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serprog: Add support for setting the SPI frequency

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Introduce a new opcode (0x14) that sends the requested frequency as a 32b
long value in Hertz to the programmer and receives the frequency eventually
chosen by the programmer. The user can specify this with the programmer
parameter "spispeed" (named after the similar parameter for the buspirate)
including an optional suffix of 'M' or 'k' for specifying megahertz or kilohertz
respectively (lowercase suffixes are also accepted).

Thanks to Idwer and Uwe (and maybe others) for their feedback especially
regarding the unit of frequency to use.

Corresponding to flashrom svn r1571.

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:
Stefan Tauner
2012-08-13 16:33:04 +00:00
parent a1a14ec5d2
commit b98f6eb3ac
3 changed files with 68 additions and 1 deletions
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12
flashrom.8
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@ -598,7 +598,17 @@ syntax and for IP, you have to use
.sp
.B " flashrom \-p serprog:ip=ipaddr:port"
.sp
instead. More information about serprog is available in
instead. In case the device supports it, you can set the SPI clock frequency
with the optional
.B spispeed
parameter. The frequency is parsed as Hertz, unless an
.BR M ", or " k
suffix is given, then megahertz or kilohertz are used respectively.
Example that sets the frequency to 2 MHz:
.sp
.B "flashrom \-p serprog:dev=/dev/device:baud,spispeed=2M"
.sp
More information about serprog is available in
.B serprog-protocol.txt
in the source distribution.
.SS