Service manual
Firmware Updates D-19
Conditions of Note When Using This Update Method
A master and slave SCM may be updated using this method but a master SCM
cannot update a slave. To update either a master or slave the device
downloading the SCMROM.HEX file must be connected physically to the target
standard I/O local port.
When updating the XSROM code, the entire system may be up and running
operating systems.
A consequence of updates to any of the microprocessors (with the exception of
the XSROM on the PSM) is that they immediately reset once the new firmware
downloads. Therefore, you want to minimize the effect of the reset on the rest of
the system by isolating the QBB/partition.
When updating a PSM, the partition in which the PSM resides should be
powered off.
When updating a PBM, the PCI I/O subsystem in which the PBM resides must
be removed from the resources available to an operating system.
When updating an HPM, the system should be powered off.
Example D–8 shows a sample master SCM update of a PSM module in QBB0.
The target device to be updated must be powered off. In this example the
PSM is assumed to be in partition 0. It is also assumed that partition 0
has been appropriately powered off using the SRM power off command
prior to the SCM power off – par 0 command.
The show csb command shows the target off and the PSM switch in the
Service position.