Attention is currently required from: Angel Pons, Peter Farley.

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• Commit Message:

  • Patch Set #1, Line 9: FT232H-based devices are unable to read over 256 bytes of flash in one

    ftdi_read_data: -1, usb bulk read failed

    Hmmm, looks at least like something one could debug further in libftdi. I'm also
    on Arch and just updated libftdi and libusb to the latest, still works...

    There are two possible issues to consider: Is the amount of data limited per
    MPSSE_DO_READ command or per individual USB transfer.

    For the latter there's a max-packet-size in the USB descriptor (see `lsusb -v`
    mine says "wMaxPacketSize 0x0200 1x 512 bytes" for both IN and OUT endpoints).
    However, this is something the USB stack should take care of (if the descriptor
    is valid).

    I've played around with ftdi_read_data_set_chunksize(). This limits the size
    of transfers libftdi requests from libusb. It actually only works as long as
    I keep it above and a multiple of 512.

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