Page History

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• Discussion on boot times...
  • Just for reference: 1 second Linux Boot example (old) (not snapshot or hibernation, if I recall correctly)
    "Real-world" might be different.
• Sang-Bum: <100ms hypervisor load is generally possible.  What is the requirement?
• /TODO/ Add Sriram's notes
• architecture proposed by Sriram at the bottom of this page  is aligned with the rear camera use case
• discussion on EVS (External Video System) on top of android
• discussion on Green Hills solution
• /TODO/ Nikola upload the diagram with microRTOS based architecture (with HV as a thin layer on top of RTOS)
• RTOS is responsible for the scheduling, HV is there to enable Linux
• Nikola: goto GHS website the GHS solution is fully described there
• Nikola; you do not need to boot the whole linux to get the rearview camera up & running, you need to boot only the rtos part
• Sang bum; would you require two video streams, one coming from rtos and the later another one coming form android or linux ?
• discussion on the handover of video streams

Sriram's notes - minor edits and formatting

(Camera use-case an architecture)

- Birds Eye View / Surround View could be possibly only implemented in the Android Partition and may not be available as part of early RVC

- Following are options for supporting such a use case through out the lifetime of a IVI session ( from startup to shutdown)

                - Everything in Vehicle domain ( Basic as well as advanced view ) => No handover / arbitration required with any other domain

                - Basic implementation in Vehicle domain + Advanced implementation in Linux/Android domain => Handover / arbitration of camera stream is required

                - Everything in Linux/Android domain ( Basic as well as advanced ) =>

                - Dedicated partition ( potentially a third domain besides Vehicle and Android/Linux domain) that does everything

 
What are the implications for Hypervisor? 

- Constraint as of today in Android : Cannot do early RVC within 2 seconds.. however that is on the roadmap
- Linux does not have this constraint as it is completely Open Architecture and free from Compability aspects 

- Solutions for early camera systems

                - Snapshot / Hibernation speeds up boot and production solutions with < 2 seconds camera is possible
                - Example from a camera product( high end camera )
                - No safety aspects in consideration in the above example; non-automotive

- Load time of hypervisor ~ 100 ms

June 19

Agenda:

• VIRTIO intro
• Use Case → Architecture → Problem Statement → Results

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