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ft2232_spi.c: add frequency divisor parameter

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This adds an optional argument when using the ft2232_spi programmer to set
the frequency divisor. The valid values for the divisor is any even integer
between 2 and 131072.

Corresponding to flashrom svn r1537.

Signed-off-by: Samir Ibradžić <sibradzic@gmail.com>
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
This commit is contained in:
Samir Ibradžić
2012-05-15 22:58:19 +00:00
committed by Stefan Tauner
parent 901a3ba023
commit b482c6d5c1
2 changed files with 48 additions and 17 deletions
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flashrom.8
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@ -549,6 +549,17 @@ The default model is
.B 4232H
and the default interface is
.BR B .
.sp
All models supported by the ft2232_spi driver can configure the SPI clock rate by setting a divisor. The
expressible divisors are all even numbers between 2 and 2^17 (=131072) resulting in SPI clock frequencies of
6 MHz down to about 92 Hz for 12 MHz inputs. The default divisor is set to 2, but you can use another one by
specifying the optional
.B divisor
parameter with the
.sp
.B " flashrom \-p ft2232_spi:divisor=div"
.sp
syntax.
.SS
.BR "serprog " programmer
A mandatory parameter specifies either a serial