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Acer C720P Core i3 + Patched BIOS progress


coolstarorg
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Specs:

 

CPU: Intel Core i3-4005U

Chipset: Lynx-Point

RAM: 4 GB DDR3

GPU: Intel HD 4400 Graphics (PCI ID 8086:0a16)

Audio: Realtek ALC283

WiFi: Atheros AR9462 (although I have a USB Edimax EW-7811un I can use)

SSD: 128 GB

 

Keyboard is PS2. Trackpad & Touch Screen are on I2C bus.

 

Changes applied to coreboot BIOS:

1. USB routed to EHCI bus at cold boot and routed to XHCI via ACPI in _OSC. This gets Clover, OS X and Windows 8/10 booting properly from USB

2. The Intel ME device has been re-enabled (PCI ID 8086:9C3A)

3. I2C Controllers were switched from PCI mode to ACPI mode so they work correctly in Windows.

4. DSDT Patches for Battery so battery status works correctly in Windows and OS X

 

Bootloader used: SeaBIOS + Clover EFI

 

I'm trying to run OS X 10.10.5.

 

Kexts Used:

1. VoodooPS2Controller

2. VoodooBattery

3. FakeSMC

4. ACPIBacklight

 

Currently OS X is able to boot to the installer. However, there doesn't appear to be any graphics acceleration as there's noticeable tearing :/

 

Keyboard is dead, as well as touchpad and touch screen (last 2 expected due to I2C but keyboard is PS2).

 

Haven't verified Audio yet as I haven't installed yet but I'd like to get graphics acceleration and audio working.

 

I have attached a screenshot of device manager on my C720P so you can see I indeed have the MEI device enabled.

post-1358479-0-02238200-1449864006_thumb.png

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  • 2 weeks later...

Thanks to TheRacerMaster's suggestion I tried CodecCommander with the ALC283 patch that was already there on the github. Worked a charm, headphone sound quality is fixed :D


Fixed SMBIOS entries for the RAM, which got OS X 10.11 El Capitan's kernel running.

 

Then created a USB injector to get the USB ports working in El Capitan and we now have OS X 10.11.2 running on the C720 chromebook  :D

 

 

For my Mediatek USB wifi (I upgraded to a new one with 802.11ac), had to use Pacifist to extract and manually install the 10.10 kext but it's working :)

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  • 2 weeks later...
  • 7 months later...

Thanks to TheRacerMaster's suggestion I tried CodecCommander with the ALC283 patch that was already there on the github. Worked a charm, headphone sound quality is fixed :D

Fixed SMBIOS entries for the RAM, which got OS X 10.11 El Capitan's kernel running.

 

Then created a USB injector to get the USB ports working in El Capitan and we now have OS X 10.11.2 running on the C720 chromebook  :D

 

 

For my Mediatek USB wifi (I upgraded to a new one with 802.11ac), had to use Pacifist to extract and manually install the 10.10 kext but it's working :)

 

Has there been a USB enable for the Dell Chromebook 11's implemented anywhere?  Doesn't appear so from searching around, but I figured it was worth asking.

 

Great work on this front, coolstar.

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