Adapter

Power-On

Self-Tests

(POSTs)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Two

power-on

self-tests (POSTs) are

resident

in

the

SSA

adapter. The tests

 

POST-1 and POST-2.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

POST-1

tests

all

the

functions

that

are

necessary

to

enable

the

adapter

 

cate

with

the

Micro

Channel. POST-1

can

fail

for

either of two

reasons:

 

Ÿ

A

hardware

error

has

been detected. In

such

instances,

the

POST

code

 

a

tight

loop, and does not put the identification

of

the SSA

adapter

 

 

grammable

option select (POS) registers. If this error occurs, the SSA a

 

must

be

exchanged for

a

new

one.

 

 

 

 

 

 

 

 

 

 

 

 

Ÿ The flash erasable programmable

read-only

memory

(EPROM)

has

a

 

check

sum

 

that

is

not valid. This error can be caused

if

the

power

fails

while

 

being downloaded. In such instances, the POST checks all

the

hardware

t

 

needed

to download the microcode. If all the

hardware

is

correct,

t

 

the

ROS

level to zero, puts the identification

of the SSA adapter into

 

and

puts

error data into

the

adapter

status

register.

 

 

 

 

 

To recover from this type of error, microcode must be downloaded to adapter. If the using system can have an initial program load (IPL) wi adapter, the configuration code detects the down-level ROS code and d the latest level of code. The configuration code then uses control reg reset the adapter and restart POST-1.

If

no

error

is

detected during

POST-1, the identification

of the

SSA ada

the

POS registers, and POST-2 is started.

 

 

POST-2

tests

the

remaining

hardware

on the SSA adapter card and tests the

FRUs

that

are

attached

to

the

adapter. If this test fails, an

error

sent

to the using-system error log

when the error logger becomes

available

internal

health

check continues

to

send the error code at

regular

interva

10-2RS/6000 Enterprise Server Model H Series User's Guide

Page 236
Image 236
IBM RS/6000 manual Two Power-on Self-tests POSTs are Resident, Adapter. The tests POST-1 and POST-2, Eprom