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The time for an RCE to complete an update can vary depending on the SDK content.
The update executes in two stages.
The first statge consists of:
1. Reception of update command from host
2. Preparation of update source
3. Sending of status response to host (Linux only)
The second stage is the exection of the update script, which performs the
actual update.
For linuxall targets, the RCE will respond with a first stage status code
and update ID. This status code is printed at completion of the
dsl_update command and may report one of several command execution failures.
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