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doc/How-flash-really-works: article written
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Dec 2023 09:08:19 +0000
parents 297c7d5b57a2
children
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297c7d5b57a2 doc/Rvinterf-logs: new document
Mychaela Falconia <falcon@freecalypso.org>
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1 The purpose of "live" output from rvinterf (stdout) is to allow FreeCalypso
297c7d5b57a2 doc/Rvinterf-logs: new document
Mychaela Falconia <falcon@freecalypso.org>
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2 developers (and tinkerer-level users) to see what the target firmware is doing
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Mychaela Falconia <falcon@freecalypso.org>
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3 in real time; the purpose of the log file created with -l option is to allow
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Mychaela Falconia <falcon@freecalypso.org>
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4 more detailed analysis at a later time. In most cases the same output lines are
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Mychaela Falconia <falcon@freecalypso.org>
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5 printed to both stdout and the log file, but there are some hex dumps of sent
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Mychaela Falconia <falcon@freecalypso.org>
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6 and received packets that are printed only to the log file when one is being
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Mychaela Falconia <falcon@freecalypso.org>
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7 written, and get printed to stdout only when there is no log file - such
297c7d5b57a2 doc/Rvinterf-logs: new document
Mychaela Falconia <falcon@freecalypso.org>
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8 exceptions are listed under the respective log item descriptions in this
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Mychaela Falconia <falcon@freecalypso.org>
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9 document.
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Mychaela Falconia <falcon@freecalypso.org>
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10
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Mychaela Falconia <falcon@freecalypso.org>
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11 For the most part, every packet sent to the target (by way of a client program
297c7d5b57a2 doc/Rvinterf-logs: new document
Mychaela Falconia <falcon@freecalypso.org>
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12 connecting to the rvinterf socket interface) and every RVTMUX packet received
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Mychaela Falconia <falcon@freecalypso.org>
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13 from the target results in a log item being printed. The only exceptions are
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Mychaela Falconia <falcon@freecalypso.org>
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14 made for certain highly voluminous packet exchanges: packets going to and from
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Mychaela Falconia <falcon@freecalypso.org>
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15 our FC-invented TCH tap mechanism are normally elided from the output, and
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Mychaela Falconia <falcon@freecalypso.org>
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16 packets emitted on the obsolete EXTUI channel (implemented only in special hack
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Mychaela Falconia <falcon@freecalypso.org>
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17 firmware versions from 2015) are also elided from stdout and log outputs when
297c7d5b57a2 doc/Rvinterf-logs: new document
Mychaela Falconia <falcon@freecalypso.org>
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18 that channel is piped to fc-lcdemu via -X option.
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Mychaela Falconia <falcon@freecalypso.org>
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19
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Mychaela Falconia <falcon@freecalypso.org>
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20 In the new logging design as of fc-host-tools-r19, various packet types of
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Mychaela Falconia <falcon@freecalypso.org>
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21 interest are logged as follows:
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Mychaela Falconia <falcon@freecalypso.org>
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22
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Mychaela Falconia <falcon@freecalypso.org>
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23 * RiViera, L1 and GPF traces are expected to be ASCII strings. However, any
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Mychaela Falconia <falcon@freecalypso.org>
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24 non-printable characters that occur in these traces (or any other context
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Mychaela Falconia <falcon@freecalypso.org>
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25 where printable ASCII is normally expected, such as ATI exchanges) are printed
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Mychaela Falconia <falcon@freecalypso.org>
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26 in C-style backslash escape form, using the following escapes: \r, \n, \0
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Mychaela Falconia <falcon@freecalypso.org>
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27 through \7 (when not followed by a digit) and \x00 through \xFF generic form.
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Mychaela Falconia <falcon@freecalypso.org>
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28 Any already-present backslashes are doubled, thus the representation is
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Mychaela Falconia <falcon@freecalypso.org>
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29 lossless. This design is a change from previous versions where we used
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Mychaela Falconia <falcon@freecalypso.org>
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30 'cat -v' notation, which is a flawed representation because it does not allow
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Mychaela Falconia <falcon@freecalypso.org>
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31 reconstruction of the original binary string.
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Mychaela Falconia <falcon@freecalypso.org>
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32
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Mychaela Falconia <falcon@freecalypso.org>
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33 * When logging TM/ETM command packets sent to the target and the target's TM
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Mychaela Falconia <falcon@freecalypso.org>
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34 response packets, rvinterf does a basic identification of what command it is,
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Mychaela Falconia <falcon@freecalypso.org>
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35 or at least which TM or ETM component. By default only a single header line
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Mychaela Falconia <falcon@freecalypso.org>
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36 is printed for each command packet and each response packet, giving this
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Mychaela Falconia <falcon@freecalypso.org>
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37 identification. In rvinterf -v mode, a full hex dump of each TM/ETM packet
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Mychaela Falconia <falcon@freecalypso.org>
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38 is also generated; if a log file is being written, this hex dump goes only to
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Mychaela Falconia <falcon@freecalypso.org>
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39 that log, otherwise it goes to stdout.
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Mychaela Falconia <falcon@freecalypso.org>
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40
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Mychaela Falconia <falcon@freecalypso.org>
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41 * Protocol stack binary primitives sent via GPF TST are printed as a header line
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Mychaela Falconia <falcon@freecalypso.org>
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42 followed by a hex dump of all payload bytes after the opcode; the hex dump
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Mychaela Falconia <falcon@freecalypso.org>
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43 portion goes only to the log if one is being written.
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Mychaela Falconia <falcon@freecalypso.org>
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44
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Mychaela Falconia <falcon@freecalypso.org>
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45 * Unrecognized packet formats on the GPF channel (old version of GPF TST as seen
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Mychaela Falconia <falcon@freecalypso.org>
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46 in the ancient 20020917 D-Sample firmware and on BenQ M32) are also printed as
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Mychaela Falconia <falcon@freecalypso.org>
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47 hex dumps, however the new hex dump format includes ASCII on the right, thus
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Mychaela Falconia <falcon@freecalypso.org>
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48 all ASCII strings emitted by those ancient firmwares will be readable.
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Mychaela Falconia <falcon@freecalypso.org>
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49
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Mychaela Falconia <falcon@freecalypso.org>
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50 * Packets that are sent and received on FC-invented TCH RVTMUX channel are
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Mychaela Falconia <falcon@freecalypso.org>
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51 normally not printed at all, as they are far too voluminous - instead a count
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Mychaela Falconia <falcon@freecalypso.org>
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52 of sent and received TCH packets is printed in between other (usually trace)
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Mychaela Falconia <falcon@freecalypso.org>
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53 packet types. To log these packets individually, run rvinterf -vv. In the
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Mychaela Falconia <falcon@freecalypso.org>
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54 latter mode, if a log file is being written, the hex dump goes only to that
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Mychaela Falconia <falcon@freecalypso.org>
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55 log, otherwise it goes to stdout.
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Mychaela Falconia <falcon@freecalypso.org>
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56
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Mychaela Falconia <falcon@freecalypso.org>
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57 * If the firmware emits packets on EXTUI RVTMUX channel (also FC-invented, but
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Mychaela Falconia <falcon@freecalypso.org>
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58 totally obsolete) but no LCD emulator pipe is created (rvinterf -X option),
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Mychaela Falconia <falcon@freecalypso.org>
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59 each received EXTUI packet is logged as a single summary line; to add a full
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Mychaela Falconia <falcon@freecalypso.org>
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60 hex dump (written to log file only if possible), run rvinterf -vv.
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Mychaela Falconia <falcon@freecalypso.org>
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61
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Mychaela Falconia <falcon@freecalypso.org>
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62 * All other/unknown sent and received packet types are always dumped in hex,
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Mychaela Falconia <falcon@freecalypso.org>
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63 both on stdout and in the log file.