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doc/Loadtools-performance: flash programming added
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 24 Feb 2020 22:30:00 +0000
parents c847d742ab38
children 39b74c39d914
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1 Here are the expected run times for the flash dump2bin operation of dumping the
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2 entire flash content of a Calypso GSM device:
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3
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4 Dump of 4 MiB flash (e.g., Openmoko GTA01/02 or Mot C139/140) at 115200 baud:
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5 12m53s
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6
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7 The same 4 MiB flash dump at 812500 baud: 1m50s
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9 Dump of 8 MiB flash (e.g., Mot C155/156) at 812500 baud: 3m40s
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11 Because of the architecture of fc-loadtool and its loadagent back-end, the run
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12 time of a flash dump operation depends only on the serial baud rate and the
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13 size of the flash area to be dumped; it should not depend on the USB-serial
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14 adapter type or any host system properties, as long as the host system and
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15 serial adapter combination supports the desired baud rate. In contrast, flash
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16 programming and fc-xram loading operations are quite different in that their
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17 run times do depend on the host system and USB-serial adapter or other serial
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18 port hardware - this host system dependency exists because of the way these
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19 operations are implemented in our architecture.
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20
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21 Here is one example of expected flash programming time: flashing a FreeCalypso
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22 Magnetite hybrid fw image (2378084 bytes) into an FCDEV3B board (S71PL129N
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23 flash chip) via an FT2232D adapter at 812500 baud takes 2m11s on the Mother's
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24 Slackware 14.2 system. This time is just for the flash program-bin operation,
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25 not counting the flash erase which must be done first. Flash erase times are
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26 determined entirely by physical processes inside the flash chip and are not
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27 affected by software design or the serial link: for each sector to be erased,
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28 fc-loadtool issues the sector erase command to the flash chip and then polls
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29 the chip for operation completion status; the polling is done over the serial
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30 link and thus may seem very slow, but the extra bit of latency added by the
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31 finite polling speed is still negligible compared to the time of the actual
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32 sector erase operation inside the flash chip. In contrast, the execution time
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33 of a flash program-bin operation is a sum of 3 components:
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35 * The time it takes for the bits to be transferred over the serial link;
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36 * The time it takes for the flash programming operation to complete on the
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37 target (physics inside the flash chip);
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38 * The overhead of command-response exchanges between fc-loadtool and loadagent.
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39
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40 [To be continued]