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annotate doc/Calypso-chip-versions @ 999:30fad2b3afd2

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doc/Flash-write-protection: document flash lock-state retrieval
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 04 Dec 2023 20:40:50 +0000
parents a449ae0a1cec
children
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a449ae0a1cec better documentation for calversion
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1 There have been many different versions of the Calypso silicon made over the
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2 years, including hardware differences, at least 3 ARM boot ROM versions and at
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3 least 3 DSP ROM versions. New target utility calversion (to be run via fc-iram)
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4 helps identify unknown Calypso chip versions: it reports the ARM boot ROM
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5 version, the DSP ROM version and the values read from the few documented ID
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6 registers.
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7
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8 In order to be able to use our calversion utility to identify an unknown Calypso
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9 variant, the Calypso device under examination needs to satisfy the following
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10 two requirements:
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11
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12 * The boot ROM needs to be enabled by nIBOOT pin strapping on the board, in
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13 order to be able to get in with fc-iram;
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14
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15 * The Calypso chip version to be identified needs to be Calypso C05 rev B or
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16 later, containing ARM boot ROM version 0200 or 0300. This limitation exists
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17 because our target-utils framework on which calversion is based depends on being
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18 booted by a known Calypso boot ROM version in order to figure out which UART it
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19 should use for communication. If anyone encounters a device with a Calypso C05
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20 rev A chip in it, you will need to somehow read out its boot ROM, send us that
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21 boot ROM dump, and we will extend our UART detection logic in target-utils to
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22 support that ancient boot ROM version which is currently unknown to us.
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23
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24 If you have a Calypso boot ROM version which is not currently supported by our
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25 target-utils, how can you read it out? The simplest way (assuming that nIBOOT
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26 is strapped low on the board to enable the boot ROM) would be to edit
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27 target-utils/libcommon/uartsel.c in your local copy, hard-code whichever UART
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28 you are using in the uart_select_init() function, removing the boot ROM
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29 version-dependent autodetection code, rebuild calversion and loadagent with
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30 this hack, and use the modified loadagent with fc-loadtool to dump the ROM.
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31 Alternatively, if the boot ROM is disabled with nIBOOT strapped high, you may
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32 be able to read it out via JTAG, or perhaps via fc-memdump if the device
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33 already runs some compatible firmware.
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34
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35 Back to our calversion utility, if you have a Calypso device with a not-quite-
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36 known chip version in it and you are able to get in with fc-loadtool, you can
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37 run calversion on it as follows:
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38
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39 fc-iram /dev/ttyXXX /opt/freecalypso/target-bin/calversion.srec
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40
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41 You should get output that looks like this:
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42
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43 Calypso version ID program running
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44 Loaded via boot ROM v0300, UART 0 (MODEM) at baud rate #0
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45 CLKTCXO input autodetected to be 26 MHz
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46 Device ID code: 0xB496
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47 Device version code: 0x0000
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48 ARM ID code: 0xFFF3
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49 cDSP ID code: 0x0128
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50 Releasing DSP core from reset
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51 Waiting for DSP bootloader READY status
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52 Loading NDB parameters
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53 Loading PARAM area
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54 Booting DSP main code
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55 DSP reports version 0x3606 0x0000
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56
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57 You should be able to see which of the two supported boot ROM versions (0200 or
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58 0300) your Calypso chip has, which UART was used to load the code, whether your
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59 board uses a 13 MHz or a 26 MHz clock (this is a board-level property, not a
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60 property of the Calypso chip), what values are reported in the device ID
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61 registers, and the last bit which takes the most work to obtain - the DSP ROM
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62 version.
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63
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64 The boot ROM version and the CLKTCXO input frequency are also reported when you
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65 run fc-loadtool, and the device ID registers can be trivially read with the r16
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66 command once you are in loadtool, but getting the DSP ROM version requires
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67 putting the DSP through its messy boot process, which is why a special program
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68 had to be written for the task.