bug #44717: avrdude creates empty flash dump

When about to write an empty flash dump file, warn about this to avoid
surprises.

Document the truncation of trailing 0xFF bytes for flash memory areas.



git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1355 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
joerg_wunsch 2015-04-09 19:50:30 +00:00
parent 608b9677c0
commit c1469e5135
4 changed files with 16 additions and 0 deletions

1
NEWS
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@ -61,6 +61,7 @@ Current:
- bug #42908: no external reset at JTAGICE3
- patch #8437: [PATCH] Serial-over-ethernet for Win32
- patch #8380: adds 500k 1M 2M baud to ser_posix.c
- bug #44717: avrdude creates empty flash dump
* Internals:
- Removing exit calls from config parser

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@ -670,6 +670,12 @@ field is no longer optional since the filename part following the colon
would otherwise be misinterpreted as
.Ar format .
.Pp
When reading any kind of flash memory area (including the various sub-areas
in Xmega devices), the resulting output file will be truncated to not contain
trailing 0xFF bytes which indicate unprogrammed (erased) memory.
Thus, if the entire memory is unprogrammed, this will result in an output
file that has no contents at all.
.Pp
As an abbreviation, the form
.Fl U Ar filename
is equivalent to specifying

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@ -717,6 +717,12 @@ Note that if @var{filename} contains a colon, the @var{format} field is
no longer optional since the filename part following the colon would
otherwise be misinterpreted as @var{format}.
When reading any kind of flash memory area (including the various sub-areas
in Xmega devices), the resulting output file will be truncated to not contain
trailing 0xFF bytes which indicate unprogrammed (erased) memory.
Thus, if the entire memory is unprogrammed, this will result in an output
file that has no contents at all.
As an abbreviation, the form @code{-U} @var{filename}
is equivalent to specifying
@code{-U} @emph{flash:w:}@var{filename}@emph{:a}.

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@ -243,6 +243,9 @@ int do_op(PROGRAMMER * pgm, struct avrpart * p, UPDATE * upd, enum updateflags f
size = rc;
if (quell_progress < 2) {
if (rc == 0)
avrdude_message(MSG_INFO, "%s: Flash is empty, resulting file has no contents.\n",
progname);
avrdude_message(MSG_INFO, "%s: writing output file \"%s\"\n",
progname,
strcmp(upd->filename, "-")==0 ? "<stdout>" : upd->filename);