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MdeModulePkg: UefiBootManagerLib Change default alignment for ramdisk. #11029

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@apop5 apop5 commented May 2, 2025

Description

The ramdisk is modelled as an NVDIMM which have a naturally higher alignment than 4K. Operating systems may wish to map NVDIMMs using large pages, so force the allocation alignment to 2MB.

  • Breaking change?
  • Impacts security?
  • Includes tests?

How This Was Tested

Testing using HTTP ramdisk boot, targeting a windows image.

Integration Instructions

No integration necessary.

… boot.

The ramdisk is modelled as an NVDIMM which have a naturally higher
alignment than 4K. Operating systems may wish to map NVDIMMs using large
pages, so force the allocation alignment to 2MB.

This change was tested using HTTP ramdisk boot, targeting a flat windows
image.

Signed-off-by: Aaron Pop <[email protected]>
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