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Message-ID: <9b1675090906102148m5634e652y34c101e28e4aab83@mail.gmail.com> Date: Wed, 10 Jun 2009 22:48:00 -0600 From: "Trenton D. Adams" <trenton.d.adams@...il.com> To: Robert Hancock <hancockrwd@...il.com> Cc: Yinghai Lu <yhlu.kernel@...il.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: Macbook 4G only see 3G On Wed, Jun 10, 2009 at 10:23 PM, Robert Hancock<hancockrwd@...il.com> wrote: > Trenton D. Adams wrote: >> dmtdamac ~ # dmesg >> Linux version 2.6.30-rc7-dirty (root@...mac) (gcc version 4.3.2 >> (Gentoo 4.3.2-r3 p1.6, pie-10.1.5) ) #3 SMP Fri Jun 5 21:24:29 MDT >> 2009 >> Command line: root=/dev/ram0 init=/linuxrc real_root=/dev/s/sys dolvm >> hung_task_show_state=1 >> KERNEL supported cpus: >> Intel GenuineIntel >> AMD AuthenticAMD >> Centaur CentaurHauls >> BIOS-provided physical RAM map: >> BIOS-e820: 0000000000000000 - 000000000009fc00 (usable) >> BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved) >> BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) >> BIOS-e820: 0000000000100000 - 00000000be08c000 (usable) >> BIOS-e820: 00000000be08c000 - 00000000be28d000 (ACPI NVS) >> BIOS-e820: 00000000be28d000 - 00000000beebe000 (ACPI data) >> BIOS-e820: 00000000beebe000 - 00000000beeef000 (ACPI NVS) >> BIOS-e820: 00000000beeef000 - 00000000bef00000 (ACPI data) >> BIOS-e820: 00000000bef00000 - 00000000c0000000 (reserved) >> BIOS-e820: 00000000f0000000 - 00000000f4000000 (reserved) >> BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved) >> BIOS-e820: 00000000fed14000 - 00000000fed1a000 (reserved) >> BIOS-e820: 00000000fed1c000 - 00000000fed20000 (reserved) >> BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) >> BIOS-e820: 00000000ffe00000 - 0000000100000000 (reserved) > > The e820 map is the way that the BIOS tells us what memory is available. > Here it's only showing about 3040MB of usable memory, all below 4GB. The > usual way that it should work with 4GB of RAM is that the portion of the > memory corresponding to the address space occupied for PCI devices, etc. > gets relocated above 4GB. However either the chipset in your machine > doesn't support memory hole remapping, the BIOS doesn't bother to use it or > it doesn't bother to tell Linux where it is.. > > Do you know if Mac OS X is actually use all 4GB, or is it doing the "well, > we can see there's actually 4GB installed but we won't mention that we can't > use it all" trick, like some Windows does? > That is very well possible. It did appear to have over 3G free, if I recall correctly. I'll try booting into Mac OS X again and see. > Your dmesg shows your chiset is 945GM. > == > intelfb 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 > intelfb: 00:02.0: Intel(R) 945GM, aperture size 256MB, stolen memory 16124kB > intelfb: Non-CRT device is enabled ( LVDS port ). Disabling mode switching. > intelfb: Video mode must be programmed at boot time. > == > As far as I can found in English/Japanese forum, 945GM/PM? series can't handle > 4G memory. (Then, 64bit Vista can't handle it, either) That's my graphics card though, not my motherboard chipset. The chipset is ICH7. tdamac ~ # lspci 00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03) 00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03) 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03) 00:07.0 Performance counters: Intel Corporation Device 27a3 (rev 03) 00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02) 00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 02) 00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 02) 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 02) 00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 02) 00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 02) 00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 02) 00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2) 00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02) 00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02) 00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA IDE Controller (rev 02) 00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 02) 01:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8053 PCI-E Gigabit Ethernet Controller (rev 22) 02:00.0 Network controller: Atheros Communications Inc. AR5418 802.11abgn Wireless PCI Express Adapter (rev 01) 03:03.0 FireWire (IEEE 1394): Agere Systems FW323 (rev 61) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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