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fwupd/plugins/altos
History
Mario Limonciello 8aa5d41eb7 Add external interface messages
2020-10-26 12:05:20 -05:00
..
data Add support for flashing the ChaosKey 2017-01-09 12:21:35 +00:00
altos.quirk Allow removing device flags from quirk files 2020-04-13 23:18:19 +01:00
fu-altos-device.c Add fu_device_dump_firmware() 2020-09-24 10:54:27 -05:00
fu-altos-device.h trivial: Remove G_BEGIN_DECLS from all private headers 2019-10-09 20:02:16 +01:00
fu-altos-firmware.c Use FuFirmware as a container for firmware images 2019-08-08 13:10:57 +01:00
fu-altos-firmware.h trivial: Remove G_BEGIN_DECLS from all private headers 2019-10-09 20:02:16 +01:00
fu-plugin-altos.c Set the protocol per-device not per-plugin 2019-11-25 18:01:54 +00:00
meson.build Convert libfwupdprivate to a shared library libfwupdplugin 2019-11-27 11:32:43 +00:00
README.md Add external interface messages 2020-10-26 12:05:20 -05:00

README.md

Altos Support

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

Vendor ID Security

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

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.

External interface access

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