UEFI boot of Win 7 setup or Win PE from USB flash drive is not working for me. Should this be possible? What happens in my case is that the Windows Boot Loader shows up saying: "Status: 0xc0000225 Info: The boot selection failed because a required device is inaccessible.".
As long as UEFI is enabled in BIOS, there should theoretically be no problems. However, if your SATA mode in BIOS is currently set to Native - AHCI, switch it to Legacy - AHCI.
For further details/assistance on UEFI integration/configuration, please, refer to following URLs:
"As long as UEFI is enabled in BIOS, there should theoretically be no problems. However, if your SATA mode in BIOS is currently set to Native - AHCI, switch it to Legacy - AHCI."
Did you mean switch it to IDE? The options for SATA on the DQ57TM board are: IDE, AHCI, RAID. If using UEFI means I can't take advantage of NCQ and RAID-readiness, then UEFI is "not yet ready for prime time".
"For further details/assistance on UEFI integration/configuration, please, refer to following URLs:
The first link was updated in 2008 so that is too old to be relevant: today Windows 7 obsoletes all previous editions of the OS.
The second link is for developers.
The third link is for manufacturers.
The fourth is also not for system builders.
Given the above, and with all the problems that pop up when UEFI and GPT-partitioned disks are used, I'd have to say that at this time UEFI is still under development and not a viable deployment option for Windows 7 desktop PCs. I've spent the good part of a week trying to get a usable Win 7 Pro 64-bit system configured, to no avail. UEFI boot from USB is just one of the problems I have encountered. Until the technology improves, the PCs I build are going out the door as MBR systems.
You wrote: "Yes, I mean AHCI."
Well, the DQ57TM has the following options: IDE, AHCI and RAID. Using IDE and giving up NCQ is not acceptable. Anyway, I gave up on UEFI and GPT for now and delivered a BIOS/MBR RAID-ready system because of all the problems encountered with UEFI/GPT. I'll look at the technology again in the next generation of desktop boards. I was trying to install Windows 7 Pro 64-bit quickly by putting it on a USB drive, but was unsuccessful.