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Diffstat (limited to 'system/doc')
| -rw-r--r-- | system/doc/design_principles/appup_cookbook.xml | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/system/doc/design_principles/appup_cookbook.xml b/system/doc/design_principles/appup_cookbook.xml index eebe6ba7b4..798b23d847 100644 --- a/system/doc/design_principles/appup_cookbook.xml +++ b/system/doc/design_principles/appup_cookbook.xml @@ -640,5 +640,23 @@ code_change(_OldVsn, State, port) -> updates etc. can be used without having to specify <c>.appup</c> files.</p> </section> + + <section> + <title>Emulator Upgrade from pre OTP R15</title> + <p>From OTP R15, an emulator upgrade is performed by restarting + the emulator with new versions of the core applications + (<c>kernel</c>, <c>stdlib</c> and <c>sasl</c>) before loading code + and running upgrade instruction for other applications. For this + to work, the release to upgrade from must includes OTP R15 or + later. For the case where the release to upgrade from includes an + earlier emulator version, <c>systools:make_relup</c> will create a + backwards compatible relup file. This means that all upgrade + instructions will be executed before the emulator is + restarted. The new application code will therefore be loaded into + the old emulator. If the new code is compiled with the new + emulator, there might be cases where the beam format has changed + and beam files can not be loaded. To overcome this problem, the + new code should be compiled with the old emulator.</p> + </section> </chapter> |