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doc/CP2102-EEPROM-tools: article started
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 28 Sep 2023 06:35:39 +0000
parents dbaf239436cf
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1 The EEPROM on the DUART28 adapter board has two valid configurations: DUART28C
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2 and DUART28S. As of this writing the S configuration is the default shipping
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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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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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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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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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26 Using fc-duart28-conf utility
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27 =============================
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29 The present fc-usbser-tools package includes a specialized high-level utility
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30 for examining and changing DUART28 adapter configuration. This utility has two
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31 operation modes:
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33 fc-duart28-conf show -- check and show current configuration
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34 fc-duart28-conf set C|S -- set new config by programming the EEPROM
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36 The show command is completely non-invasive: it looks through the system tree
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37 of connected USB devices, looking for a DUART28 adapter (as identified not only
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38 by USB VID:PID, but also by manufacturer and product ID strings), and if it
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39 finds a DUART28 device, the tool reports its current configuration.
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41 The set command is invasive by necessity, as the fundamental identity of the
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42 connected USB device is being changed: the tool commands the Linux kernel to
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43 unbind the ftdi_sio driver from both interfaces (both ttyUSB devices disappear),
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44 checks the current EEPROM configuration, and then reprograms it for the new
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45 desired config. Once the operation completes, the DUART28 adapter needs to be
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46 unplugged and replugged for the EEPROM change to take effect and for the
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47 ftdi_sio driver to rebind.
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49 Unless you intentionally fool it by programming DUART28C or DUART28S EEPROM
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50 config into some other FTDI device, fc-duart28-conf cannot hit a non-DUART28
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51 USB device by mistake: VID:PID, manufacturer ID string and product ID string
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52 all have to match either DUART28C or DUART28S. If you have multiple DUART28
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53 adapters plugged in, the tool will hit the first one it finds - not a
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54 recommended arrangement, but also one which is not expected to arise by
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55 accident.
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57 Manual programming with ftee-gen2232c and fteeprom-prog
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58 =======================================================
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60 In order to be safe in terms of not accidentally hitting some other FTDI-based
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61 USB device, fc-duart28-conf requires the current state of the DUART28 adapter
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62 to be either valid DUART28C or valid DUART28S. Under ordinary expected usage
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63 this requirement is not a problem, but if you somehow manage to totally hose
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64 your adapter's EEPROM, then fc-duart28-conf won't be able to recover it. If
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65 you find yourself in the latter situation, see DUART28-EEPROM-manual article
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66 for the older manual method which is always possible.