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• Patchset:

  • Patch Set #23:

    I found the problem with your chip. The code fails when readcnt != 4 […]

    I've dug much deeper into this programmer and here is an update:

    A lot of the names are misleading.

    • Only `0x43`, `0x50`, `0x78` and `0x7c` are real PCI registers.
    • All `VL805_REG_*` defines are commands send via the `0x78` register.
    • The values for the command are passed via the `0x7c` register.

    
    The values calculated and written as SPI_TRANSACTION value are for the most cases not correct. Only with 4 bytes in and out it is successful. That's the reason why it works with a `RDID4` patched W25x10 flash and SFDP compatible chips.

    Random findings:

    • The CMD_SPI_CS=0 mussed be send after CMD_SPI_TRANSACTION

    ```

    REG_MCU 0x43 - Reserved register
    REG_FWV 0x50 - Firmware Version (This is the only documented one)
    REG_CMD 0x78 - XHCI Optional Bits Configuration Address (19:0)
    REG_DAT 0x7c - XHCI Optional Bits Configuration Data (31:0)

    CMD_MAGIC_30004 0x00030004 - 0x200, unknown magic value
    CMD_SPOP_POLLING 0x0004000c - (1|0), currently not sure what's for
    CMD_PCI_WB_EN 0x00040020 - 0xffffff01 - not a clue what this is exactly for
    CMD_SPI_OUTDATA 0x000400d0 - <spi commands> + <content>
    CMD_SPI_INDATA 0x000400e0 - <content>
    CMD_SPI_TRANSACTION 0x000400f0 - 0x5__ Here lies the problem!
    CMD_CLK_DIVIDER 0x000400f8 - Default can be used, need external measurement
    CMD_SPI_CS 0x000400fc - (1|0) voltage on SPI CS Pin, needs confirmation

    ```

    So for now the right values for `CMD_SPI_TRANSACTION` is the missing mystery that needs to be solved.

    HELP NEEDED:
    If someone has a Raspberry Pi 4, I'm very interested on a strace of their vl805, closed source, update tool https://github.com/raspberrypi/rpi-eeprom
    It would be really helpful to get a `strace -x vl805 -d` log of an read, write and verify operation.

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