summaryrefslogtreecommitdiff
path: root/rules.d
Commit message (Collapse)AuthorAgeFilesLines
* udev: add flag to allow disabling blkid probingDarsey Litzenberger2022-07-151-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | This can be useful for users of slow block devices. For example, the persistent-storage rules are needed for USB floppy drives be recognized by udisks2, but the extra blkid calls cause thrashing for 25+ seconds after every disk change. With this change, a user wishing to avoid the extra blkid invocation(s) could create /etc/udev/rules.d/55-floppy-noprobe.rules as follows: # Don't probe PC floppy drives SUBSYSTEM=="block", KERNEL=="fd*", \ ENV{UDEV_DISABLE_PERSISTENT_STORAGE_BLKID_FLAG}="1" # Don't probe USB floppy drives SUBSYSTEM=="block", SUBSYSTEMS=="usb", \ ATTRS{bInterfaceClass}=="08", ATTRS{bInterfaceSubClass}=="04", \ ENV{UDEV_DISABLE_PERSISTENT_STORAGE_BLKID_FLAG}="1" I didn't exclude floppies by default in this change, because floppy devices are also emulated by some BIOSes/hypervisors in some cases, and I don't know how many systems would fail to boot if /dev/disk/by-uuid/* became unavailable for 'floppy disks' on those systems.
* meson: install 70-power-switch.rulesYu Watanabe2022-05-191-0/+3
| | | | | | Fixes a bug introduced by 155078c835a00fed264a7b36b06f709d9b57cb1b. Fixes #23425.
* Add support to set autosuspend delay via hwdbMario Limonciello2022-05-091-0/+4
|
* meson: move vconsole rules to rules.d/Zbigniew Jędrzejewski-Szmek2022-05-052-0/+14
|
* meson: move udev rules to rules.d/Zbigniew Jędrzejewski-Szmek2022-05-055-48/+280
|
* udev: set ID_IGNORE_DISKSEQ for md devicesYu Watanabe2022-04-141-0/+4
|
* udev: do not create disk/by-diskseq symlink when ID_IGNORE_DISKSEQ property ↵Yu Watanabe2022-04-141-1/+1
| | | | is set
* udev: create disk/by-diskseq symlink only when the device has diskseqYu Watanabe2022-04-131-1/+1
| | | | Follow-up for 0d08db7f89ee665a9dcb6dd66c1f9e203192e8ec.
* meson: also allow setting GIT_VERSION via templatesZbigniew Jędrzejewski-Szmek2022-04-051-1/+1
| | | | | | | | | GIT_VERSION is not available as a config.h variable, because it's rendered into version.h during builds. Let's rework jinja2 rendering to also parse version.h. No functional change, the new variable is so far unused. I guess this will make partial rebuilds a bit slower, but it's useful to be able to use the full version string.
* udev: add /dev/disk/by-diskseq symlink for block devicesLennart Poettering2022-04-011-0/+5
| | | | | | | | | | | | | | | | | This adds another symlink for block devices: /dev/disk/by-diskseq/<number> where the number is the diskseq number as exposed by the kernel. It's useful for apps because they can use it to open a device by diskseq, in a way that is safe against device node reuse. I.e. if a device node path like this is passed to an app it could open the device node via the symlink and also parse the diskseq from the path. Once the device is opened it could compare the parsed diskseq with the one returned by BLKGETDISKSEQ on the open node, and if it matches they know they are talking to the right device. Fixes: #22906
* udev: 60-persistent-storage-tape.rules: handle duplicate device IDDavid Bond2022-03-081-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | Some SCSI tape devices use the same device ID (NAA registered device designator) for the SCSI tape changer device and the first actual tape device. For example, this one: https://docs.oracle.com/en/storage/tape-storage/storagetek-sl150-modular-tape-library/slofs/bridged-tape-drives.html You must connect the bridged drive to an HBA supporting multiple LUNs (also referred to as LUN scanning). The SL150 Library uses a single SCSI ID and two logical unit numbers (LUN). LUN 0 controls the tape drive and LUN 1 which is configured as a SCSI medium changer device controls the robotics. Data is sent to the remaining LUN on the bridged drive or to LUNs on the other, unbridged drives in the partition, all of which are configured as SCSI sequential-access (tape) devices. This may lead to errors because /dev/tape/by-id symlinks may sometimes point to the st device representing the tape, and sometimes to the sg device representing the changer. Fix this by assigning an increased priority to the tape device, and creating a separate -changer link for the SCSI tape changer. Co-developed-by: Martin Wilck <mwilck@suse.com>
* meson: do not use split() in file listsZbigniew Jędrzejewski-Szmek2022-03-021-25/+24
| | | | | | | | | | | The approach to use '''…'''.split() instead of a list of strings was initially used when converting from automake because it allowed identical blocks of lines to be used for both, making the conversion easier. But over the years we have been using normal lists more and more, especially when there were just a few filenames listed. This converts the rest. No functional change.
* rule: fallback to use board information if product information is not setYu Watanabe2022-01-231-0/+3
|
* rule: make ID_SYSFS_ATTRIBUTE_MODEL also accept product_nameYu Watanabe2022-01-231-2/+5
|
* Revert "udev: Import hwdb matches for USB devices"Zbigniew Jędrzejewski-Szmek2022-01-041-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | This reverts commit 94cb45d57f6e94dd4c93bd4706f9be70634bf03f. This rule set up a duplicate import: $ udevadm test /devices/pci0000:00/0000:00:14.0/usb2/2-4/2-4.1/2-4.1.3 ... 2-4.1.3: /usr/lib/udev/rules.d/40-libgphoto2.rules:9 Importing properties from results of builtin command 'usb_id' 2-4.1.3: /usr/lib/udev/rules.d/50-udev-default.rules:13 Skipping builtin 'usb_id' in IMPORT key 2-4.1.3: /usr/lib/udev/rules.d/50-udev-default.rules:13 Importing properties from results of builtin command 'hwdb --subsystem=usb' 2-4.1.3: hwdb modalias key: "usb:v17EFp3054:OneLink+ Giga" 2-4.1.3: /usr/lib/udev/rules.d/50-udev-default.rules:15 Importing properties from results of builtin command 'hwdb 'usb:v17efp3054'' 2-4.1.3: No entry found from hwdb. 2-4.1.3: /usr/lib/udev/rules.d/50-udev-default.rules:15 Failed to run builtin 'hwdb 'usb:v17efp3054'': No data available 2-4.1.3: /usr/lib/udev/rules.d/50-udev-default.rules:52 MODE 0664 except that the existing one was done with uppercase digits and the full match pattern, and the second one was done with lowercase digits. With the previous commit we only have uppercase digits in our match patterns, so we can drop the duplicate import. (Some other projects might have rules that used the lowercase match patterns, and people might have some local rules that did that too. But the second import was only added recently so I think it's better to rip off the bandaid quickly.)
* Enable /dev/sgx_vepc access for the group 'sgx'Jarkko Sakkinen2021-12-121-0/+1
| | | | | | | Enable /dev/sgx_vepc access for the group 'sgx', which allows KVM-backed VMs to host Intel Software Guard eXtension (SGX) enclaves. The upcoming QEMU 6.2 uses /dev/sgx_vepc to reserve portions of Enclave Page Cache (EPC) for VMs. EPC is the reserved physical memory used for hosting enclaves.
* build: preserve correct mode when generating files via jinja2Christian Brauner2021-11-081-2/+1
| | | | | | | | | When using "capture : true" in custom_target()s the mode of the source file is not preserved when the generated file is not installed and so needs to be tweaked manually. Switch from output capture to creating the target file and copy the permissions from the input file. Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
* hwdb: Tag IR cameras as suchwip/hadess/webcamsBastien Nocera2021-10-272-0/+10
| | | | | | So that front-ends can ignore them if they wish to. See https://gitlab.gnome.org/GNOME/cheese/-/merge_requests/4
* docs: Fixing typo in systemd.device man page and README.alexlzhu2021-09-291-1/+1
| | | | | | | | | systemd-udevd.service listens to kernel uevents and is needed for device units to be available. systemd-udevd.service is misspelled as systemd-udev.service in a couple places. Fixing typo.
* hwdb: Permit unsetting power/persist for USB devicesBenjamin Berg2021-09-211-0/+4
| | | | | | | | | | | | | | | | The USB persist feature allows devices that can retain their state when powered down to work across suspend/resume. This is in particular useful for USB drives. However, the persist feature can get in the way for devices that are unable to retain their state when power is lost. An example of such stateful devices are fingerprint readers where USB persist should be disabled to ensure userspace can detect whether the USB device had a power loss during system suspend. This will initially be used by the libfprint autosuspend hwdb. Closes: #20754
* udev: Import hwdb matches for USB devicesBastien Nocera2021-09-011-0/+1
| | | | | | Import hwdb matches for USB devices (not interfaces) which don't usually have a modalias so that it's possible to, for example, make them available for unprivileged users.
* udev: Fix by-uuid symlink for ubifs volumesTrent Piepho2021-07-021-1/+1
| | | | | | | | | | | | | ubifs volumes have a UUID and the built-in blkid is able to determine it. The disk/by-uuid symlink isn't created because ubifs volumes are not on block devices but on SUBSYSTEM="ubi" devices. See #20071. Allow ubi subsystem devices to be processed by the persistent storage rules too. The kernel device name matching already allows ubi* to pass. The existing rules are sufficient to create the link. The links look like other by-uuid symlinks, for example: /dev/disk/by-uuid/9a136158-585b-4ba4-9b70-cbaf2cf78a1c -> ../../ubi0_1
* Revert "rules: ubi mtd - add link to named partitions"Lennart Poettering2021-07-011-3/+0
| | | | | | | | This reverts commit 7f1e9c806b6915e8020cf3706dc87e1cd37bc2fa, PR #6750 Apparently the rule change never worked, see #20071. Fixes #20071
* udev: remove unsafe characters from ID_SERIAL for nvmeYu Watanabe2021-06-231-2/+2
| | | | Fixes #19309.
* rules.d: Properly quote $env{MODALIAS}Roshan Shariff2021-05-241-1/+1
| | | | | | Add quotes around use of $env{MODALIAS} in rules.d/80-drivers.rules. The modalias can contain whitespace, for example when it is dynamically generated using device or vendor IDs.
* meson: use jinja2 for rules.d templatesZbigniew Jędrzejewski-Szmek2021-05-194-18/+17
|
* Merge pull request #19513 from takaswie/topic/ieee1394-hwdb-entries-for-videoYu Watanabe2021-05-061-5/+0
|\ | | | | hwdb: ieee1394-unit-function: add entries to obsolete existent udev rules for video function
| * hwdb: ieee1394-unit-function: add entry for AV/C device with vendor unique ↵Takashi Sakamoto2021-05-051-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | command set In IEC 61883-1:1998, we can see some values for AV/C device with vendor unique command set in IEC 61883-1:1998. Current udev rule handles it for video. However it brings an issue that the functions in AV/C device are not distinguished just by the content of configuration ROM. In former commit, hardware database was added to describe function type of unit in the node, then udev rules are added to utilize the database. However, we have an request to obsolete existent udev rules by putting enough entries to the database. It should be done carefully. This commit adds entry into hardware database just for backward compatibility. The entry can match to some node and unit unexpectedly. Therefore this commit modifies existent entries to invalidate the effect from added entry. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
| * hwdb: ieee1394-unit-function: add entry for AV/C device with generic AV/C ↵Takashi Sakamoto2021-05-051-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | command set Typical node of AV/C device has standard content of configuration ROM. This is defined in documentation of 1394 Trading Association. * Configuration ROM for AV/C Devices 1.0 (Dec. 12, 2000, 1394 Trading Association, TA Document 1999027) However, it brings an issue that the functions in AV/C device are not distinguished just by the content of configuration ROM. In former commit, hardware database was added to describe function type of unit in the node, then udev rules are added to utilize the database. However, we have an request to obsolete existent udev rules by putting enough entries to the database. It should be done carefully. This commit adds entry into hardware database just for backward compatibility. The entry can match to some node and unit unexpectedly. Therefore this commit modifies existent entries to invalidate the effect from added entry. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
| * hwdb: ieee1394-unit-function: add entries for Point Grey camerasTakashi Sakamoto2021-05-051-1/+0
| | | | | | | | | | | | | | | | | | | | | | Point Grey Research, inc. shipped cameras to support IIDC, however some of them are necessarily compliant to IIDC specification in terms of the value of software version field in unit directory of configuration ROM. This commit adds entries for them. Reviewed-by: Damien Douxchamps <damien@douxchamps.net> Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
| * hwdb: ieee1394-unit-function: add IIDC generic entriesTakashi Sakamoto2021-05-051-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Instrumentation & Industrial Digital Camera (IIDC) specifications are defined by 1394 Trading Association for camera device in IEEE 1394 bus. IIDC2 specifications are defined by joint working group between Japan Industrial Imaging Association (JIIA) and 1394 Trade Association as bus-independent specification. This commit adds entries for the specifications to remove existent udev rules. Supported specifications are listed below: * 1394-based Digital Camera Specification Version 1.04 (Aug. 9, 1996, 1394 Trading Association) * 1394-based Digital Camera Specification Version 1.20 (Jul. 23, 1998, 1394 Trading Association) * IIDC Digital Camera Control Specification Ver.1.30 (Jul. 25, 2000, 1394 Trading Association) * IIDC Digital Camera Control Specification Ver.1.31 (Feb. 2, 2004, 1394 Trading Association, TA Document 2003017) * IIDC Digital Camera Control Specification Ver.1.32 (Jul. 24, 2008, 1394 Trading Association, Document number 2007009) * IIDC2 Digital Camera Control Specification Ver.1.0.0 (Jan 26th, 2012, 1394 Trading Association, TS2011001) * IIDC2 Digital Camera Control Specification Ver.1.1.0 (May 19th, 2015, 1394 Trading Association, TS2015001) Reviewed-by: Damien Douxchamps <damien@douxchamps.net> Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
* | udev: make /dev/vfio/vfio 0666Alyssa Ross2021-05-051-0/+2
|/ | | | | | | Quoting Documentation/driver-api/vfio.rst in Linux: > note that /dev/vfio/vfio provides no capabilities on its own and is therefore > expected to be set to mode 0666 by the system
* Merge pull request #19124 from takaswie/topic/fw-audio-entriesLennart Poettering2021-04-231-0/+10
|\ | | | | hwdb/rule: add database and rules for known audio and music unit in IEEE 1394 bus
| * hwdb: add hardware database for unit of IEEE 1394Takashi Sakamoto2021-04-071-0/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Current udev rules configures group owner of firewire character device to video group, corresponding to nodes in IEEE 1394 in below cases: 1.the node with any unit for any minor version of IIDC version 1 specification defined by 1394 Trading Association 2.the node with any unit for specification defined by Point Grey Research 3.the node with any unit for AV/C device v1.0 defined by 1394 Trading Association 4.the node with any unit for vendor-unique protocol defined by 1394 Trading Association Nevertheless, case 3 and 4 can cover the node with any unit for audio function as well. In the cases, it's convenient to assign audio group. Additionally, some nodes are known to have layout different from the specification defined by 1394 Trading Association. In the case, it's required to add rules specific to them. Furthermore, some nodes have no fields for vendor name and model name in configuration ROM. In the case, it's required to add entries to hardware database for users convenience. For the above reasons, this commit adds rules to use information in hardware database for known units in IEEE 1394. One database entry corresponds to one unit. Two types of key are used to match the unit; customized key from node context, kernel modalias of unit context. The entry has the type of function, at least. Supplementally, it has vendor and model names. For your information, below statements with Python pyparsing module are expected to parse all of the custom key and module alias in the list: ``` subsystem_prefix = pp.Literal('ieee1394:').suppress() hex_to_int = lambda a: int(a[0], 16) node_prefix = pp.Literal('node:').suppress() prefixed_lower_hex = pp.Combine(pp.Literal('0x') + pp.Word(pp.srange('[a-z0-9]'), exact=6)).setParseAction(hex_to_int) ven_in_node = pp.dictOf(pp.Literal('ven'), prefixed_lower_hex) mo_in_node = pp.dictOf(pp.Literal('mo'), prefixed_lower_hex) unit_in_node = pp.Group(prefixed_lower_hex + pp.Literal(':').suppress() + prefixed_lower_hex) units_in_node = pp.Group(pp.Literal('units') + pp.ZeroOrMore(pp.Literal('*')).suppress() + unit_in_node + pp.ZeroOrMore(pp.Literal('*')).suppress()) node_parser = subsystem_prefix + node_prefix + ven_in_node + pp.Optional(mo_in_node) + units_in_node higher_hex = pp.Word(pp.srange('[A-Z0-9]'), exact=8).setParseAction(hex_to_int) ven_in_unit = pp.dictOf(pp.Literal('ven'), higher_hex) mo_literal_in_unit = pp.dictOf(pp.Literal('mo'), higher_hex) mo_in_unit = pp.dictOf(pp.Literal('mo'), higher_hex ^ pp.Literal('*')) sp_in_unit = pp.dictOf(pp.Literal('sp'), higher_hex) ver_in_unit = pp.dictOf(pp.Literal('ver'), higher_hex) unit_parser = subsystem_prefix + ven_in_unit + mo_in_unit + sp_in_unit + ver_in_unit key_parser = node_parser ^ unit_parser ``` Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
* | network: enable DHCP broadcast flag if required by interfaceViktor Mihajlovski2021-04-212-0/+15
|/ | | | | | | | | | | | | | | | | | | | | | | Some interfaces require that the DHCPOFFER message is sent via broadcast if they can't receive unicast messages before they've been configured with an IP address. E.g., s390 ccwgroup network interfaces operating in layer3 mode face this limitation. This can prevent the interfaces from receiving an IP address via DHCP, if the have been configured for layer3. To allow DHCP over such interfaces, we're introducing a new device property ID_NET_DHCP_BROADCAST which can be set for those. The networkd DHCP client will check whether this property is set for an interface, and if so will set the broadcast flag, unless the network configuration for the interface has an explicit RequestBroadcast setting. Besides that, we're adding a udev rule to set this device property for ccwgroup devices operating in layer3 mode, which is the case if the ID_NET_DRIVER property is qeth_l3. Supercedes #18829
* Add READMEs in all .d directoriesZbigniew Jędrzejewski-Szmek2021-03-262-0/+12
|
* udev: add default group for sgx enclave accessZbigniew Jędrzejewski-Szmek2021-03-101-0/+2
| | | | | | | | | | | | | | | | | | | Closes #18669. This creates a "well known" for sgx_enclave ownership. By doing this here we avoid the risk that various projects making use of the device will provide similar-but-slightly-incompatible installation instructions, in particular using different group names. ACLs are actually a better approach to grant access to users, but not in all cases, so we want to provide a standard group anyway. Mode is 0o660, not 0o666 because this is very new code and distributions are likely to not want to give full access to all users. This might change in the future, but being conservative is a good default in the beginning. Rules for /dev/sgx_provision will be provided by libsg-ae-pce: https://github.com/intel/linux-sgx/issues/678.
* Revert "udev: do not execute hwdb builtin import twice or thrice"Zbigniew Jędrzejewski-Szmek2021-03-102-5/+3
| | | | | | | | | | | | | This reverts commit 876c75fe870846b09b54423a6b719d80bc879b27. The patch seems to cause usb devices to get some attributes set from the parent PCI device. 'hwdb' builtin has support for breaking iteration upwards on usb devices. But when '--subsystem=foo' is specified, iteration is continued. I'm sure it *could* be figured out, but it seems hard to get all the combinations correct. So let's revert to functional status quo ante, even if does the lookup more than once unnecessarily. Fixes #18125.
* rules: Move ID_SMARTCARD_READER definition to a <70 configuration.Vincent Pelletier2021-03-032-2/+2
| | | | | | | 70-uaccess.rules sets the uaccess tag on devices with ID_SMARTCARD_READER set, but it is set in 99-systemd.rules . Move this to a 60-*.rules which already matches USB CCID class, factorising the matching, so 70-uaccess.rules sets up these devices as expected.
* udev: add i2c to 60-persistent-input.rules for by-path (#18808)Tom Shield2021-03-021-2/+2
| | | | | Add the i2c subsystem to those that create by-path links. i2c devices may not have IDs so we can't rely on the by-id links but they (or some of them) should at least have a path that we can use.
* udev rules: add rule to create /dev/ptp_hypervLuca Boccassi2021-03-011-0/+2
| | | | | As for the KVM case, necessary for network cards with PTP devices when running a guest on HyperV
* no blkid for mmcblk[0-9]boot[0-9]Alan Perry2021-02-131-1/+1
| | | | | Don't run blkid on mmcblk[0-9]boot[0-9] devices because they contain bootloaders or boot parameters, and not partitions or file systems.
* udev: allow kvm group to access vhost-net deviceMarc-André Lureau2021-01-131-0/+2
| | | | | | | /dev/vhost-net is a host accelerator for virtio net devices. It has been long available and used, thus should be safe to all KVM users. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
* udev: allow kvm group to access vhost-vsock deviceMarc-André Lureau2021-01-131-0/+1
| | | | | | | | | /dev/vhost-vsock allows to setup a guest CID and running state (VHOST_VSOCK_SET_GUEST_CID, VHOST_VSOCK_SET_RUNNING) All this should be legitimate and safe for KVM users. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
* udev: make /dev/vsock 0666Marc-André Lureau2021-01-131-0/+2
| | | | | | | | | /dev/vsock supports only ioctl (the only ioctl supported is IOCTL_VM_SOCKETS_GET_LOCAL_CID), so 0666 should be okay, or 0664 if in the future we will implement some kind of write support exposed only to user/group. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
* udev-builtin-blkid: add support for --hint offsetsKarel Zak2021-01-131-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The next libblkid v2.37 is going to support session offsets for multi-session CD/DVDs. This feature is implemented by "hint offsets". These offsets are optional and prober specific (e.g., iso, udf, ...). For this purpose, the library provides a new function blkid_probe_set_hint(), and blkid(8) provides a new command-line option --hint <name>=<offset>. For CD/DVD, the offset name is "session_offset". The difference between classic --offset and the new --hint is that --offset is very restrictive and defines the probing area and the rest of the device is invisible to the library. The new --hint works like a suggestion, it provides a hint where the user assumes the filesystem, but the rest of the device is still readable for the library (for example, to get some additional superblock information etc.). If the --hint is without a value then it defaults to zero. The option --hint implementation in udev-builtin-blkid.c is backwardly compatible. If compiled against old libblkid, then the option is used in the same way as --offset. Addresses: https://github.com/karelzak/util-linux/issues/1161 Addresses: https://github.com/systemd/systemd/pull/17424
* Merge pull request #15531 from felipeborges/add-device-model-field-to-hostnamedLennart Poettering2020-12-181-0/+3
|\ | | | | hostnamed: Add "Model" field
| * rules.d: Add rule for the /sys/class/dmi/id deviceFelipe Borges2020-12-041-0/+3
| | | | | | | | See #15493
* | meson: Disable dmi_memory_id on arches without DMIwip/hadess/unsupported-dmiBastien Nocera2020-12-161-1/+4
| |
* | udev: Extract RAM properties from DMI informationBastien Nocera2020-12-162-0/+9
| | | | | | | | | | | | | | | | | | Add memory_id program to set properties about the physical memory devices in the system. This is useful on machines with removable memory modules to show how the machine can be upgraded, and on all devices to detect the actual RAM size, without relying on the OS accessible amount. Closes: #16651