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docs: update roadmap

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# Planned Features
atmosphère has a number of features that are either works-in-progress or planned. Please note that while time-estimates are given, they are loose, and things may be completed sooner or later than advertised.
The following descriptions were last updated on June 15th, 2020.
The following descriptions were last updated on June 28th, 2020.
## system updater api
* **Description**: A planned extension api for stratosphere (tenatively `ams:su`), this will provide an interface for homebrew to safely install system upgrades or downgrades. This will allow for much more easily transitioning safely between different versions of the operating system.
* **Development Status**: Backend/implementation completed; final stages (user-facing ipc api) to be written by SciresM.
* **Estimated Time**: June 2020
## system updater homebrew
* **Description**: A user homebrew making use of the new system updater api, so that users can actually use the new api in practice.
* **Development Status**: Initial revision complete, pending re-write by Adubbz.
* **Completion Time**: June-July 2020
## ams-on-mariko
* **Description**: Atmosphere cannot run as-is on Mariko hardware. A large number of changes are needed in many components. Although exosphere's rewrite laid most groundwork on the secure monitor side, there is still work to do there -- and additional work is needed on the bootloader and stratosphere sides as well. Mariko support will also require further design thought; atmosphere's debugging design heavily relies on reboot-to-payload and (more generally) the ability to perform warmboot bootrom hax at will. This is not possible on Mariko, and will require a new design/software support for whatever solution is chosen.
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* **Description**: General system stability improvements to enhance the user's experience.
* **Development Status**: Undergoing active development by all members of the atmosphère team.
* **Estimated Time**: June 15th.
# Completed features
The following features were previously included under the planned features section and are now complete.
Please note that this is not an exhaustive list of features present in atmosphère, and only serves to indicate what from the above has been completed.
## system updater api
* **Description**: A planned extension api for stratosphere (tenatively `ams:su`), this will provide an interface for homebrew to safely install system upgrades or downgrades. This will allow for much more easily transitioning safely between different versions of the operating system.
* **Completion Time**: June 2020
## exosphere re-write
* **Description**: exosphère, atmosphère's reimplementation of Horizon's Secure Monitor, was the first component authored for the project in early 2018. It is written in C, and in a style very different from the rest of atmosphère's code. In addition, exosphère was written to conform to constraints that no longer apply in an environment where it is not launched from the web browser, and where using a custom firmware image to orchestrate wake-from-sleep is possible. exosphère currently uses all but 1 KB of the space available to it, putting it at risk of breaking as future firmware updates are supported. A re-write will solve these issues.
* **Completion Time**: June 2020