You have a 32bit uefi on the MacBook2,1
Its set to only ever address 3GB of ram, even though you can physically have more in the box.
(this is a 32 bit issue in general - x86 hardware usually defaults to a 3.5GB/512MB split, but the 32bit uefi/64bit cpu macs went with a 3GB/1GB split)
> On May 30, 2020, at 10:23 AM, Jan Stary <hans@stare.cz> wrote:
>
> This is current/amd64 on a macbook2,1 (dmesg below).
> It has two RAM slots, each holding a 2GB module:
>
> spdmem0 at iic0 addr 0x50: 2GB DDR2 SDRAM non-parity PC2-6400CL6 SO-DIMM
> spdmem1 at iic0 addr 0x52: 2GB DDR2 SDRAM non-parity PC2-6400CL6 SO-DIMM
>
> But of one of the 2GB, only 1GB is seen:
>
> real mem = 3171909632 (3024MB)
>
> I have tried swapping the mdules, it only happens
> in one of the two slots. If I put a 1GB module in there,
> the available memory is the same (in the other slot,
> 2GB is 2GB and 1GB is 1GB).
>
> Why is this? Does it have anthing to do with
> the memory map conflicts I see in the dmesg?
>
> Jan
>
>
> OpenBSD 6.7-current (GENERIC.MP) #0: Sat May 30 17:45:54 CEST 2020
> hans@mb64.stare.cz:/usr/src/sys/arch/amd64/compile/GENERIC.MP
> real mem = 3171909632 (3024MB)
> avail mem = 3063046144 (2921MB)
> random: good seed from bootblocks
> mpath0 at root
> scsibus0 at mpath0: 256 targets
> mainbus0 at root
> bios0 at mainbus0: SMBIOS rev. 2.4 @ 0xe0000 (37 entries)
> bios0: vendor Apple Inc. version "MB21.88Z.00A5.B07.0706270922" date 06/27/07
> bios0: Apple Inc. MacBook2,1
> acpi0 at bios0: ACPI 3.0
> acpi0: sleep states S0 S3 S4 S5
> acpi0: tables DSDT FACP HPET APIC MCFG ASF! SBST ECDT SSDT SSDT SSDT
> acpi0: wakeup devices ADP1(S3) LID0(S3) PXS1(S4) PXS2(S4) USB1(S3) USB2(S3) USB3(S3) USB4(S3) USB7(S3) EC__(S3)
> acpitimer0 at acpi0: 3579545 Hz, 24 bits
> acpihpet0 at acpi0: 14318179 Hz
> acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
> cpu0 at mainbus0: apid 0 (boot processor)
> cpu0: Intel(R) Core(TM)2 CPU T7400 @ 2.16GHz, 2161.59 MHz, 06-0f-06
> cpu0: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,NXE,LONG,LAHF,PERF,SENSOR,MELTDOWN
> cpu0: 4MB 64b/line 16-way L2 cache
> cpu0: smt 0, core 0, package 0
> mtrr: Pentium Pro MTRR support, 8 var ranges, 88 fixed ranges
> cpu0: apic clock running at 166MHz
> cpu0: mwait min=64, max=64, C-substates=0.2.2.2.2, IBE
> cpu1 at mainbus0: apid 1 (application processor)
> cpu1: Intel(R) Core(TM)2 CPU T7400 @ 2.16GHz, 2161.28 MHz, 06-0f-06
> cpu1: FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,SSE3,DTES64,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,NXE,LONG,LAHF,PERF,SENSOR,MELTDOWN
> cpu1: 4MB 64b/line 16-way L2 cache
> cpu1: smt 0, core 1, package 0
> ioapic0 at mainbus0: apid 1 pa 0xfec00000, version 20, 24 pins, remapped
> acpimcfg0 at acpi0
> acpimcfg0: addr 0xf0000000, bus 0-255
> acpiec0 at acpi0
> acpiprt0 at acpi0: bus 0 (PCI0)
> acpiprt1 at acpi0: bus 1 (RP01)
> acpiprt2 at acpi0: bus 2 (RP02)
> acpiprt3 at acpi0: bus 3 (PCIB)
> acpicpu0 at acpi0: !C3(100@55 mwait@0x31), !C2(500@1 mwait@0x10), C1(1000@1 mwait), PSS
> acpicpu1 at acpi0: !C3(100@55 mwait@0x31), !C2(500@1 mwait@0x10), C1(1000@1 mwait), PSS
> acpisbs0 at acpi0: SBS0 model "ASMB016" serial 19351 type LION oem "DP"
> acpiac0 at acpi0: AC unit online
> acpibtn0 at acpi0: LID0
> "APP0002" at acpi0 not configured
> acpibtn1 at acpi0: PWRB
> acpibtn2 at acpi0: SLPB
> acpipci0 at acpi0 PCI0: 0x00000010 0x00000011 0x00000000memory map conflict 0xbef00000/0x100000
> memory map conflict 0xbf000000/0x1000000
> memory map conflict 0xf00f8000/0x1000
> memory map conflict 0xfed1c000/0x4000
> memory map conflict 0xfffb0000/0x30000
>
> extent `acpipci0 pcibus' (0x0 - 0xff), flags=0
> extent `pciio' (0x0 - 0xffffffff), flags=0
> 0x10000 - 0xffffffff
> extent `pcimem' (0x0 - 0xffffffffffffffff), flags=0
> 0x0 - 0xbfffffff
> 0xf0000000 - 0xf3ffffff
> 0xfec00000 - 0xfec00fff
> 0xfed14000 - 0xfed19fff
> 0xfed1c000 - 0xfed1ffff
> 0xfee00000 - 0xfee00fff
> 0xffe00000 - 0xffffffff
> 0x40000000000 - 0xffffffffffffffff
> "APP0001" at acpi0 not configured
> "APP0003" at acpi0 not configured
> "ACPI0001" at acpi0 not configured
> acpicmos0 at acpi0
> acpivideo0 at acpi0: GFX0
> cpu0: Enhanced SpeedStep 2161 MHz: speeds: 2167, 2000, 1833, 1667, 1500, 1333, 1000 MHz
> pci0 at mainbus0 bus 0
> pchb0 at pci0 dev 0 function 0 "Intel 82945GM Host" rev 0x03
> inteldrm0 at pci0 dev 2 function 0 "Intel 82945GM Video" rev 0x03
> drm0 at inteldrm0
> intagp0 at inteldrm0
> agp0 at intagp0: aperture at 0xc0000000, size 0x10000000
> inteldrm0: apic 1 int 16, I945GM, gen 3
> "Intel 82945GM Video" rev 0x03 at pci0 dev 2 function 1 not configured
> vendor "Intel", unknown product 0x27a3 (class DASP subclass Time and Frequency, rev 0x03) at pci0 dev 7 function 0 not configured
> azalia0 at pci0 dev 27 function 0 "Intel 82801GB HD Audio" rev 0x02: msi
> azalia0: codecs: Sigmatel STAC9220/1
> audio0 at azalia0
> ppb0 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x02: msi
> pci1 at ppb0 bus 1
> mskc0 at pci1 dev 0 function 0 "Marvell Yukon 88E8053" rev 0x22, Yukon-2 EC rev. A3 (0x2): apic 1 int 16
> msk0 at mskc0 port A: address 00:1b:63:36:2b:5d
> eephy0 at msk0 phy 0: 88E1111 Gigabit PHY, rev. 2
> ppb1 at pci0 dev 28 function 1 "Intel 82801GB PCIE" rev 0x02: msi
> pci2 at ppb1 bus 2
> athn0 at pci2 dev 0 function 0 "Atheros AR5418" rev 0x01: apic 1 int 17
> athn0: MAC AR5418 rev 2, RF AR5133 (2T3R), ROM rev 4, address 00:1c:b3:c4:b2:ae
> uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x02: apic 1 int 21
> uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x02: apic 1 int 19
> uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x02: apic 1 int 18
> uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x02: apic 1 int 16
> ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x02: apic 1 int 21
> usb0 at ehci0: USB revision 2.0
> uhub0 at usb0 configuration 1 interface 0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
> ppb2 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0xe2
> pci3 at ppb2 bus 3
> "AT&T/Lucent FW322 1394" rev 0x61 at pci3 dev 3 function 0 not configured
> pcib0 at pci0 dev 31 function 0 "Intel 82801GBM LPC" rev 0x02
> pciide0 at pci0 dev 31 function 1 "Intel 82801GB IDE" rev 0x02: DMA, channel 0 configured to compatibility, channel 1 configured to compatibility
> atapiscsi0 at pciide0 channel 0 drive 0
> scsibus1 at atapiscsi0: 2 targets
> cd0 at scsibus1 targ 0 lun 0: <MATSHITA, DVD-R UJ-857E, ZB0E> removable
> cd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 4
> pciide0: channel 1 disabled (no drives)
> pciide1 at pci0 dev 31 function 2 "Intel 82801GBM SATA" rev 0x02: DMA, channel 0 configured to native-PCI, channel 1 configured to native-PCI
> pciide1: using apic 1 int 19 for native-PCI interrupt
> wd0 at pciide1 channel 0 drive 1: <ST980811AS>
> wd0: 16-sector PIO, LBA48, 76319MB, 156301488 sectors
> wd0(pciide1:0:1): using PIO mode 4, Ultra-DMA mode 6
> ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x02: apic 1 int 19
> iic0 at ichiic0
> iic0: addr 0x48 00=3c 01=00 02=4b 03=50 words 00=3c00 01=00ff 02=4b00 03=5000 04=ffff 05=ffff 06=ffff 07=ffff
> spdmem0 at iic0 addr 0x50: 2GB DDR2 SDRAM non-parity PC2-6400CL6 SO-DIMM
> spdmem1 at iic0 addr 0x52: 2GB DDR2 SDRAM non-parity PC2-6400CL6 SO-DIMM
> usb1 at uhci0: USB revision 1.0
> uhub1 at usb1 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1
> usb2 at uhci1: USB revision 1.0
> uhub2 at usb2 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1
> usb3 at uhci2: USB revision 1.0
> uhub3 at usb3 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1
> usb4 at uhci3: USB revision 1.0
> uhub4 at usb4 configuration 1 interface 0 "Intel UHCI root hub" rev 1.00/1.00 addr 1
> isa0 at pcib0
> isadma0 at isa0
> pcppi0 at isa0 port 0x61
> spkr0 at pcppi0
> asmc0 at isa0 port 0x300/32: rev 1.17f517, 226 keys
> vmm0 at mainbus0: VMX (using slow L1TF mitigation)
> uvideo0 at uhub0 port 4 configuration 1 interface 0 "Micron Built-in iSight" rev 2.00/1.84 addr 2
> uvideo0: can't find interface assoc descriptor
> ugen0 at uhub0 port 4 configuration 1 "Micron Built-in iSight" rev 2.00/1.84 addr 2
> uhidev0 at uhub1 port 2 configuration 1 interface 0 "Apple Computer Apple Internal Keyboard / Trackpad" rev 2.00/0.18 addr 2
> uhidev0: iclass 3/1
> ukbd0 at uhidev0: 8 variable keys, 5 key codes, country code 13
> wskbd0 at ukbd0: console keyboard
> uhidev1 at uhub1 port 2 configuration 1 interface 1 "Apple Computer Apple Internal Keyboard / Trackpad" rev 2.00/0.18 addr 2
> uhidev1: iclass 3/1, 5 report ids
> ums0 at uhidev1 reportid 2: 3 buttons
> wsmouse0 at ums0 mux 0
> ums1 at uhidev1 reportid 5
> ums1: mouse has no X report
> uhidev2 at uhub1 port 2 configuration 1 interface 2 "Apple Computer Apple Internal Keyboard / Trackpad" rev 2.00/0.18 addr 2
> uhidev2: iclass 3/0
> uhid0 at uhidev2: input=1, output=0, feature=0
> uhidev3 at uhub3 port 2 configuration 1 interface 0 "Apple Computer, Inc. IR Receiver" rev 2.00/1.10 addr 2
> uhidev3: iclass 3/0, 38 report ids
> uhid1 at uhidev3 reportid 36: input=4, output=0, feature=0
> uhid2 at uhidev3 reportid 37: input=4, output=0, feature=0
> uhid3 at uhidev3 reportid 38: input=4, output=0, feature=0
> uhidev4 at uhub4 port 1 configuration 1 interface 0 "Apple Computer HID-proxy" rev 2.00/19.65 addr 2
> uhidev4: iclass 3/1
> ukbd1 at uhidev4: 8 variable keys, 6 key codes
> wskbd1 at ukbd1 mux 1
> uhidev5 at uhub4 port 1 configuration 1 interface 1 "Apple Computer HID-proxy" rev 2.00/19.65 addr 2
> uhidev5: iclass 3/1
> ums2 at uhidev5: 5 buttons
> wsmouse1 at ums2 mux 0
> vscsi0 at root
> scsibus2 at vscsi0: 256 targets
> softraid0 at root
> scsibus3 at softraid0: 256 targets
> root on wd0a (31e6463adc99e6ba.a) swap on wd0b dump on wd0b
> inteldrm0: 1280x800, 32bpp
> wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation), using wskbd0
> wskbd1: connecting to wsdisplay0
> wsdisplay0: screen 1-5 added (std, vt100 emulation)
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