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  Topic : [Problem]UEFI or Legacy BIOS? New Topic
batagy
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Posts : 12
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Tech Points : 9
From: Hungary
Posted:11/15/2012 5:57:00 PM # 1
Hi!

1. How do I know whether my system boots with Legacy Bios or with new UEFI? Currently the old black Amibios screen is starting up first, so I guess it's the old Legacy BIOS?

2. Actually the manual mentions a setting in BIOS here:
Boot Menu -> "UEFI/Legacy Boot" , and the default value according to guide is "Enable both UEFI and Legacy".
However this menu item is not existing in the BIOS! At least not in latest 1003 version! Where is this setting gone?

Thanks in advance!

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Ulrich
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From: United States
Posted:11/16/2012 12:25:00 AM # 2
Hi b..

The boot options you refer to don't affect what you see on the screen.. they affect certain hardware and software that may be installed on or loaded into the system..

http://docs.oracle.com/cd/E20881_01/html/E20891/gltde.html

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There are 10 kinds of people in the World...Those who understand binary, and those who dont!
batagy
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Posts : 12
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Tech Points : 9
From: Hungary
Posted:11/16/2012 4:59:00 AM # 3
Hi,

Well, not sure you are right.
I think the setting should matter, only that I don't understand why is that setting is missing.

From above link, the last 2 sentences seems to be the important:
  • When an operating system is installed using Legacy BIOS boot mode, the operating system can be started only in Legacy BIOS boot mode.

  • When an operating system is installed using UEFI boot mode, the operating system can be started only in UEFI boot mode.

So, it seems for me, the OS should be installed in UEFI mode, if I want to use UEFI mode, and later this cannot be changed. I understand this, but how should I select only UEFI mode if the setting isn't in BIOS.


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Hiker
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From: Sweden
Posted:11/16/2012 5:11:00 AM # 4
Hi batagy,

Have looked under CSM (Boot menu)?

Btw, it's not necessary to limit boot to UEFI only.

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ASUS Z97-WS (BIOS 1204) -- Intel i7-4790K -- Noctua NH-U12P SE2 -- 16GB (2x8GB) Corsair Vengeance Pro 1866MHz 9-10-9-27 2T 1.5V -- iGPU -- System drive RAID 0 on 2x120GB Intel SSD 520 (6Gbs), storage on RAID 1, 2x250GB/16MB Seagate Barracuda 7200.10 SATA2, additional storage 1x250GB/16MB -- DVD-RW ASUS DRW-24F1ST -- all drives on Intel Z97 controller -- Antec P180B -- Corsair HX750 PSU -- Win7 Ultimate x64 SP1 -- Chipset Device Software 10.0.14 -- IRST 13.2.4.1000 -- UEFI/CSM, SSDs and HDDs GPT partition formatted -- IE11
batagy
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Posts : 12
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Tech Points : 9
From: Hungary
Posted:11/16/2012 7:04:00 AM # 5
Hi Hiker!

Yeah, you hit the nail!!!
There is everything under the CSM menu!

So here is the menu list in Advanced Mode:
Boot -> CSM -> Launch CSM: This has "Auto" value by default. Once we set it to "Enabled", then 4 new menu items appear in the CSM menu:
  • Boot Device Control:
    • UEFI and Legacy OpROM
    • Legacy OpROM only
    • UEFI only
  • Boot from Network Devices (I didn't listed the values here but similar)
  • Boot from Storage Devices:
    • Both, Legacy OpROM first
    • Both, UEFI first
    • Legacy OpROM first
    • UEFI driver first
    • Ignore
  • Boot from PCIe/PCI Expansion Devices (I didn't listed the values but similar)

So the options are there! Thanks a lot.

I know that it's not necessary to limit to UEFI only, but wanted to see the options.


Another thing that is totally new to me and just discovered them, the followings:

  • When an UEFI boot capable media is inserted, for example Win8 install DVD is in optical drive, in Boot menu there are double items of the same thing, one is the old Legacy entry, and there is a second UEFI entry of the same. And for installing in UEFI mode, the UEFI entry should be selected!
  • Second important thing to know, when installing in UEFI mode, the disk must be formatted in GPT mode, and not in MBR mode! So the disk should be converted to GPT format before installing in UEFI mode. The GPT mode needs to create 2 special small partitions on disk, before the normal first primary partition begins.

Both above requirement, were not known for me previously, and I installed Win8 and OpenSUSE12.2 from the legacy entries, and obviously I installed to MBR disk. Hence my system is not in UEFI mode.

I have taken the infos from below links, especially the first link is very useful:

http://info-coach.fr/pc/hardware/AsusP8P67/Asus-UEFI.php

http://www.eightforums.com/tutorials/2328-uefi-unified-extensible-firmware-interface-install-windows-8-a.html

http://tech.isatya.in/post/18601357171/installing-windows-8-consumer-preview-in-uefi-mode-in

http://technet.microsoft.com/en-us/library/hh825112.aspx

http://forums.opensuse.org/english/get-technical-help-here/install-boot-login/478260-trouble-dual-booting-12-2-windows-7-efi-enabled-system.html


That seems I need to install everything again in UEFI mode. Additional trouble that I want to install Win8 and OpenSUSE 12.2 to same disk, and as I read, the OpenSUSE installer is buggy on that matter, see last link above.


Regards

György

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Hiker
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From: Sweden
Posted:11/16/2012 7:42:00 AM # 6
Hi batagy,

There is a guy by the name of Sean Webster, who has put a lot of work on these matters.

Here's a couple of links that might be of some help:
Windows 7
http://www.overclock.net/t/1156654/seans-windows-7-install-optimization-guide-for-ssds-hdds

Windows 8
http://www.overclock.net/t/1240779/seans-windows-8-install-optimization-guide-for-ssds-hdds

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ASUS Z97-WS (BIOS 1204) -- Intel i7-4790K -- Noctua NH-U12P SE2 -- 16GB (2x8GB) Corsair Vengeance Pro 1866MHz 9-10-9-27 2T 1.5V -- iGPU -- System drive RAID 0 on 2x120GB Intel SSD 520 (6Gbs), storage on RAID 1, 2x250GB/16MB Seagate Barracuda 7200.10 SATA2, additional storage 1x250GB/16MB -- DVD-RW ASUS DRW-24F1ST -- all drives on Intel Z97 controller -- Antec P180B -- Corsair HX750 PSU -- Win7 Ultimate x64 SP1 -- Chipset Device Software 10.0.14 -- IRST 13.2.4.1000 -- UEFI/CSM, SSDs and HDDs GPT partition formatted -- IE11
batagy
Member
Posts : 12
Level :
Tech Points : 9
From: Hungary
Posted:11/16/2012 4:02:00 PM # 7
Hi Hiker,

Many thanks, that link is really useful stuff!

One thing for sure to decide, whether I really need all native UEFI boot mode or not. Because everything works in old Legacy way also, and seems GPT disks can have issues if something goes wrong.

I'm only interested because the boot process maybe faster if booting in UEFI mode. Is that true?

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Hiker
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From: Sweden
Posted:11/16/2012 6:13:00 PM # 8

Quote:
Author: batagy Posted: 11/16/2012 4:02:00 PM

I'm only interested because the boot process maybe faster if booting in UEFI mode. Is that true?

Hi,

I can't really say from my own experience. I changed from one SSD (Intel 520, 120GB) to two of those in a RAID 0 and formatted GPT. At the same time, I also went for the UEFI driver - all mainly to get familiar with this technique. The reading speed now max out at 1070-1080 MB/s (ATTO), which is very close to the doubled speed for that of one drive.

Of course the boot time is fast, but what the main reason for that is I can't say, since I changed more than one thing at the same time.

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ASUS Z97-WS (BIOS 1204) -- Intel i7-4790K -- Noctua NH-U12P SE2 -- 16GB (2x8GB) Corsair Vengeance Pro 1866MHz 9-10-9-27 2T 1.5V -- iGPU -- System drive RAID 0 on 2x120GB Intel SSD 520 (6Gbs), storage on RAID 1, 2x250GB/16MB Seagate Barracuda 7200.10 SATA2, additional storage 1x250GB/16MB -- DVD-RW ASUS DRW-24F1ST -- all drives on Intel Z97 controller -- Antec P180B -- Corsair HX750 PSU -- Win7 Ultimate x64 SP1 -- Chipset Device Software 10.0.14 -- IRST 13.2.4.1000 -- UEFI/CSM, SSDs and HDDs GPT partition formatted -- IE11
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