[Bug 254381] bootloader is very slow

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 14 Feb 2024 06:11:41 UTC

Jung-uk Kim <jkim@FreeBSD.org> changed:

           What    |Removed                     |Added
           Severity|Affects Only Me             |Affects Some People
                 CC|                            |jkim@FreeBSD.org

--- Comment #11 from Jung-uk Kim <jkim@FreeBSD.org> ---
I have a similar problem.  My guess is the frame buffer does not set memory
attribute properly.  Note we do not have this problem as soon as kernel is
loaded because we unconditionally set it as write-combining:


Later, we added "hw.efifb.cache_attr" tunable to allow uncacheable type.


We may be able to set it from loader via SetVirtualAddressMap(), I guess?

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