boot loader

randy lxr1234 at hotmail.com
Fri Feb 28 18:48:29 UTC 2014


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  2014 02 28  15:24, Denis 'GNUtoo' Carikli wrote:
> On Sat, 22 Feb 2014 12:13:47 -0800 Blibbet <blibbet at gmail.com>
> wrote:
> 
>>> This is kinda hard to say. I've heard that on x86, it is
>>> possible that the BIOS keeps executing code even after it
>>> started the system, so perhaps something like that can happen
>>> too.
>> 
>> UEFI remains running while the loaded OS runs. The OS (and apps)
>> can communicate with EFI.
>> 
>> EFI is a complex standalone realtime embedded event-driven OS,
>> not just a simplistic firmware/loader.
>> 
>> EFI has "Runtime Services" which can communicate with the OS
>> (Linux, Windows, etc.). The main one is for accessing variables
>> (like environment variables). Others OS vendors or OEMs or
>> firmware vendors can add other runtime services. For example, I
>> believe (unconfirmed) that Apple moved some of their OSX DRM code
>> into an EFI runtime service.
One thing I know about Mac OS's efi is that the efi is different to
most of UEFI in x64 platform as it is a 32bit efi.
Malware authors can write EFI runtime service drivers and --
>> if they can install them on your system -- you'll have a hard
>> time determining it is there.
> flashrom -p <some_external_programmer> -r efi.bin Then analyse
> that, but I don't think it's worth the time.
> 
When I was tring to add SLIC to UEFI, is there a way to add SLIC
module permanently even you want to update UEFI later, I wonder how
does it achieved.

thank you
ayaka
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