SUN F/E-myh001
                          1996.05.08
                         Maeng Yoonho

SUBJECT : Flash PROM Guide

DESCRIPTION

1) SUN4U SYSTEM 은 Flash PROM 을 채용.

Flash PROM jumper Setting

JUMPER | Pin 1+2 select | Pin 2+3 select |  Default   |	Signal controlled
=======|================|================|============|==================
J2002  |  FlashPROM     | Not to be Used |    1+2     |  Flash PROM SEL
J2003  |  Write Protect | Write Enable   |    1+2     |  F-PROM PROG ENABLE
J2204  | High Half Boot | Normal boot    |    2+3     |  XOR logic set



2) Flash PROM Update

- Flash PROM 은 UPGRADE CD ROM 을 통해 ROM 교체없이 UPGRADE 할 수 있다.

	ex) OBP 3.0.0 => OBP 3.0.1
           POST 1.1.19 => POST 1.5.0
        cf) upgrade 시에 **ERROR : System Security is set:
                           System firmware was not modified.
                         라는 ERROR MSG 가 발생할 경우,
                         J2003 Jumper 확인 및 OK prompt 에서 
                         security-mode variable check