coolstarorg Posted December 11, 2015 Share Posted December 11, 2015 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. 1 Link to comment https://www.insanelymac.com/forum/topic/309819-acer-c720p-core-i3-patched-bios-progress/ Share on other sites More sharing options...
coolstarorg Posted December 11, 2015 Author Share Posted December 11, 2015 Just checked system information. It says no kext loaded in the installer. Do graphics kexts load in the installer or do I have to install it first to verify that graphics acceleration is working? Here is a picture of the screen in System Information in the installer Link to comment https://www.insanelymac.com/forum/topic/309819-acer-c720p-core-i3-patched-bios-progress/#findComment-2196131 Share on other sites More sharing options...
coolstarorg Posted December 12, 2015 Author Share Posted December 12, 2015 Got the keyboard working. Turned out the issue was my GGL0303 device in the DSDT (which fixed the keyboard in Windows) but apparently broke it in OS X. Graphics is working with QE/CI with FakePCIID. Link to comment https://www.insanelymac.com/forum/topic/309819-acer-c720p-core-i3-patched-bios-progress/#findComment-2196179 Share on other sites More sharing options...
coolstarorg Posted December 12, 2015 Author Share Posted December 12, 2015 Audio is working with AppleHDA_ALC283.kext Used my Edimax EW-7811un to get wifi. Link to comment https://www.insanelymac.com/forum/topic/309819-acer-c720p-core-i3-patched-bios-progress/#findComment-2196409 Share on other sites More sharing options...
coolstarorg Posted December 13, 2015 Author Share Posted December 13, 2015 ok, built in Speakers are working fine but headphone jack has noticeable issues with audio quality. Sound from headphones sounds robotic and distorted :/ Link to comment https://www.insanelymac.com/forum/topic/309819-acer-c720p-core-i3-patched-bios-progress/#findComment-2196549 Share on other sites More sharing options...
quinielascom Posted December 13, 2015 Share Posted December 13, 2015 Is the Intel MEI really needed in OSX? In others OS this feature is managed by the bios (vpro or something) and it is meant for networking proposes or i am wrong? Anyway good progress, but my chromebook is a celeron one. Link to comment https://www.insanelymac.com/forum/topic/309819-acer-c720p-core-i3-patched-bios-progress/#findComment-2196694 Share on other sites More sharing options...
TheRacerMaster Posted December 17, 2015 Share Posted December 17, 2015 ok, built in Speakers are working fine but headphone jack has noticeable issues with audio quality. Sound from headphones sounds robotic and distorted :/ Might need CodecCommander. Nice work BTW. 1 Link to comment https://www.insanelymac.com/forum/topic/309819-acer-c720p-core-i3-patched-bios-progress/#findComment-2198377 Share on other sites More sharing options...
coolstarorg Posted December 19, 2015 Author Share Posted December 19, 2015 Update: Trackpad is now working in OS X. Ported over my Windows driver for the trackpad and built it on top of VoodooI2C. Link to comment https://www.insanelymac.com/forum/topic/309819-acer-c720p-core-i3-patched-bios-progress/#findComment-2198834 Share on other sites More sharing options...
coolstarorg Posted December 31, 2015 Author Share Posted December 31, 2015 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 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 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 Link to comment https://www.insanelymac.com/forum/topic/309819-acer-c720p-core-i3-patched-bios-progress/#findComment-2202166 Share on other sites More sharing options...
bongmasterdarky Posted January 7, 2016 Share Posted January 7, 2016 will this work on a chromebook dell 11" i 3 Link to comment https://www.insanelymac.com/forum/topic/309819-acer-c720p-core-i3-patched-bios-progress/#findComment-2203861 Share on other sites More sharing options...
coolstarorg Posted January 20, 2016 Author Share Posted January 20, 2016 will this work on a chromebook dell 11" i 3 yes, it will. See: https://www.reddit.com/r/chrultrabook/comments/405nqs/bios_update_for_haswell_chromebooks/for the latest version of my BIOS. Link to comment https://www.insanelymac.com/forum/topic/309819-acer-c720p-core-i3-patched-bios-progress/#findComment-2208468 Share on other sites More sharing options...
alfonzotan Posted September 5, 2016 Share Posted September 5, 2016 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 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 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. Link to comment https://www.insanelymac.com/forum/topic/309819-acer-c720p-core-i3-patched-bios-progress/#findComment-2274204 Share on other sites More sharing options...
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