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><H1
><A
NAME="CKSUM-COMMAND">cksum</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN3155"
></A
><H2
>Name</H2
>cksum -- Compute POSIX checksums</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN3158"><H2
>Synopsis</H2
><P
><B
CLASS="COMMAND"
>cksum</B
> {-b <TT
CLASS="REPLACEABLE"
><I
>location</I
></TT
>} {-l <TT
CLASS="REPLACEABLE"
><I
>length</I
></TT
>}</P
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>Arguments</H2
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></P
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><THEAD
><TR
><TH
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>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"
>-b <TT
CLASS="REPLACEABLE"
><I
>location</I
></TT
></TD
><TD
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
>Memory address</TD
><TD
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
>Location in memory for stat of data.</TD
><TD
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
><SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>none</I
></SPAN
></TD
></TR
><TR
><TD
WIDTH="25%"
ALIGN="LEFT"
VALIGN="TOP"
>-l <TT
CLASS="REPLACEABLE"
><I
>length</I
></TT
></TD
><TD
WIDTH="25%"
ALIGN="LEFT"
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>Number</TD
><TD
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ALIGN="LEFT"
VALIGN="TOP"
>Length of data</TD
><TD
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><SPAN
CLASS="emphasis"
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>none</I
></SPAN
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><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN3194"
></A
><H2
>Description</H2
><P
>Computes the POSIX checksum on a range of memory (either RAM or FLASH).
The values printed (decimal cksum, decimal length, hexadecimal cksum,
hexadecimal length) can be compared with the output from the Linux program 'cksum'.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN3197"
></A
><H2
>Examples</H2
><P
>Checksum a buffer.
<TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>
RedBoot> <TT
CLASS="USERINPUT"
><B
>cksum -b 0x100000 -l 0x100</B
></TT
>
POSIX cksum = 3286483632 256 (0xc3e3c2b0 0x00000100)</PRE
></TD
></TR
></TABLE
>
</P
><P
>Checksum an area of memory after loading a file. Note that the base
address and length parameters are provided by the preceding
load command.
<TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>
RedBoot> <TT
CLASS="USERINPUT"
><B
>load -r -b %{FREEMEMLO} redboot.bin</B
></TT
>
Raw file loaded 0x06012800-0x0602f0a8
RedBoot> <TT
CLASS="USERINPUT"
><B
>cksum</B
></TT
>
Computing cksum for area 0x06012800-0x0602f0a8
POSIX cksum = 2092197813 116904 (0x7cb467b5 0x0001c8a8)</PRE
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>
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