iMX-RT1175 SPI NOR Boot

[danielberhe]

Hi All,

I'm having issues booting my custom IMXRT1175AVM8A based board. I'm using Micron MT25QL256ABA1EW7 flash chip and it is wired as shown below:

I used a modified version of the SDK flexspi sample project (see attachement) to test the flash and the test succeeds when it is linked to RAM. I modified the sample project to use one pad instead of 4 as the function flexspi_nor_enable_quad_mode was writing to the status register to enable quad mode but enabling quad on my flash device is done by writing to a different register. I'm currently modifying the project further to enable quad properly.

I've modified the nor config struct:

const flexspi_nor_config_t qspiflash_config = {
    .memConfig =
        {
            .tag              = FLEXSPI_CFG_BLK_TAG,
            .version          = FLEXSPI_CFG_BLK_VERSION,
            .readSampleClksrc=kFlexSPIReadSampleClk_LoopbackInternally,
            .csHoldTime       = 3u,
            .csSetupTime      = 3u,
            // Enable DDR mode, Wordaddassable, Safe configuration, Differential clock
            .controllerMiscOption = 0x10,
            .deviceType           = kFlexSpiDeviceType_SerialNOR,
            .sflashPadType        = kFlexSpiSerialClk_60MHz,
            .serialClkFreq        = kFlexSpiSerialClk_60MHz,
            .sflashA1Size         = 32u * 1024u * 1024u,
            .lookupTable =
                {
                    // Read LUTs
                    [0] = FLEXSPI_LUT_SEQ(CMD_SDR, FLEXSPI_1PAD, 0xEB, RADDR_SDR, FLEXSPI_1PAD, 0x18),
                    [1] = FLEXSPI_LUT_SEQ(DUMMY_SDR, FLEXSPI_1PAD, 0x06, READ_SDR, FLEXSPI_1PAD, 0x04),

                    // Read Status LUTs
                    [4 * 1 + 0] = FLEXSPI_LUT_SEQ(CMD_SDR, FLEXSPI_1PAD, 0x05, READ_SDR, FLEXSPI_1PAD, 0x04),

                    // Write Enable LUTs
                    [4 * 3 + 0] = FLEXSPI_LUT_SEQ(CMD_SDR, FLEXSPI_1PAD, 0x06, STOP, FLEXSPI_1PAD, 0x0),

                    // Erase Sector LUTs
                    [4 * 5 + 0] = FLEXSPI_LUT_SEQ(CMD_SDR, FLEXSPI_1PAD, 0x20, RADDR_SDR, FLEXSPI_1PAD, 0x18),

                    // Erase Block LUTs
                    [4 * 8 + 0] = FLEXSPI_LUT_SEQ(CMD_SDR, FLEXSPI_1PAD, 0xD8, RADDR_SDR, FLEXSPI_1PAD, 0x18),

                    // Pape Program LUTs
                    [4 * 9 + 0] = FLEXSPI_LUT_SEQ(CMD_SDR, FLEXSPI_1PAD, 0x02, RADDR_SDR, FLEXSPI_1PAD, 0x18),
                    [4 * 9 + 1] = FLEXSPI_LUT_SEQ(WRITE_SDR, FLEXSPI_1PAD, 0x04, STOP, FLEXSPI_1PAD, 0x0),

                    // Erase Chip LUTs
                    [4 * 11 + 0] = FLEXSPI_LUT_SEQ(CMD_SDR, FLEXSPI_1PAD, 0x60, STOP, FLEXSPI_1PAD, 0x0),
                },
        },
    .pageSize           = 256u,
    .sectorSize         = 4u * 1024u,
    .ipcmdSerialClkFreq = 0x1,
    .blockSize          = 64u * 1024u,
    .isUniformBlockSize = false,
};

Due to a hardware design error I currently don't have access to UART1 or USB1 so I can't use blhost or something similar to serial download or burn fuses that way. So I modified the OCOTP SDK sample project to burn BT_FUSE_SEL. I set EXAMPLE_OCOTP_FUSE_MAP_ADDRESS to 0x16 and EXAMPLE_OCOTP_FUSE_WRITE_VALUE to 0x10.

I checked what's in flash using J-Link and it looks correct but I will do byte by byte comparison to be on the safe side.

Attempting to debug any of my projects fails and I see this

I've checked that pins BOOT_MODE[1:0] are set to 00.

Can anyone see where I'm going wrong?

Thanks,

Daniel

[nxf77486]

Hello,

Can you please help me by giving a look into the following application note that can be useful.

[danielberhe]

Hello,

I have had a look at the document but didn't find any information to help solve my issue. I cannot use MFG tool with my custom board because as there was a hardware design error and the board cannot be found either through USB or UART when in serial download mode.

[nxf77486]

Hello

Also please find the hardware development guide that can be helpful for you custom board design.

[danielberhe]

Thank you for the link. We are already aware of the hardware issue on our custom board and the design issue will be fixed on the next revision.

Am I to understand that the only way to solve my issue is by using MFGTool and I can't do it through MCUXpresso?

[danielberhe]

Hello,

Apologies for the late reply. I didn't receive a notification email for some reason. I will have a read and report back.

Thanks,

Daniel