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doc/DUART28-EEPROM-config article written
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 17 Sep 2020 04:18:46 +0000
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children df4bf4e06221
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f0b0970fbe2e doc/DUART28-EEPROM-config article written
Mychaela Falconia <falcon@freecalypso.org>
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1 The EEPROM on the DUART28 adapter board has two valid configurations: DUART28C
f0b0970fbe2e doc/DUART28-EEPROM-config article written
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2 and DUART28S. As of this writing the S configuration is the default shipping
f0b0970fbe2e doc/DUART28-EEPROM-config article written
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3 one, but this situation may change in the future. The difference between the
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4 two configs is in the USB VID:PID presented by the USB device, and this USB ID
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5 difference has the following practical impact:
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6
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7 * The C configuration presents a custom USB ID and requires a custom patch to
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8 the Linux kernel ftdi_sio driver in order to work - without this ftdi_sio
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9 driver patch it won't work at all. But if you do go through the pain of
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10 applying the needed patch to your Linux kernel ftdi_sio driver, the reward
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11 is that you get not only the two Calypso UARTs, but also working boot control
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12 outputs.
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13
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14 * The S configuration presents the default FT2232x USB ID and is therefore
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15 supported out of the box by the standard Linux ftdi_sio driver without needing
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16 any patches. However, the adapter's CTL1 and CTL2 outputs cannot be used in
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17 this configuration (they will be bogusly asserted whenever Channel B ttyUSB
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18 device is opened), and thus they must be left unconnected, and you don't get
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19 to play with the remote boot control feature.
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20
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21 The physical hardware is identical between the two configurations, only the
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22 EEPROM programming changes, thus end users need to be able to switch freely
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23 between the two EEPROM configs as they wish. This article explains how to
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24 program the EEPROM back and forth between the two configs.
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25
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26 Determining your current DUART28 config
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27 =======================================
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28
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29 Connect the USB cable between your DUART28 board and your Linux host, and
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30 observe dmesg output. If your DUART28 board is in the C configuration, it will
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31 present as USB ID 0403:7152, and if it is in the S config, it will present as
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32 USB ID 0403:6010. You can also see these USB IDs with lsusb. The product ID
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33 string is also programmed as "DUART28C" or "DUART28S".
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34
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35 Converting from DUART28S to DUART28C
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36 ====================================
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37
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38 If your DUART28 board is currently in the S config, its USB ID will be
f0b0970fbe2e doc/DUART28-EEPROM-config article written
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39 0403:6010, which is the default ID for FTDI's two-channel FT2232x family.
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40 Because it is the standard default, there are plenty of other gadgets using the
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41 same ID - thus you need to ensure that you have no other USB devices with the
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42 same ID connected to your system during the reprogramming operation. Run lsusb
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43 and ensure that you see only one USB device with ID 0403:6010. Ensure that this
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44 one device really is your DUART28 board: unplug that USB cable and make sure
f0b0970fbe2e doc/DUART28-EEPROM-config article written
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45 that the device disappears, plug it back in and make sure that it reappears.
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46
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47 One you have confirmed that you won't inadvertently hit some other FT2232x
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48 device, execute the actual programming command as follows (from the top
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49 directory of this code repository):
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50
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51 ftee-gen2232c eeproms/duart28c $Serial | fteeprom-prog i:0x0403:0x6010
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52
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53 (See FTDI-EEPROM-tools article for other ways to specify the target device to
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54 fteeprom-prog.)
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55
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56 Replace the $Serial metavariable with the 3-digit serial number of your DUART28
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57 adapter board as it appears on the factory serial number sticker.
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58
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59 After this operation completes successfully, unplug and replug the USB cable
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60 between the DUART28 board and your host - the adapter should now show up with
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61 USB ID 0403:7152.
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62
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63 Converting from DUART28C to DUART28S
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64 ====================================
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65
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66 If your DUART28 board is currently in the C config, its USB ID will be
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67 0403:7152, which is a private ID that belongs to us and should not be used by
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68 other parties. The reverse conversion command is as follows:
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69
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70 ftee-gen2232c eeproms/duart28s $Serial | fteeprom-prog i:0x0403:0x7152