4. Improving the boot
experience

7. Service & App
POST OS Initialization
Initialization
Service &
POST
App Init

8. Post with highest supported Seamless single graphics
native resolution transition from firmware to
Clean, high-resolution branding native OS driver
elements persist through OS boot
OEM OEM
Logo Logo
Device
POST Hiber Resume Explorer Init.
Init.
2s 4s 6s 7s

10. Enhancing security

12. POST Windows
Logon
Early Launch
Firmware BootMgr Boot Critical NTOS Kernel Anti-malware
OK? OK? Drivers OK? OK? (ELAM)
Last Resort
Secure Boot
UEFI
Remediation / Factory Reset
Recovery?
Recovery
Enterprise PXE
External media
Contact Support
Firmware Last
Resort Reboot

14. Design guidance

15. Windows OS
BIOS UEFI Win32/NT APIs
UEFI OS Loader OS Loader ACPI Driver
UEFI Runtime Services
Compatibility Support Module (CSM)
ACPI ACPI
Legacy BIOS ACPI BIOS
Registers Tables
Platform Specific UEFI Firmware
Firmware
System Hardware

16. Interface Legacy BIOS UEFI
Architecture x86 / X64 only Agnostic
Mode 16 bit (real mode) 32/64 bit
Boot Partition MBR (2.2 TB limit) GPT (9.4 ZB* limit)
Runtime Services No Yes
Driver model No Yes
POST Graphics VGA Graphical Output Protocol
(GOP)
* A zettabyte is equal to 1B terabytes. The total amount of global data was expected to pass 1.2 ZB sometime during 2010.

18. Recap

20. http://forums.dev.windows.com
http://bldw.in/SessionFeedback

22. http://www.uefi.org/
http://www.trustedcomputinggroup.org/
http://www.tianocore.sourceforge.net
http://msdn.microsoft.com/en-
us/windows/hardware/gg463149
http://msdn.microsoft.com/
http://www.intel.com/intelpress/sum_efi.htm

23. BACKUP

27. 38.2% from top to middle of logo
Max 40%
Max 40%
This space reserved for OS