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2.1 amd64

Since mid-2003 FreeBSD/amd64 has supported the AMD64 Hammer and Intel EM64T architecture, and is now one of the Tier-1 platforms fully supported architecture, which are expected to be Production Quality with respects to all aspects of the FreeBSD operating system, including installation and development environments.

Note that there are two names for this architecture, AMD64 AMD and Intel EM64T Extended Memory 64-bit Technology. 64-bit mode of the two architectures are almost compatible with each other, and FreeBSD/amd64 should support them both.

As of this writing, the following processors are supported:

AMD Athlon 64 Clawhammer.

All multi-core Intel Xeon processors except Sossaman have EM64T support.

The single-core Intel Xeon processors Nocona, Irwindale, Potomac, and Cranford have EM64T support.

All Intel Core 2 not Core Duo and later processors

All Intel Pentium D processors

Intel Pentium 4s and Celeron Ds using the Cedar Mill core have EM64T support.

Some Intel Pentium 4s and Celeron Ds using the Prescott core have EM64T support. See the Intel Processor Spec Finder for the definitive answer about EM64T support in Intel processors.

Intel EM64T is an extended version of IA-32 x86 and different from Intel IA-64 Itanium architecture, which FreeBSD/ia64 supports. Some Intel s old documentation refers to Intel EM64T as 64-bit extension technology or IA-32e.

The largest tested memory configuration to date is 32GB. SMP support has been recently completed and is reasonably robust.

In many respects, FreeBSD/amd64 is similar to FreeBSD/i386, in terms of drivers supported. There may be some issues with 64-bit cleanliness in some particularly older drivers. Generally, drivers that already function correctly on other 64-bit platforms should work.

FreeBSD/amd64 is a very young platform on FreeBSD. While the core FreeBSD kernel and base system components are generally fairly robust, there are likely to still be rough edges, particularly with third party packages.

2.2 i386

FreeBSD/i386 runs on a wide variety of IBM PC compatible machines. Due to the wide range of hardware available for this architecture, it is impossible to exhaustively list all combinations of equipment supported by FreeBSD. Nevertheless, some general guidelines are presented here.

Almost all i386 -compatible processors with a floating point unit are supported. All Intel processors beginning with the 80486 are supported, including the 80486, Pentium, Pentium Pro, Pentium II, Pentium III, Pentium 4, and variants thereof, such as the Xeon and Celeron processors. All i386-compatible AMD processors are also supported, including the Am486, Am5x86, K5, AMD-K6 and variants, AMD Athlon including Athlon-MP, Athlon-XP, Athlon-4, and Athlon Thunderbird, and AMD Duron processors. The AMD Élan SC520 embedded processor is supported. The Transmeta Crusoe is recognized and supported, as are i386-compatible processors from Cyrix and NexGen.

There is a wide variety of motherboards available for this architecture. Motherboards using the ISA, VLB, EISA, AGP, and PCI expansion busses are well-supported. There is some limited support for the MCA MicroChannel expansion bus used in the IBM PS/2 line of PCs.

Symmetric multi-processor SMP systems are generally supported by FreeBSD, although in some cases, BIOS or motherboard bugs may generate some problems. Perusal of the archives of the FreeBSD symmetric multiprocessing mailing list may yield some clues.

FreeBSD will take advantage of HyperThreading HTT support on Intel CPUs that support this feature. A kernel with the options SMP feature enabled will automatically detect the additional logical processors. The default FreeBSD scheduler treats the logical processors the same as additional physical processors; in other words, no attempt is made to optimize scheduling decisions given the shared resources between logical processors within the same CPU. Because this naive scheduling can result in suboptimal performance, under certain circumstances it may be useful to disable the logical processors with the the machdep.hlt_logical_cpus sysctl variable. It is also possible to halt any CPU in the idle loop with the machdep.hlt_cpus sysctl variable. The smp 4 manual page has more details.

FreeBSD will take advantage of Physical Address Extensions PAE support on CPUs that support this feature. A kernel with the PAE feature enabled will detect memory above 4 gigabytes and allow it to be used by the system. This feature places constraints on the device drivers and other features of FreeBSD which may be used; consult the pae 4 manpage for more details.

FreeBSD will generally run on i386-based laptops, albeit with varying levels of support for certain hardware features such as sound, graphics, power management, and PCCARD expansion slots. These features tend to vary in idiosyncratic ways between machines, and frequently require special-case support in FreeBSD to work around hardware bugs or other oddities. When in doubt, a search of the archives of the FreeBSD laptop computer mailing list may be useful.

Most modern laptops as well as many desktops use the Advanced Configuration and Power Management ACPI standard. FreeBSD supports ACPI via the ACPI Component Architecture reference implementation from Intel, as described in the acpi 4 manual page. The use of ACPI causes instabilities on some machines and it may be necessary to disable the ACPI driver, which is normally loaded via a kernel module. This may be accomplished by adding the following line to /boot/device.hints:

hint.acpi.0.disabled 1

Users debugging ACPI-related problems may find it useful to disable portions of the ACPI functionality. The acpi 4 manual page has more information on how to do this via loader tunables.

ACPI depends on a Differentiated System Descriptor Table DSDT provided by each machine s BIOS. Some machines have bad or incomplete DSDTs, which prevents ACPI from functioning correctly. Replacement DSDTs for some machines can be found at the DSDT section of the ACPI4Linux project Web site. FreeBSD can use these DSDTs to override the DSDT provided by the BIOS; see the acpi 4 manual page for more information.

Currently supported processors are the Itanium and the Itanium 2.

Supported chipsets include.

Template:10.5.2. This is a component level hardware compatibility list. We want to keep it as accurate as possible, but please, do not entirely rely on this list when.

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1 Introduction. This document contains the hardware compatibility notes for FreeBSD 7.2-RELEASE. It lists the hardware platforms supported by FreeBSD, as well as the.

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