port-macppc/54432: powerpc mac mini detects only 512MB of 1GB memory

[he%NetBSD.org@localhost]

>Number:         54432
>Category:       port-macppc
>Synopsis:       Mac mini detects only 512MB or 1GB memory
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-macppc-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 02 17:10:00 +0000 2019
>Originator:     he%NetBSD.org@localhost
>Release:        NetBSD 9.0_BETA
>Organization:
	I try...
>Environment:
System: NetBSD granny-smith.urc.uninett.no 9.0 NetBSD 9.0 (GRANNY-SMITH) #0: Fri Aug  2 14:23:09 CEST 2019  he%granny-smith.urc.uninett.no@localhost:/usr/obj/sys/arch/macppc/compile/GRANNY-SMITH macppc
Architecture: powerpc
Machine: macppc
>Description:
	One of my mac minis were recently upgraded to 9.0_BETA.
	It has a 1GB DIMM installed, but NetBSD only probes 512MB.

	The start of dmesg shows this:

NetBSD 9.0 (GRANNY-SMITH) #0: Fri Aug  2 14:23:09 CEST 2019
        he%granny-smith.urc.uninett.no@localhost:/usr/obj/sys/arch/macppc/compile/GRANNY-SMITH
total memory = 512 MB
avail memory = 482 MB
timecounter: Timecounters tick every 10.000 msec
Kernelized RAIDframe activated
found openpic PIC at 80040000
OpenPIC Version 1.2: Supports 4 CPUs and 64 interrupt sources.
bootpath: /pci@f4000000/ata-6@d/disk@0:0/netbsd
mainbus0 (root)
cpu0 at mainbus0: 7447A (Revision 1.5), ID 0 (primary)
cpu0: HID0 0x84d0c1bc<EMCP,TBEN,HIGH_BAT_EN,NAP,DPM,ICE,DCE,XBSEN,SGE,BTIC,LRSTK,FOLD,BHT>, powersave: 1
cpu0: 1500.00 MHz, 512KB L2 cache no parity
memory0 at mainbus0: len=128
spdmem0 at memory0
spdmem0: DDR SDRAM, no parity or ECC, 1GB, 400MHz (PC-3200)
spdmem0: 13 rows, 11 cols, 2 ranks, 4 banks/chip, 5.0ns cycle time
spdmem0: tAA-tRCD-tRP-tRAS: 2-3-3-8
spdmem0: voltage SSTL 2.5V, refresh time 7.8us (self-refreshing)

	This one used to run NetBSD 7.1, where it detected 1GB memory,
	and my other NetBSD 8.0-running mac minis also detect 1GB
	memory:

NetBSD 8.0 (GOLDEN-DELICIOUS) #5: Tue Feb 26 11:52:02 CET 2019
        he%golden-delicious.urc.uninett.no@localhost:/usr/obj/sys/arch/macppc/compile/GOLDEN-DELICIOUS
total memory = 1024 MB
oea_startup: failed to allocate DEAD ZONE: error=12
avail memory = 981 MB
timecounter: Timecounters tick every 10.000 msec
Kernelized RAIDframe activated
found openpic PIC at 80040000
OpenPIC Version 1.2: Supports 4 CPUs and 64 interrupt sources.
bootpath: /pci@f4000000/ata-6@d/disk@0:0/netbsd
mainbus0 (root)
cpu0 at mainbus0: 7447A (Revision 1.2), ID 0 (primary)
cpu0: HID0 0x84d0c1bc<EMCP,EICE,DOZE,NAP,DPM,ICE,DCE,IFEM,SGE,BTIC,FBIOB,ABE,BHT>, powersave: 1
cpu0: 1500.00 MHz, 512KB L2 cache no parity parity enabled
memory0 at mainbus0: len=128
spdmem0 at memory0
spdmem0: DDR SDRAM, no parity or ECC, 1GB, 333MHz (PC-2700)
spdmem0: 13 rows, 11 cols, 2 ranks, 4 banks/chip, 6.0ns cycle time
spdmem0: tAA-tRCD-tRP-tRAS: 1-3-3-7
spdmem0: voltage SSTL 2.5V, refresh time 7.8us (self-refreshing)


NetBSD 8.0 (AMBROSIA) #4: Tue Apr 10 09:30:29 CEST 2018
        he%ambrosia.urc.uninett.no@localhost:/usr/obj/sys/arch/macppc/compile/AMBROSIA
total memory = 1024 MB
oea_startup: failed to allocate DEAD ZONE: error=12
avail memory = 981 MB
timecounter: Timecounters tick every 10.000 msec
Kernelized RAIDframe activated
found openpic PIC at 80040000
OpenPIC Version 1.2: Supports 4 CPUs and 64 interrupt sources.
bootpath: /pci@f4000000/ata-6@d/disk@0:0/netbsd
mainbus0 (root)
cpu0 at mainbus0: 7447A (Revision 1.2), ID 0 (primary)
cpu0: HID0 0x84d0c1bc<EMCP,EICE,DOZE,NAP,DPM,ICE,DCE,IFEM,SGE,BTIC,FBIOB,ABE,BHT
>, powersave: 1
cpu0: 1250.00 MHz, 512KB L2 cache no parity parity enabled
memory0 at mainbus0: len=128
spdmem0 at memory0
spdmem0: DDR SDRAM, no parity or ECC, 1GB, 333MHz (PC-2700)
spdmem0: 13 rows, 11 cols, 2 ranks, 4 banks/chip, 6.0ns cycle time
spdmem0: tAA-tRCD-tRP-tRAS: 1-3-3-7
spdmem0: voltage SSTL 2.5V, refresh time 7.8us (self-refreshing)


>How-To-Repeat:
	Upgrade a 1GB-equipped Mac Mini powerpc to 9.0_BETA.
>Fix:
	Sorry, have not looked into that.