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><H1
><A
NAME="FIS-LOCK-COMMAND">fis lock</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN4208"
></A
><H2
>Name</H2
>fis lock -- Lock flash area</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN4211"><H2
>Synopsis</H2
><P
><B
CLASS="COMMAND"
>fis lock</B
> {-f <TT
CLASS="REPLACEABLE"
><I
>flash_address</I
></TT
>} {-l <TT
CLASS="REPLACEABLE"
><I
>length</I
></TT
>}</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4218"
></A
><H2
>Arguments</H2
><DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN4220"><P
></P
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><THEAD
><TR
><TH
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ALIGN="LEFT"
VALIGN="TOP"
>Name</TH
><TH
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
>Type</TH
><TH
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
>Description</TH
><TH
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
>Default</TH
></TR
></THEAD
><TBODY
><TR
><TD
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="REPLACEABLE"
><I
>flash_address</I
></TT
></TD
><TD
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
>Number</TD
><TD
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
>Address of area to be locked.</TD
><TD
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
> </TD
></TR
><TR
><TD
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
><TT
CLASS="REPLACEABLE"
><I
>length</I
></TT
></TD
><TD
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
>Number</TD
><TD
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
>Length of area to be locked.</TD
><TD
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
> </TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4245"
></A
><H2
>Description</H2
><P
>This command is used to write-protect (lock) a portion of flash memory,
to prevent accidental overwriting of images. In order to make make any modifications
to the flash, a matching <B
CLASS="COMMAND"
>fis unlock</B
> command must be
issued. This command is optional and will only be provided on hardware
which can support write-protection of the flash space.</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>Depending on the system, attempting to write to write-protected flash
may generate errors or warnings, or be benignly quiet. </P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN4251"
></A
><H2
>Examples</H2
><P
>Lock an area of the flash
<TABLE
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WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>RedBoot> <TT
CLASS="USERINPUT"
><B
>fis lock -f 0xa0040000 -l 0x20000</B
></TT
>
... Lock from 0xa0040000-0xa0060000: .</PRE
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