https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238730
Mark Millard <marklmi26-f...@yahoo.com> changed:
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--- Comment #10 from Mark Millard <marklmi26-f...@yahoo.com> ---
(In reply to Dennis Clarke from comment #0)
. . .
> set usefdt=1
. . .
Avoid usefdt=1 . It is known to be wrong and not work.
Unless something roughly equivalent to my patches that
were listed in:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233863
are in place, the following apply for usefdt=1 :
A) hrowpic.c uninorth.c openpic.c all need to be
corrected for at least one of OF_xref_from_node
or OF_node_from_xref use. (Pure FreeBSD issue.)
B) FreeBSD choose to truncate large nodes but Apple
has nodes that are truncated and so information
is not preserved in such cases. (Pure FreeBSD
issue as far as I can tell. I do not claim to
know the detailed conequences of the truncations:
I choose to preserver information.)
C) The translation to fdt avoided /memory0/available
information being used (and respected). The need to
resepct the information was demonstrated on the
iMac G3. (Pure FreeBSD issue as far as I can tell.)
D) The FreeBSD code for the powerpc64 Macs expects
fixed child/sibling relationships in the openfirmware
nodes (instead of always searching) but usefdt
reverses the ordering of the siblings (and so changes
what is the the first child of a node that has
childern). (Either side could be changed to avoid
the mismatch. I choose the conversion to fdt
preserving order.)
E) Apple made some of its own rules in its supposed
OpenFirmware implemenation, violating the
standard. Avoiding information loss for such (without
messing up handling of standards-conformant contexts),
requires changes. (There is no way Apple will fix
things now. So handling the oddities vs. not is a
matter of choice for FreeBSD.)
F) There was also an issue for filling translations[]
from trans_cells[] that I ran into, but I no longer
remember if the Macs would actually see the problem
if other things were corrected and made tolerant
of Apple's OpenFirmware node oddities.
[None of (A)-(F) addresses the stuck-sleeping processes
that lead to the fans going fast and the like. I've Mac
specific changes for that (that is only active on Macs).
But the changes are not bugzilla anywhere.]
I expect that Justin and company are only intending on
the default lack of usefdt as what they are enabling, at
least for now. So if you specify a context with usefdt=1
I do not expect it to get much attention (for now).
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