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Re: usb_keyboard not available as a terminal input?

From: Andrei Borzenkov
Subject: Re: usb_keyboard not available as a terminal input?
Date: Mon, 22 May 2017 06:39:12 +0300
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21.05.2017 21:41, Ineiev пишет:
> On Sun, May 21, 2017 at 08:39:09PM +0300, Andrei Borzenkov wrote:
>>> I tried `insmod ehci` anyway. Interestingly, the grub environment is sort 
>>> of broken after that, because the disk is gone after the insmod command. 
>>> Like, before that if I `ls`, it shows "(hd0), (hd0, gpt1), (hd0, gpt2), 
>>> (hd0, gpt3)"; and after that if I `ls`, it prints a blank new line. (I am 
>>> on a system that has one single drive which is a USB drive).
>> Which is correct. Loading direct hardware drivers disables native
>> platform drivers.
>>> It seems to me like if I load ehci, the current host controller driver is 
>>> replaced so grub can no longer see the USB drive it is on. However there is 
>>> not an "xhci" module, so I wonder what was being replaced.
>>> And if my assumption is true, why would usb_keyboard not work while the 
>>> storage drive works?
>> Because storage driver is using UEFI services by default (or in general
>> on every platform grub prefers using native firmware to access devices).
>> Why do you need usb_keyboard in the first place? Does native UEFI
>> console access not work for you?
> Coincidentally, I'd like to extend the protocol of usb_keyboard; most
> probably, native firmware won't do. is there any documentation about
> what modules are needed (no, I don't use USB drives)?

If you do not use USB drivers you cannot use usb_keyboard either.

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