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



NAME
     envr - enter nonvolatile RAM

SYNOPSIS
     envr begin_offset [end_offset | l length] [data]
AVAILABILITY
     This command is available only on RC6380 systems.
DESCRIPTION
     envr is a PROM monitor or standalone shell (sash(1M)) com-
     mand that allows you to change the contents of nonvolatile
     RAM (NVRAM). Use this command only for debugging or mainte-
     nance.
     The arguments for this command are as follows:

     begin_offset  First address at which data is to be altered.
                   It is expressed as a relative offset from the
                   NVRAM mapped-starting address (0xBE02C003).
                   The value must be hexadecimal. For example, a
                   begin_offset of 010 is mapped-address
                   0xBE02C013. Using the offset eliminates the
                   need for remembering the mapped address.
     end_offset | l length
                   Specify either end_offset to indicate the last
                   address at which data is to be altered or use
                   l length to specify the number of bytes. If
                   both are omitted, only the byte specified by
                   begin_offset is altered.
     data          Specify the data pattern.
EXAMPLES
     Write ff in NVRAM addresses 405 through 408 by entering the
     following command:

          envr 405 408 ff

     The following message appears:

          fill completed

     Check the contents of NVRAM by entering the dnvr(1prom) com-
     mand as follows:

          dnvr 400

                0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
          0400  00 a5 a5 a5 a5 ff ff ff ff a5 a5 a5 a5 a5 a5 a5

     Note that the ASCII equivalent of each byte appears in the
     rightmost columns of this display. If there is no ASCII
     equivalent, a period (.) is printed.
CAUTIONS
     The NVRAM contains information about the system environment
     and changing it can be catastrophic. Do not attempt to use



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



     this command unless you are thoroughly familiar with com-
     puter operations and how your NVRAM changes can affect them.
SEE ALSO
     dnvr(1prom), prom(1prom), sash(1M)
















































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