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AMD memory map fixes #189

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AMD memory map fixes #189

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miczyg1
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@miczyg1 miczyg1 commented Nov 23, 2024

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There was a dirty hack for Intel platforms that read TOLUD register
to determine the boundary between MMIO and DRAM. It caused problems
on AMD platforms such as apu2, which does not have TOLUD register. As
a result, regions which held reserved memory were incorrectly
reported as RAM buffers or RAM itself and the OS allocated DMA there.
It could be observed with many IO_PAGE_FAULTs occurring in the OS.
See: Dasharo/dasharo-issues#1134

Signed-off-by: Michał Żygowski <[email protected]>
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