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Altera_Forum's avatar
Altera_Forum
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21 years ago

Failed to open the flash device

Hi,

I want to read the flash thru the EPCS device.

The HAL alt_flash_open_dev() always returns 0.

When I debug/trace the this function call, it seems that the HAL system can not find such device.

Does any one know how I can fix this problem?

BTW:

The system.h does contain a defintion of the flash:# define EXT_FLASH_NAME "/dev/ext_flash"# define EXT_FLASH_TYPE "altera_avalon_cfi_flash"# define EXT_FLASH_BASE 0x00000000# define EXT_FLASH_SETUP_VALUE 40# define EXT_FLASH_WAIT_VALUE 160# define EXT_FLASH_HOLD_VALUE 40# define EXT_FLASH_TIMING_UNITS "ns"# define EXT_FLASH_UNIT_MULTIPLIER 1# define EXT_FLASH_SIZE 8388608# define EXT_FLASH_CONTENTS_INFO ""

Regards,

Kwok Wong

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    21 years ago

    Hello kwokwong,

    What kind of flash, board, Nios version are you using? There has been some trouble with 16 bit flashs in 8 bit mode. Please try to use the search function of the forum to get some hints. Let us know if you have solved the problem.

    Bye,

    niosIIuser
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    21 years ago

    kwokwong,

    I'm afraid your diagnosis is incorrect,

    The system.h snippet shows that you have a CFI flash in your system, NOT an EPCS. That would require a snippet like

    # define EPCS_CONTROLLER_NAME "/dev/epcs_controller"# define EPCS_CONTROLLER_TYPE "altera_avalon_epcs_flash_controller"# define EPCS_CONTROLLER_BASE 0x02100000# define EPCS_CONTROLLER_IRQ 5# define EPCS_CONTROLLER_DATABITS 8# define EPCS_CONTROLLER_TARGETCLOCK 20# define EPCS_CONTROLLER_CLOCKUNITS "MHz"

    Do you have one of these in your system?
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    21 years ago

    --- Quote Start ---

    originally posted by rugbybloke@Dec 8 2004, 05:10 AM

    kwokwong,

    i'm afraid your diagnosis is incorrect,

    the system.h snippet shows that you have a cfi flash in your system, not an epcs. that would require a snippet like

    # define epcs_controller_name "/dev/epcs_controller"# define epcs_controller_type "altera_avalon_epcs_flash_controller"# define epcs_controller_base 0x02100000# define epcs_controller_irq 5# define epcs_controller_databits 8# define epcs_controller_targetclock 20# define epcs_controller_clockunits "mhz"

    do you have one of these in your system?

    --- Quote End ---

    Thanks rugbybloke. I did confuse the external flash with the flash connected to the EPCS controller.

    I can now 'open' the /dev/epcs_controller device to read the flash!

    Regards,

    Kwok Wong