[flashrom] [PATCH] Add support for PicoTAP (by GOEPEL) FT2232 SPI programmer

Samir Ibradžić sibradzic at gmail.com
Fri Oct 14 20:00:45 CEST 2011


I would like to submit a patch, that enables support for another FT2232 
device, PicoTAP by GOEPEL electronic GmbH.


This device is actually a JTAG adapter, but since it uses standard 
FT2232 A interface pins, it can be easily used as SPI programmer (tested 
it here successfully). PicoTAP supports only 5V output, so one needs to 
reduce this to 3.3 in a same manner as DLP Design DLP-USB1232H 
(http://flashrom.org/FT2232SPI_Programmer). PicoTAP pin-out is as follows:

  PicoTAP |  SPI
    TCK   | SCLK
    TMS   |  CS#
    TDI   |  SO
    TDO   |  SI
   /TRST  |  -
    GND   |  GND
    +5V   |  VCC, HOLD# & WP# after 3.3V regulator

Btw, I managed to run PicoTAP in 10MHz, 15MHz and 30Mhz modes (by 
forcing DIVIDE_BY), against SST25VF016B SPI flash, read/write/erase all 
worked fine (write seems somewhat slow). For the sake of more testing, 
is there any way 20Mhz can be set in FT2232?

I am also thinking about implementing passing frequency divider as an 
option, for example:

# flashrom -p ft2232_spi:type=picotap,divider=2

DIVIDE_BY constant would be used as default. I think this parameter 
would be useful, but would like to hear more opinions.

Index: ft2232_spi.c
--- ft2232_spi.c	(revision 1450)
+++ ft2232_spi.c	(working copy)
@@ -43,6 +43,9 @@
  #define OLIMEX_ARM_OCD_H_PID	0x002B
  #define OLIMEX_ARM_TINY_H_PID	0x002A

+#define GOEPEL_VID		0x096C
+#define PICOTAP_PID		0x1449
  const struct usbdev_status devs_ft2232spi[] = {
  	{FTDI_VID, FTDI_FT2232H_PID, OK, "FTDI", "FT2232H"},
  	{FTDI_VID, FTDI_FT4232H_PID, OK, "FTDI", "FT4232H"},
@@ -53,6 +56,7 @@
+	{GOEPEL_VID, PICOTAP_PID, OK, "GOEPEL electronic GmbH", "PicoTAP"},

@@ -66,7 +70,7 @@
   * In either case, the divisor is a simple integer clock divider.
   * If clock_5x is set, this divisor divides 30MHz, else it divides 6MHz.
-#define DIVIDE_BY 3  /* e.g. '3' will give either 10MHz or 2MHz SPI 
clock. */
+#define DIVIDE_BY 1  /* e.g. '3' will give either 10MHz or 2MHz SPI 
clock. */

@@ -198,6 +202,10 @@
  			ft2232_vid = OLIMEX_VID;
  			ft2232_type = OLIMEX_ARM_TINY_H_PID;
  			ft2232_interface = INTERFACE_A;
+		} else if (!strcasecmp(arg, "picotap")) {
+			ft2232_vid = GOEPEL_VID;
+			ft2232_type = PICOTAP_PID;
+			ft2232_interface = INTERFACE_A;
  		} else {
  			msg_perr("Error: Invalid device type specified.\n");

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