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C5515 EVM Boot from NOR Flash

Jason Matalka
Prodigy 115 points

I am having a lot of trouble using the 5515EVM to boot from NOR Flash on CS2.  I am able to write the data and properly verify it, but the boot-loader does not seem to recognize the valid code.  When I start the debugger without any sort of initialization, I get all 0x0080's, which seems to indicate the flash is in status mode rather than read mode.  Lightly tapping pin4 of U29 (1.8V Reset) to ground causes the data in flash to display correctly.

According to the TI bootloader documentation:
"The bootloader requires NOR Flash that supports a reset command (0xF0 on data)."

The part number for the flash memory is: PC28F128P30T85A

Looking at the memory datasheet, I don't see any mention of a 0xF0 reset.  Does that mean there's no way I can boot from it?

Thanks,
-Jason

  • 0
    TI__Genius 12575 points

    Hi,

    With respect to boot from NOR flash, the bootloader requires NOR Flash that supports a reset command (0xF0 on data).

    So its required to choose the NAND flash device which supports reset command otherwise it wouldn't work. The bootloader application note also provides information on list of supported NOR flash devices.

    Hope this clarifies.

    Regards

     Vasanth