branch master updated: doc: Document Berlin's hard-reset procedure.

[Tobias Geerinckx-Rice]

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     new c250626  doc: Document Berlin's hard-reset procedure.
c250626 is described below

commit c250626244f1f8a2aba36cb39440b26c67e01c53
Author: Tobias Geerinckx-Rice <me@tobias.gr>
AuthorDate: Sun Nov 26 01:00:00 2023 +0100

    doc: Document Berlin's hard-reset procedure.
    
    * doc/infra-handbook.org (Last resort: performing a hard reset of Berlin):
    New section.
---
 doc/infra-handbook.org | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/doc/infra-handbook.org b/doc/infra-handbook.org
index a5e0a8f..b76275d 100644
--- a/doc/infra-handbook.org
+++ b/doc/infra-handbook.org
@@ -135,6 +135,14 @@ After having connected to the iDRAC interface, the serial 
console can
 be entered by typing the ~console com2~ command at the ~racadm>> ~
 prompt.  To exit, press ~C-\~.
 
+** Last resort: performing a hard reset of Berlin
+
+If not even the serial console responds, it's time to use the same
+~racadm>> ~ prompt to summon an invisible hand to press the reset
+button for you, by typing ~serveraction hardreset~.
+
+Do this only if there is no other way to gracefully reboot the system.
+
 ** Repairing a non-bootable Guix System via a PXE booted image
 
 One way to fix a non-bootable Guix System is to boot a different