Boot process +
- Telnet/SSH over USB +
- Screen +
- USB keyboard, mouse +
- Touchscreen +
What does not work
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- weston-keyboard +
- Wifi + other untested parts +
How to enter flash mode
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- Connect a USB cable +
- Power the device off +
- Hold power + volume down +
fastbootshould work when the green android appears on the screen
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Notes
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- I am using the LineageOS kernel found here +
- The kernel cannot be compiled on versions of gcc newer than 4.9 without a patch, found here +
- I could not get UART debugging through the headphone jack to work - as far as I can tell, the 2012 version of the Nexus 7 does not have this feature. +
- CONFIG_VT had to be enabled for graphics to work. In menuconfig this is located under Device Drivers -> Character devices -> Virtual terminal. +
- /sys/class/graphics/fb0/mode is empty on boot, it must have U:800x1280p-0. This uses the same initfs hook as many other devices. +
- xwayland does not work. +
- weston with fbdev-backend.so uses pixman-type=3 (PIXMAN_TYPE_ABGR), which now does not require configuration. +
- The touchscreen input device is named
elan-touchscreen.
+ - The wifi chip is the Broadcom 4330. +
- This device was once officially supported on Ubuntu, so it has a firmware package in the Ubuntu repositories. +
Image
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Fun fact: grouper is the first tablet to run pmOS!