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dmidecode

ACIDANTHERA NOTES

This dmidecode version supports Apple-specific table decoding as well as native macOS SMBIOS reading through I/O Registry. Synced with upstream up to 51b1ecc2.

INTRODUCTION

Dmidecode reports information about your system's hardware as described in your system BIOS according to the SMBIOS/DMI standard. This information typically includes system manufacturer, model name, serial number, BIOS version, asset tag as well as a lot of other details of varying level of interest and reliability depending on the manufacturer. This will often include usage status for the CPU sockets, expansion slots (e.g. AGP, PCI, ISA) and memory module slots, and the list of I/O ports (e.g. serial, parallel, USB).

DMI data can be used to enable or disable specific portions of kernel code depending on the specific hardware. Thus, one use of dmidecode is for kernel developers to detect system "signatures" and add them to the kernel source code when needed.

Beware that DMI data have proven to be too unreliable to be blindly trusted. Dmidecode does not scan your hardware, it only reports what the BIOS told it to.

INSTALLATION

The home web page for dmidecode is hosted on Savannah: http://www.nongnu.org/dmidecode/ You will find the latest version (including CVS) there, as well as fresh news and other interesting material, such as a list of related projects and articles.

This program was first written for Linux, and has since been reported to work on FreeBSD, NetBSD, OpenBSD, BeOS and Solaris as well.

There's no configure script, so simply run "make" to build dmidecode, and "make install" to install it. You also can use "make uninstall" to remove all the files you installed. By default, files are installed in /usr/local but you can change this behavior by editing the Makefile file and setting prefix to wherever you want. You may change the C compiler and the compilation flags as well.

Optionally, you can run "make strip" prior to "make install" if you want smaller binaries. However, be aware that this will prevent any further attempt to debug the programs.

Two parameters can be set in the Makefile file to make dmidecode work on non-i386 systems. They should be used if your system uses the big endian byte ordering (Motorola) or doesn't support unaligned memory accesses, respectively. For example, compiling for a SPARC processor would require both (but I am not aware of SPARC-based systems implementing SMBIOS). Compiling for an IA64 processor requires the memory alignment workaround, and it is enabled automatically.

DOCUMENTATION

Each tool has a manual page, found in the "man" subdirectory. Manual pages are installed by "make install". See these manual pages for command line interface details and tool specific information.

For an history of the changes made to dmidecode, see the NEWS file.

If you need help, your best chances are to visit the web page (see the INSTALLATION section above) or to get in touch with the developers directly. Have a look at the AUTHORS file and contact one of the maintainers.

If you want to help with the development of dmidecode, please consider joining the dmidecode-devel discussion list: http://lists.nongnu.org/mailman/listinfo/dmidecode-devel

COMMON PROBLEMS

IA-64

Non-Linux systems are not yet supported.

MMAP

Note that mmap() is now used by default wherever possible, since this seems to solve a number of problems. This default behavior can be changed in config.h. Just to make sure this is clear, mmap() is not used for performance reasons but to increase the number of systems on which dmidecode can be successfully run.

CYGWIN

Dmidecode used to work under Cygwin. However the /dev/mem interface was removed at some point in time so it no longer works.

MISCELLANEOUS TOOLS

Three other tools come along with dmidecode: biosdecode, ownership and vpddecode. These tools are only useful on systems with a BIOS, so they are not built on IA-64 by default.

BIOSDECODE

This one prints all BIOS related information it can find in /dev/mem. It used to be part of dmidecode itself, but as dmidecode was growing, we felt that the non-DMI part had to be moved to a separate tool.

OWNERSHIP

This tool was written on a request by Luc Van de Velde for use with Novell tools in his company. It retrieves the "ownership tag" that can be set on most Compaq computers. Since it uses the same mechanisms dmidecode and biosdecode use, and could be of some use for other people as well, we decided to make it part of the project.

VPDDECODE

This tool prints the contents of the "vital product data" structure as found in most IBM and Lenovo computers. It used to have a lookup table for the machine name, but it was unreliable and hard to maintain so it was ultimately dropped. It has a command line interface.

Use -h flag for help.