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Altera_Forum's avatar
Altera_Forum
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20 years ago

EPCS Filesystem

I don't think this has been done, but has anyone looked into getting a EPCS driver in uClinux for a filesysteM? I was thinking of doing this as it didn't seem too hard, but it would be my first attempt at driver work, so I thought I would get some feedback first. I have >4 Megs free on my EPCS device, and it would be cool if I could get a FS on it.

5 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    I didn't see the EPCS driver. too.

    Maybe you can add it to driver/mtd/chips dir.
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    That''s what I was thinking. One thing that came to mind was Altera doesn't let you directly access the EPCS device without using their HAL calls. Is it still possible to make a kernel driver using these calls?

    J
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    Hi jdhar,

    > has anyone looked into getting a EPCS driver in uClinux for a filesysteM?

    It has been on my todo list for a while ... and is quickly coming to a head.

    > Altera doesn't let you directly access the EPCS device without using their

    > HAL calls. Is it still possible to make a kernel driver using these calls?

    It's possible ... but not necessary. u-boot has a fairly complete set of epcs access

    routines you can use as a starting point.

    I'm waiting for some hardware at the moment ... once it arrives I'll be able to

    help with this effort. Right now, I don't have any boards with a large enough

    device to be useful.

    Regards,

    --Scott
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    I would be willing to put some time into this, especially knowing that there are some people here who could help me out.

    I was actually just looking at the src code for all the epcs routines, and they are in fact just SPI calls, which translate to IORD/IOWRs... so I was going to figure out how to get those in uclinux. I guess the simple way is just to use pointers since the address space is all available.

    On a higher level, I figure taking a simple MTD device and stripping it down should be simple enough - especially since there much simpler write/erase algorithms involved with the EPCS (at least compared to CFI for eg.)

    If you decide to get around to it quicker than I however, I do have plenty of boards available to test any drivers on.
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    You can also take the sources from

    altera/kits/nios2/components/altera_avalon_epcs_flash_controller/sdk or HAL