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User's guide: mention lpc2000 checksum issue 

Folk almost certainly want to have OpenOCD compute the checksum
when they modify the vector table.  However, that almost guarantees
that "verify_image" will fail.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
This commit is contained in:
David Brownell 2010-01-20 00:04:17 -08:00
parent 44aaba3d08
commit 20d1ef70e8
1 changed files with 10 additions and 4 deletions
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doc/openocd.texi
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@ -4185,13 +4185,19 @@ which must appear in the following order:
@itemize
@item @var{variant} ... required, may be
@var{lpc2000_v1} (older LPC21xx and LPC22xx)
@var{lpc2000_v2} (LPC213x, LPC214x, LPC210[123], LPC23xx and LPC24xx)
or @var{lpc1700} (LPC175x and LPC176x)
@option{lpc2000_v1} (older LPC21xx and LPC22xx)
@option{lpc2000_v2} (LPC213x, LPC214x, LPC210[123], LPC23xx and LPC24xx)
or @option{lpc1700} (LPC175x and LPC176x)
@item @var{clock_kHz} ... the frequency, in kiloHertz,
at which the core is running
@item @var{calc_checksum} ... optional (but you probably want to provide this!),
@item @option{calc_checksum} ... optional (but you probably want to provide this!),
telling the driver to calculate a valid checksum for the exception vector table.
@quotation Note
If you don't provide @option{calc_checksum} when you're writing the vector
table, the boot ROM will almost certainly ignore your flash image.
However, if you do provide it,
with most tool chains @command{verify_image} will fail.
@end quotation
@end itemize
LPC flashes don't require the chip and bus width to be specified.