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fwupd/plugins/altos
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Mario Limonciello 55de39c077 trivial: reformat the whole tree to match new format
2021-08-24 11:18:40 -05:00
..
data Add support for flashing the ChaosKey 2017-01-09 12:21:35 +00:00
altos.quirk Simplify the quirk file format 2021-03-03 08:30:34 +00:00
fu-altos-device.c trivial: reformat the whole tree to match new format 2021-08-24 11:18:40 -05:00
fu-altos-device.h trivial: reformat the whole tree to match new format 2021-08-24 11:18:40 -05:00
fu-altos-firmware.c trivial: reformat the whole tree to match new format 2021-08-24 11:18:40 -05:00
fu-altos-firmware.h trivial: reformat the whole tree to match new format 2021-08-24 11:18:40 -05:00
fu-plugin-altos.c trivial: reformat the whole tree to match new format 2021-08-24 11:18:40 -05:00
meson.build Move the plugin build logic to the plugins themselves 2021-02-18 14:46:20 +00:00
README.md trivial: update markdown for pre-commit style 2021-07-18 14:42:47 -05:00

README.md

Altos

Introduction

Altos is a 8051 operating system for Altus-Metrum projects. The ChaosKey is a hardware random number generator that attaches via USB.

When the ChaosKey when inserted it appears as a device handled by the kernel with VID 0x1d50 and PID 0x60c6. If pins 1 and 5 are shorted as the device is connected then the bootloader is run, which presents VID 0xfffe and PID 0x000a.

The bootloader communication is not handled in the kernel, and a tty device is created so userspace can communicate with the hardware. Commands the bootloader accept are as follows:

Firmware Format

The daemon will decompress the cabinet archive and extract a firmware blob in ELF file format. The firmware image is inserted into the .text section.

This plugin supports the following protocol ID:

  • org.altusmetrum.altos

GUID Generation

These devices use the standard USB DeviceInstanceId values, e.g.

  • USB\VID_1D50&PID_60C6&REV_0001
  • USB\VID_1D50&PID_60C6
  • USB\VID_1D50

Update Behavior

The device usually presents in runtime mode, but on detach re-enumerates with a different USB PID in a bootloader mode. On attach the device again re-enumerates back to the runtime mode.

For this reason the REPLUG_MATCH_GUID internal device flag is used so that the bootloader and runtime modes are treated as the same device.

Vendor ID Security

The vendor ID is set from the USB vendor, in this instance set to USB:0x1D50

External Interface Access

This plugin requires read/write access to /dev/bus/usb.

List Information

Command: l\n Several lines of text about the device are transferred to the host, e.g.

    altos-loader
    manufacturer     altusmetrum.org
    product          AltosFlash
    flash-range      08001000 08008000
    software-version 1.6.8

There doesn't appear to be any kind of end-of-message signal.

Read Flash

Command: R $addr\n where $addr is a memory address 0x8001000->0x8008000. 256 bytes of raw data are then transferred to the host.

Write Flash

Command: W $addr\n where $addr is a memory address 0x8001000->0x8008000. 256 bytes of raw data are then transferred to the device.

Application Mode

Command: v\n The device will reboot into application mode. This is typically performed after flashing firmware completes successfully.