Note that should should be interpreted to mean a recommendation and not a requirement on an implementation. The image should be stored in EfiBootServicesData, allowing the system to reclaim the memory when the image is no longer needed.

The Image Address contains the location in memory where an in-memory copy of the boot image can be found.

So where is this image sorted in memory? Quoting from section 5.2.22.4 of the ACPI 5.0 specification: This table is only supported on UEFI systems.ĭo not expect to find this table on UEFI firmware that is older than 2010. by a key press), the valid bit within the status field should be changed to 0 to indicate to the OS that the current image is invalidated.

This should be done after it is expected that any firmware components that may write to the screen are done doing so and it is known that the image is the only thing on the screen. The table is written when the image is drawn on the screen. The Boot Graphics Resource Table (BGRT) is an optional table that provides a mechanism to indicate that an image was drawn on the screen during boot, and some information about the image. Quoting from section 5.2.22 of that specification: To fully understand the BGRT, you need to read the ACPI specification, version 5. This is something that with a second PC (used to download stuff and create boot media) can be repaired with a little work.

If that is the case, the Windows OS is still there but you can not boot to it and the PC does not see the OS, as a result. Enjoy low prices and great deals on the largest selection of everyday essentials and other products, including fashion, home, beauty, electronics, Alexa Devices, sporting goods, toys, automotive, pets, baby, books, video games, musical instruments, office supplies, and more. BCDEdit and modify the Boot Graphics Resource Table (BGRT). First, the boot loader records could have become corrupted. Get the best of Shopping and Entertainment with Prime. In this post, I show you how to access the ACPI 5.0 Boot Graphics Resource Table (BGRT) from the UEFI shell and how to save a copy of that boot graphic, usually an OEM logo, in BMP format to disk. Im getting MSI logo with the circle booting up which made me think I can change or put my.

Boot graphics resource table