DPR(1prom)          RISC/os Reference Manual           DPR(1prom)



NAME
     dpr - display previous registers

SYNOPSIS
     dpr cpu_number

AVAILABILITY
     This command is available only on RC6380 systems.

DESCRIPTION
     dpr is a PROM monitor or standalone shell (sash(1M)) com-
     mand. This command displays what the registers for the
     specified CPU contained just prior to the last reset. You
     can specify the desired CPU (0 to 3) with the cpu_number
     parameter. For example, dpr 1 displays register information
     for CPU 1. Specify 0 for cpu_number on computers with only
     one processor.

     The PROM program sequence is as follows: Upon reset, the
     PROM program begins at 0xBFC00000 and starts the CPUs. Each
     CPU reads the current registers and status and puts them
     into the SET0 and 1 cache lines. After initialization is
     complete, but prior to the initial display, the PROM program
     dumps the registers from cache to the nonvolatile RAM
     (NVRAM).  When dpr executes, the registers are read from the
     NVRAM and formatted on the console display.

     Note that the PROMS EPC register shown on the display is the
     PROM and standalone shell (sash(1M)) exception program
     counter and is used only for debugging the PROM. Do not con-
     fuse it with the system EPC register.

SEE ALSO
     prom(1prom), sash(1M)


















                        Printed 11/19/92                   Page 1