Discussion:
How to know if system running in UEFI boot mode?
(too old to reply)
Johny
2009-11-11 14:58:16 UTC
Permalink
Dear All,

Is there any API or registry item can indicate if system is running in UEFI
boot mode or BIOS boot mode ?

When install system on Dell PowerEdge 710, user can select BIOS boot mode or
UEFI boot mode. My question is, when windows system is started, how to know
if it is running in UEFI boot mode or BIOS boot mode.

Thanks in advance.

Thanks
Don Burn
2009-11-11 15:17:16 UTC
Permalink
Why would you care once the OS is up?
--
Don Burn (MVP, Windows DKD)
Windows Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr
Remove StopSpam to reply
Post by Johny
Dear All,
Is there any API or registry item can indicate if system is running in
UEFI boot mode or BIOS boot mode ?
When install system on Dell PowerEdge 710, user can select BIOS boot mode
or UEFI boot mode. My question is, when windows system is started, how to
know if it is running in UEFI boot mode or BIOS boot mode.
Thanks in advance.
Thanks
__________ Information from ESET NOD32 Antivirus, version of virus
signature database 4596 (20091111) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
__________ Information from ESET NOD32 Antivirus, version of virus signature database 4596 (20091111) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com
oren murray
2011-02-15 18:40:24 UTC
Permalink
He probably has reasons, you homosexual.
Post by Johny
Dear All,
Is there any API or registry item can indicate if system is running in UEFI
boot mode or BIOS boot mode ?
When install system on Dell PowerEdge 710, user can select BIOS boot mode or
UEFI boot mode. My question is, when windows system is started, how to know
if it is running in UEFI boot mode or BIOS boot mode.
Thanks in advance.
Thanks
Post by Don Burn
Why would you care once the OS is up?
--
Don Burn (MVP, Windows DKD)
Windows Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr
Remove StopSpam to reply
__________ Information from ESET NOD32 Antivirus, version of virus signature database 4596 (20091111) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
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oren murray
2011-02-15 18:42:01 UTC
Permalink
He probably has reasons, you homosexual.
Post by Johny
Dear All,
Is there any API or registry item can indicate if system is running in UEFI
boot mode or BIOS boot mode ?
When install system on Dell PowerEdge 710, user can select BIOS boot mode or
UEFI boot mode. My question is, when windows system is started, how to know
if it is running in UEFI boot mode or BIOS boot mode.
Thanks in advance.
Thanks
Post by Don Burn
Why would you care once the OS is up?
--
Don Burn (MVP, Windows DKD)
Windows Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr
Remove StopSpam to reply
__________ Information from ESET NOD32 Antivirus, version of virus signature database 4596 (20091111) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
Post by oren murray
He probably has reasons, you homosexual.
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Pico Ohms
2011-04-04 11:28:49 UTC
Permalink
I had the same question today as we're looking at writing our boot modules. Based on this document:

http://www.uefi.org/events/UEFI-Plugfest-WindowsBootEnvironment.pdf

You should be able to use "bcdedit /enum" to enumerate the BCD settings. Under "Windows Boot Loader", you'll see a path description "\Windows\system32\winload.efi" if the system is booting from EFI mode.
Post by Johny
Dear All,
Is there any API or registry item can indicate if system is running in UEFI
boot mode or BIOS boot mode ?
When install system on Dell PowerEdge 710, user can select BIOS boot mode or
UEFI boot mode. My question is, when windows system is started, how to know
if it is running in UEFI boot mode or BIOS boot mode.
Thanks in advance.
Thanks
Post by Don Burn
Why would you care once the OS is up?
--
Don Burn (MVP, Windows DKD)
Windows Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr
Remove StopSpam to reply
__________ Information from ESET NOD32 Antivirus, version of virus signature database 4596 (20091111) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
Post by oren murray
He probably has reasons, you homosexual.
Post by oren murray
He probably has reasons, you homosexual.
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