Compaq VAX 7000 Przewodnik Instalacji Pobierz pdf (Strona 25)

7.1 Important considerations when using the LFU

The LFU makes upgrading ﬁrmware on Laser platform devices fairly easy and safe, provided

a few points are taken into account:

1. On most of the modules the ﬁrmware is stored in a Flash ROM. This is a serial device

which has to be completely loaded every time, in one go. Therefore, the LFU update

must not be interrupted. If it is, the module can be left in a completely unuseable and

unrecoverable state. If this happens it has to be replaced. This implies a very slight

risk to every update due to power failure etc.

2. Upgrading the ﬁrmware on the CPU module(s) requires special care. This ﬁrmware

includes parts which affect the Operating System as well as the hardware. This means

the revisions of software and hardware must be taken into account. EG: You could

change the ﬁrmware to ﬁx a hardware bug and then ﬁnd OSF/VMS won’t boot due to a

PALcode mismatch (an extreme case to make the point!) The SID also gets changed.

3. In a multi-CPU system, all CPUs must have the same ﬁrmware revision. There is a

console UPDATE command which copies the contents of the Flash ROM from one CPU

module to another. However, this does not aways work between different revisions. So

if you’re changing the ﬁrmware revision always use the LFU.

4. Point 3 becomes especially interesting when a CPU module in a multi-CPU system has

to be replaced. The new one may be at a different ﬁrmware revision to the originals.

Therefore, the LFU will be required to bring them all into line. Therefore, the correct

version of LFU must be available on site.

5. The CPUs also have an EEPROM. The image in this has to match the Flash ROM.

You have to "build" the EEPROM every time the Flash ROM is updated, (see console

Release Notes).

6. Some other modules have a SEEPROM (serial EEPROM). At console V3.0, this also has

to be "built" after a console upgrade. Various serial number type information may be

required, (see console Release Notes).

7. If you skip versions when upgrading consoles, you must read the release notes for the

skipped versions to be aware of all changes. Also, some versions are only compatible

with the next, and so may not boot if there is a gap. This applies to downgrading too;

you may have to step up or down through each version. The bottom line, as always, is:

read the release notes!

7.2 Booting the LFU

If your system has a console RRD42, you can boot the console or update CD from that (see

below), if not you need to ﬁnd an Infoserver. See Section 8.1, Booting a 7000/10000 from a

CD in an Infoserver .

If your "console or update CD" is on tape, see Section 8.2, Putting a service on the Infoserver

system disk , or Section 7.2.3, Booting the LFU from another system .

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Compaq VAX 7000 Przewodnik Instalacji Strona 25