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History

Richard Hughes bfd946e463 Use '#pragma once' to avoid a lot of boilerplate		2019-02-09 08:42:30 -06:00
..
data	Add support for flashing the ChaosKey	2017-01-09 12:21:35 +00:00
altos.quirk	Change the quirk file structure to be more efficient	2018-06-28 13:32:30 +01:00
fu-altos-device.c	Add shared functionality for reading and writing with O_NONBLOCK	2018-12-06 14:07:02 +00:00
fu-altos-device.h	Use '#pragma once' to avoid a lot of boilerplate	2019-02-09 08:42:30 -06:00
fu-altos-firmware.c	Remove the unused Emacs indenting headers from all source files	2018-08-09 12:48:04 +01:00
fu-altos-firmware.h	Use '#pragma once' to avoid a lot of boilerplate	2019-02-09 08:42:30 -06:00
fu-plugin-altos.c	Show a console warning if loading an out-of-tree plugin	2019-01-19 07:26:20 +00:00
meson.build	Show a console warning if loading an out-of-tree plugin	2019-01-19 07:26:20 +00:00
README.md	trivial: Add the missing protocol IDs to the plugin READMEs	2019-01-29 22:28:09 +00:00

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

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.