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Windows 7: Understand UEFI and CSM BIOS setting for ASUS H97-Plus

22 Dec 2014   #1

Win 7 Pro x32
Understand UEFI and CSM BIOS setting for ASUS H97-Plus

I don't know if anyone has tried to contact ASUS support but impossible. FWIW sorry I went with this ASUS board but from reading ASUS now makes about 80 percent of all boards. Hope we can get some competition from the good ole USA and show them how its done.

In discussion with American Megatrends today, found out they sell their base BIOS to MOBO manufacturers and then the BIOS manufacturers modify it to their liking. IMHO, who modified this BIOS for ASUS must of had a nightmare the night before.

I found two numbers for this BIOS.
I "think" they relate to each company as follows:
-- ASUS ver 2202
-- American Megatrends ver. 2.16.1240

=========== My Questons ===================

1) If someone has this board and BIOS can they explain to me when I should set the CSM for UEFI when running Windows 7?
2) My BIOS shows Boot Secure Enabled but I can't figure out how to turn it off and this "Secure Boot" choice cannot be toggled.
Is their some setting elsewhere I need to set in order to toggle "Secure Boot"?

3) Under PCH Storage Configuation they indicate this item will automatically detect between M.2 devices and SATA devices. What are M.2 devices?

4) Under SATA Mode Selection (AHCI)
this has a setting of IDE, AHCI, and RAID. With a SATA boot drive and setting to IDE, Windows 7 will Not load. I iniitally thought that if I had a non-boot IDE drive attached that needed to be set for it (the IDE), obviously Not. Any clarification here would be helpful.

5) Regarding boot device configuration can someone confirm if my interpretation is correct.

-- UEFI and Legacy OpROM.

My guess is UEFI is the "Bios" renamed and is now called UEFI and that the OpROM (whatever that stands for) is the older traditional BIOS prior to UEFI. If I'm correct and this is UEFI "biod"why would you set OpROM in thie Bios itself? Help needed here.

-- Boot from Network Devices. How do you boot from a Network device?

-- Boot from Storage Devices. Again what do they mean by a Storage device and how does one boot from it?

-- Boot from PCIe/PCI Expansion Device. My guess here is if you have a daughter board with an IDE that installed in a PCIe or PCI slot, that one can boot from the IDE drive connected to this daughter board.

Confused and enough for now.

My System SpecsSystem Spec
23 Dec 2014   #2


Can you take pics of each BIOS screen, particularly Advanced, Security and Boot, then attach using the paper clip in Reply box? This makes it much easier to spot the correct settings. For any related to UEFI, CSM, Legacy anything, please expand them to show all available settings.
My System SpecsSystem Spec
23 Dec 2014   #3

Win 7 Pro x32


Thanks for responding.

Been working on listing with short explanations using Excel. Hopefully will finish today.

This new BIOS is NOT like the old where you could print 6 screens and have all settings.
With the way this GUI works, my guess is it would be about 100+ pics.
Hence my Excel listing.

Will post Excel file or pic of it when done -- hopefully by tonight -- and then we can go from there with pics.

My System SpecsSystem Spec

23 Dec 2014   #4


We've always been able to see in just a handful of pics the necessary menus with only CSM, Legacy BIOS, Secure Boot settings, and Reset to Defaults choices expanded. Don't expect busy volunteers to go through a spreadsheet. The visual is what is useful.

Often Secure Boot is disabled by an adjacent setting named similarly.

It may also require Reset to Defaults for Win7 or "Other OS."
My System SpecsSystem Spec
23 Dec 2014   #5

Windows 10 Pro. EFI boot partition, full EFI boot

I don't have that board, but do have an Asus.

If your are booting pure EFI mode (have your OS on a GPT disk with EFI boot partition, EFI bootloader, etc), then you want CSM disabled. If you do so however, your hardware has to support GOP/EFI, which means your Video BIOS may need updated.

For the EFI and legacy Oprom - legacy Oprom is the old MBR BIOS way of supporting device firmware. EFI is the new EFI driver way.

If you are doing the good old Master Boot Record (MBR route), then you want CSM enabled, or you won't be able to boot. Figuring out what the CSM options mean is another thing - from their names some seem redundant.

If you are booting windows and want to disable secure boot, select "other OS" for the key stuff.

You can boot from network devices by using the PXE protocol. If you have to ask....

Boot from storage device like USB, CD-ROM.

Boot from PCIe ... I don't know. Maybe a PCIe SSD drive? Or a USB expansion card with a bootable USB device plugged-in.
My System SpecsSystem Spec
23 Dec 2014   #6

Win 7 Pro x32


Don't expect busy volunteers to go through a spreadsheet
I understand. Doing a spreadsheet to get everything listed in one place and then take a each worksheet so # of pics are greatly reduced. Again as stated, you tier down in this bios so only a small handful of options show on each page.


Thanks for feedback. A lot of new terms and acronyms for me so climbing the learning curve. Hopefully listing things in Excel will not only ID common terms so I can search them but also point out what affects what.
My System SpecsSystem Spec
23 Dec 2014   #7

Win 7 Pro x32

Ok here are the Excel Pictures which detail the Advanced and Boot Options choices. There are two pics of each as had to split them in half. Comments are per manual, with verbage shortened to fit. First column of each sheet is either blank,
****, ???, or KEY. This is my annotation to flag those which may be causing my issues (*** or KEY) or those I need to do research on because I don't yet understand what the acronym used really does and how it affects whatever.

Attached Thumbnails
Understand UEFI and CSM BIOS setting for ASUS H97-Plus-adv-pic1.png   Understand UEFI and CSM BIOS setting for ASUS H97-Plus-adv-pic2.png  
Attached Images
Understand UEFI and CSM BIOS setting for ASUS H97-Plus-boot-pic1.png Understand UEFI and CSM BIOS setting for ASUS H97-Plus-boot-pic2.png 
My System SpecsSystem Spec
23 Dec 2014   #8


You must disable Secure Boot to install Win7.

Then it often requires some level of CSM to install Win7. It also often requires Other OS setting .

Boot installer as UEFI Device. You may need to disable Fast Boot to access BIOS Boot menu key, or can preset UEFI install media to boot first in BIOS Setup. Stick must be formatted with Option One of UEFI Bootable USB Flash Drive - Create in Windows and unplugged at reboot during installation if preset.

All partitions should be deleted to clear formatting. Report back any failure behavior.

Try installing to UEFI to use all features. Only if its not possible would I settle for Legacy.

Confirm you have latest UEFI firmware.
My System SpecsSystem Spec
23 Dec 2014   #9

Win 7 Pro x32

You must disable Secure Boot to install Win7.
Have Win7 installed. Just finished going out to UEFI Committee site and reading their FAQ's. Disabling Secure Boot appears to be a manufacturer decision regarding ability to disable. Mine is read only unless some other option allows it to be toggled on/off. Which one, if any is question?

Attaching a glossary for others on terms I have flagged in pics. Under UEFI you an read the FAQ statement regarding Secure boot.

Attached Files
File Type: txt Glossary.txt (4.1 KB, 27 views)
My System SpecsSystem Spec
23 Dec 2014   #10


We deal with a dozen of these a day. Every single one gets installed without need for a UEFI committee thus far. Are you writing a guide?

Are you trying to install Win7? Please follow steps given and reply interactively.

There has always been a way to turn off Secure Boot so far. We could spot it if there were pictures?

Read your mobo manual on board's Support Downloads webpage.
My System SpecsSystem Spec

 Understand UEFI and CSM BIOS setting for ASUS H97-Plus

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