Changeset 1493 for trunk/flashrom.8

Feb 15, 2012, 11:40:23 PM (4 years ago)

Warn of one-time programmable (OTP) memory

Some flash chips contain OTP memory that we cannot read or write (yet). This
prohibits us from cloning them, hence warn the user if we detect it. Not all
variations of the tagged chips contain OTP memory. They are often only
enabled on request or have there own ordering numbers. There is usually no
way to distinguish them. Because this is a supposedly seldomly used feature
the warning is shown in with dbg verbosity.

The manpage is extended to describe the backgrounds a bit.

This patch is based on the idea and code of Daniel Lenski.
Signed-off-by: Daniel Lenski <dlenski@…>
Signed-off-by: Stefan Tauner <stefan.tauner@…>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@…>

1 edited


  • trunk/flashrom.8

    r1490 r1493  
    672672.B ""
     674One-time programmable (OTP) memory and unique IDs
     676Some flash chips contain OTP memory often denoted as "security registers".
     677They usually have a capacity in the range of some bytes to a few hundred
     678bytes and can be used to give devices unique IDs etc. flashrom is not able
     679to read or write these memories and may therefore not be able to duplicate a
     680chip completely. For chip types known to include OTP memories a warning is
     681printed when they are detected.
     683Similar to OTP memories are unique, factory programmed, unforgeable IDs.
     684They are not modifiable by the user at all.
    673686.SH LICENSE
    674687.B flashrom
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