[Design] PSU firmware update

[Vernon Mauery]

On 04-Jun-2019 10:58 AM, Lei YU wrote:
>On Tue, Jun 4, 2019 at 1:23 AM Neeraj Ladkani <neladk at microsoft.com> wrote:
>>
>> 1. Why host power off is a pre-condition? We should add this a PSU pre-requisite to support Live upgrade and activation.
>
>Derek's reply explains the reason why we want to the host power off as
>pre-condition.

I don't think host power off should be a requirement. Our power supplies 
run safely in their bootloader while doing a firmware update and can 
keep the power on.

--Vernon

>> 2. How should PSU update impact PSU and battery monitoring ? should there be coordination between sensor monitoring task during update ?
>
>This is a good point. During PSU update, the driver probably should be unbind,
>and after the update is one, rebind the driver.
>Does that sounds OK?
>
>> 3. PSU may have multiple regions like bootloader, active region and inactive region. We should design to support multiple region update.
>
>I do not have detailed information about this, which is more suitable to let
>the vendor-specific tool to handle the multiple regions.
>What do you think?
>
>> 4. Can you propose required SEL logs and telemetry requirements as well ?
>
>While I was writing this design doc, I was not thinking about the detailed SEL
>logs.
>Will need some time to discuss this and see if it shall be covered in this doc
>or not.