Re: port-macppc/58320: NetBSD/macppc 10.0 INSTALL kernel stalls onPower Mac G4

["Izumi Tsutsui via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR port-macppc/58320; it has been noted by GNATS.

From: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: tsutsui%ceres.dti.ne.jp@localhost
Subject: Re: port-macppc/58320: NetBSD/macppc 10.0 INSTALL kernel stalls onPower
	 Mac G4
Date: Tue, 29 Apr 2025 20:20:45 +0900

 martin@ wrote via gnats:
 
 >  On Mon, Apr 28, 2025 at 07:50:02PM +0000, Izumi Tsutsui via gnats wrote:
 >  >  2) set up "ofw_battable[]" for OF functions (which is currently empty)
 >  >     properly, at least for PCI framebuffers
 >  >     (not sure which regions are actually necessary for the fb ops though)
 >  
 >  This all is very tricky, the best solution is to not call OF functions
 >  "later" in the kernel, especially anything that could trigger changes
 >  in mappings. For other functions we could merge the OF entries with the
 >  kernel entries and keep them alive.
 >  
 >  Can the palette stuff be done before we take over the MMU?
 
 On macppc (with sys/arch/powerpc/oea/ofw_consinit.c) it doesn't
 look to support early console detection at least for displays.
 
 The cnattach functions are called during configure(9) and
 Openfirmware console functions are used until genfb(4)
 (or other PCI framebuffer drivers) are attached, like
 sparc ports.
 
 ---
 Izumi Tsutsui