libftdi Archives

Subject: Re: libftdi vs. ftdi_sio

From: Paul Fox <pgf@xxxxxxxxxxxxxxxxxxxx>
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
Date: Wed, 19 Jan 2011 09:15:03 -0500
uwe wrote:
 > >>>>> "Paul" == Paul Fox <pgf@xxxxxxxxxxxxxxxxxxxx> writes:
 > 
 >     Paul> i've been out of the loop for a while, and i'm hoping this problem
 >     Paul> has been solved.
 > 
 >     Paul> i use a flash programmer that's based on the MPSSE engine of an
 >     Paul> ft4232h -- it uses the ft2232_spi.c driver in flashrom.  i also
 >     Paul> use USB-to-serial converters (often two at a time) that are
 >     Paul> ftdi-based.
 > 
 >     Paul> if i'm using the serial converters, i can't then use the
 >     Paul> programmer -- i get an error due to conflict with the kernel
 >     Paul> ftdi_sio module.  in practice, i plug the programmer into one
 >     Paul> laptop, and the serial modules into another, and ssh between them,
 >     Paul> but that's a fairly heavyweight workaround.
 > 
 >     Paul> is there a way, using API calls from either libftdi or libusb,
 >     Paul> that i can tell the kernel driver to not take ownership of my
 >     Paul> ftdi-based programmer?
 > 
 > Multiple devices without different name are doomed for failure. libftdi
 > allows to open a device with product and/or serial string. Look at the recent
 > "ftdi_usb_open_dev & ftdi_set_baudrate" thread. ft2232_spi.c and flashrom
 > need to provide a way to specify these names. Look at examples/eeprom.c or
 > how (sourceforge/svn) xc3prog handles this.
 > 
 > If your flash programmer doesn't provide a product/serial string, program
 > them with MPROG, by adapting examples/eeprom.c or with ftdi_eeprom. If the
 > flash-programmer doesn't provide the EEPROM, use the default string,
 > something like "Dual RS232" depending on chip type. If the other device also
 > has no EEPROM, you are wrecked...

thanks for the pointers.  i'll do some looking.

paul
=---------------------
 paul fox, pgf@xxxxxxxxxxxxxxxxxxxx (arlington, ma, where it's 31.5 degrees)

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