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| 00:38.36 | gkwhc | might anyone know if its possible to load code like special peripheral functions or say like special processing algorithms only when required in RTOS? is this term called dynamically loadable libraries? |
| 00:41.11 | MonMotha | gkwhc: depends on your OS and, to some degree, your hardware |
| 00:41.11 | roxfan | that's one term |
| 00:41.16 | roxfan | overlays is another |
| 00:41.38 | MonMotha | oh, and how much work you want to do if it's not already been done for you |
| 00:42.02 | gkwhc | haha yeah. i am looking into TI's DSP/BIOS |
| 00:42.03 | roxfan | http://infocenter.arm.com/help/topic/com.arm.doc.faqs/ka4234.html |
| 00:42.09 | gkwhc | since i am using their DSP processor |
| 00:42.23 | roxfan | http://infocenter.arm.com/help/topic/com.arm.doc.dai0242a/CHDJDGCE.html |
| 00:43.38 | gkwhc | thanks, those are great resources! |
| 00:44.40 | gkwhc | tbh, it seems like designing a scalable embedded system firmware architecture is quite challenging |
| 00:45.37 | MonMotha | most systems not running a full-blown OS with memory management seem to just use the single blob firmware concept |
| 00:45.46 | MonMotha | probably because it's simple |
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| 00:46.24 | gkwhc | single blob firmware, as in no dynamic libraries/overlays? |
| 00:46.45 | MonMotha | yeh |
| 00:47.01 | MonMotha | fully statically linked at build time |
| 00:47.35 | MonMotha | that's not to say nobody does any form of dynamic loading at runtime, but many systems have more read-only (Flash) memory than they do RAM these days, so there's not a ton of reason to go to the trouble |
| 00:48.05 | MonMotha | if your system is RAM heavy but ROM limited, then that changes things a bit of course, though it still depends on if you actually run out of room in the ROM |
| 00:48.11 | MonMotha | or I guess if your ROM is not fast enough but your RAM is |
| 00:49.27 | gkwhc | yeah. considering i only have 128KB RAM to work with to implement SD card/FAT fs, USB, multiple algorithms, and loading an RTOS since the processor is RAM based |
| 00:50.06 | MonMotha | what is your non-volatile storage? |
| 00:50.16 | MonMotha | I take it it's external and probably non-linear (i.e. you can't use it for XIP) |
| 00:50.40 | gkwhc | XIP? its either going to be an SD card, or SPI flash |
| 00:50.47 | MonMotha | execute-in-place |
| 00:51.01 | MonMotha | and, without hardware support features, you can't XIP off of either of those |
| 00:51.05 | roxfan | what |
| 00:51.09 | gkwhc | i wonder if thats possible with the DSP processor |
| 00:51.10 | roxfan | what's your cpu? |
| 00:51.14 | MonMotha | though some systems have support for XIP from SPI flash, these days |
| 00:51.30 | gkwhc | TI's TMS320C553x series |
| 00:51.43 | MonMotha | wait...that's a monster... |
| 00:51.49 | MonMotha | doesn't it have an external memory bus? |
| 00:51.59 | MonMotha | (heck, probably more than one) |
| 00:52.05 | gkwhc | not the xx3x kind |
| 00:53.02 | MonMotha | I guess you just have to use the onboard peripherals to get data in and out e.g. via I2S or similar |
| 00:53.26 | MonMotha | you might also check to see if the SPI controller supports linear mapping of SPI flash |
| 00:53.28 | roxfan | the diagram says 128 KB ROM |
| 00:53.30 | MonMotha | that's starting to become popular |
| 00:54.06 | gkwhc | roxfan: i checked with TI and they said the ROM is not programmable. it contains the bootloader and other functions |
| 00:54.17 | MonMotha | yeah, that's fairly common |
| 00:54.19 | roxfan | ok |
| 00:54.49 | MonMotha | usually used to load a secondary bootloader off e.g. an SD card which then bootstraps the rest of the system, but I normally only see that arrangement on systems with an external bus so you can have "lots" of memory |
| 00:55.22 | MonMotha | (basically, things designed to have SDRAM hooked up to them) |
| 00:55.28 | gkwhc | i see |
| 00:59.55 | roxfan | i'd suggest getting the eval kit and see how big is the sample code, how much space it takes, and what it does |
| 01:00.12 | roxfan | remove stuff you don't need and see how much you have left |
| 01:00.24 | gkwhc | ok |
| 01:00.53 | gkwhc | thanks everyone! |
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