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89 lines
2.4 KiB
Markdown
89 lines
2.4 KiB
Markdown
# Hardware Information and Status
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The hardware infomation and status is handled by the YANG model [IETF
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hardware][1], with deviations and augmentations in _infix-hardware_.
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## USB Ports
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For Infix to be able to control USB port(s), a device tree modification
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is needed (see _alder.dtsi_ for full example).
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```
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chosen {
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infix {
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usb-ports = <&cp0_usb3_1>;
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usb-port-names = "USB";
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};
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};
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```
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Two USB ports are also exposed in QEMU for test purpose.
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All USB ports in the system will be disabled during boot due to the file
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`board/common/rootfs/etc/modprobe.d/usbcore.conf`. If you do not want
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Infix to control USB port(s), remove the file or manually enable the USB
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bus, here is an example:
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```
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# Enable the bus
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echo 1 > /sys/bus/usb/devices/usb1/authorized
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```
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And then enable sub-devices (e.g. USB memory)
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```
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# Enable a device plugged into usb1
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echo 1 > /sys/bus/usb/devices/usb1/1-1/authorized
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```
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### Current status
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```
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admin@example:/> show hardware
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USB PORTS
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NAME STATE
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USB unlocked
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```
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An USB port can be in two states _unlocked_ and _locked_. When a port is
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locked, all connected devices will get power, but never authorized by
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Linux to use.
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### Configure USB port
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> **Note:** You can only configure USB ports known to the system. See
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> `show hardware` in admin-exec context. (Use `do` prefix in configure
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> context.)
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```
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admin@example:/> configure
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admin@example:/config/> set hardware component USB state admin-state unlocked
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admin@example:/config/> leave
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admin@example:/>
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```
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### Using a USB Stick
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With the USB port unlocked, a memory stick can be used to expand the
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storage of the device. Plug it in, either directly, or via a USB hub.
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All partitions of *VFAT* or *exFAT* type are automatically mounted to
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the `/media/<LABLEL>` directory, e.g., `/media/memorystick`, or if a
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partition does not have a label, using the kernel device name, e.g.,
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`/media/sda`.
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Depending on the partition type the the media is either mounted in
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`flush` or `sync` mode to ensure files are properly flushed to the
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backing store of the memory stick. This to protect against users
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yanking out a device before file(s) have been written to it.
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The only way currently to safely "eject" a USB memory stick is to use
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`umount` command from a UNIX shell, which explicitly synchronizes any
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cached data to disk before returning the prompt:
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```
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admin@example:~$ sudo umount /media/log
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```
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[1]: https://www.rfc-editor.org/rfc/rfc8348.html
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