28 Mar
2013
28 Mar
'13
8:55 p.m.
Message: 18
Date: Tue, 26 Mar 2013 13:31:59 +0800
From: Simon Wise <simonzwise(a)gmail.com>
To: linux-audio-user(a)lists.linuxaudio.org
Subject: Re: [LAU] How to turn off hyperthreading?
Message-ID: <515132CF.4010901(a)gmail.com>
Because UEFI is designed to prevent hardware being booted unless it is
into an unmodified and signed OS version
You are confusing UEFI, SecureBoot[TM], and Microsoft requirements
concerning implementations of certain options.
I have booted unsigned operating systems plenty of times on a UEFI system.
and this hardware lock can be set up so it cannot be
turned off
That would refer to a particular implementation of SecureBoot, which is an
optional part of UEFI. Not every system with UEFI necessarily supports
UEFI, most which do allow you to disable.
For intel devices microsoft does not require UEFI to
be set so it
can't be turned off, for non-intel tablets it does. So Linux is
locked out of any such devices.
So don't buy ARM tables with Windows-RT on them.
and be very cautious of UEFI on any device since it
means you no longer
have control of hardware you thought you had bought and now own.
Not true at all. UEFI is just a specification for a boot environment. It
has a lot of cool features and is a lot more flexible than legacy BIOS.
If you are concerned that the secure boot feature might be locked down,
just make sure to ask whether secure boot can be disabled and how key
management is handled if you are considering buying a device with UEFI.
--
Chris Caudle