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Linux/TMS320DM368: SDCard as RAM ?

Neki
Prodigy 160 points
Part Number: TMS320DM368


Tool/software: Linux

Hi,

Is it possible to use SDCARD as RAM(With the performance completely set aside) ?

I have TI Eval Board , dvsdk_dm368-evm_4_02_00_06_setuplinux as SDK.

I read about SDCard as RAM on Android.

I want to completely remove RAM for now.

Regards

  • 0
    Genius 4030 points

    Hi,

    The query has been forwarded to respective team member.

  • 0 in reply to Anuj Kumar Gupta
    Guru 13660 points
    Hi Neki,

    You cannot use SDCard as RAM, by completely not using RAM. You can use secondary storage to create swap area, which would come into picture, when there is no memory space(pages) in RAM and then it swaps a portion of RAM to SDCard. But otherwise it is not possible to use SDCard as RAM, since SDCard does not provide Random access, other than it being slow in nature.
  • 0 in reply to Dwarakesh Radhakrishnan
    Prodigy 160 points

    Dear Dwarakesh,

    Thanks for the reply.

    I am aware of SDCard use as swap. But did not knew about its Block level access. Read that Class 10 SDCard gives a good 75MB/sec throughtput.

    I am trying to implement a System On Module with DM368 and trying to reduce components around.
    Any alternative of DM368(Internal RAM 32KB) which has internal RAM of atleast 16MB which would be sufficient for linux kernel(many subsytems removed) to run ?
    Are there any SDCard with RAM in same chip like Flash with SDRAM MCP?


    Regards
    Neiki

  • 0 in reply to Neki
    Guru 13660 points
    I am not aware of such a chip, SoC which would be having 16MB internal RAM. What is the purpose of removing RAM ? Is it for size(form-factor) or cost ? If it is for cost, a chip with 16MB internal RAM would be costly enough. How about this : www.denx.de/.../ConfigureLinuxForXIP
  • 0 in reply to Dwarakesh Radhakrishnan
    Prodigy 160 points
    Dear Dwarakesh,

    Thanks again.

    The purpose of removing RAM is only size. I can avoid NAND/NOR flash with SDCard as boot source. SDCard with wifi are available but not RAM.Strange!!

    Wifi with RAM will also be great. All done for size optimization. XIP trades with Flash which I avoided.Thanks for the link posted. It was helpful.

    hope something constructive will turnout.

    Regards
    Neki