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 Post subject: Disabling USB Legacy Support from OS level
PostPosted: Mon Jul 29, 2019 1:28 am 
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Joined: Fri Jul 19, 2019 1:03 pm
Posts: 3
Hello!
Wiki says that USB Legacy Support must be disabled by OS as soon as it initializes USB controller.
But how to do it?


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 Post subject: Re: Disabling USB Legacy Support from OS level
PostPosted: Mon Jul 29, 2019 11:02 pm 
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Joined: Thu May 17, 2007 1:27 pm
Posts: 705
That depends on the controller. UHCI has a simple register to disable SMI generation, while EHCI and XHCI have a semaphore to communicate with the firmware. Check the data sheets.

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managarm: Microkernel-based OS capable of running a Wayland desktop (Discord: https://discord.gg/7WB6Ur3). My OS-dev projects: [mlibc: Portable C library for managarm, qword, Linux, Sigma, ...] [LAI: AML interpreter] [xbstrap: Build system for OS distributions].


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