NOTICE: The Processors Wiki will End-of-Life in December of 2020. It is recommended to download any files or other content you may need that are hosted on processors.wiki.ti.com. The site is now set to read only.

NAND BOOT on DM6437

From Texas Instruments Wiki
Jump to: navigation, search

Q: I am unable to boot from Nand on DM6437. I have generated an AIS image and had flashed in Nand device using nand_writer utility (a CCS project provided in the same package as genAIS utility). When I reset the board, it failed to boot from Nand.

Answer:

First, make sure of the below settings:

Set JP2 jumper to NAND on the EVM, set the SW2 switches to 0011 (AEM[2..1]=001, AEAW2=1) and the SW1 switches to 11101XXX (BM[3..0]=0111, FASTBOOT=1)

Also, check the ROM code revision to ensure that the ROM is a PG1.3 device because, according to advisory 1.2.10, in the current silicon errata document, it is specified that PG1.2 does not support NAND boot.

Using PG1.3 device, which is a latest ROM version, I could boot successfully from the NAND device.

Q: The BOOTCMPLT register ERR field contents show "A" (1010). What is significance of "A" (1010)? Could not find why we are getting this error.

Answer:

The error conditions for the ROM boot loader are as follows:

typedef enum {

    ERR_UNKNOWN_COMMAND = 1,
    ERR_BAD_MAGIC_NUMBER,
    ERR_TRANSMIT_SYNC,
    ERR_BAD_CRC,
    ERR_INVALID_ADDRESS_SIZE,
    ERR_UNSUPPORTED_BOOTMODE,
    ERR_TIMEOUT_WAITING_FOR_HOST,
    ERR_TIMEOUT_I2C_BUS_BUSY,
    ERR_TIMEOUT_MCBSP_SPI_RECEIVE,
    ERR_NAND_ACCESS_TIMEOUT,
    ERR_RECEPTION_ERR,       
    ERR_BAD_FUNCTION_PTR,
    ERR_PLL_LOCKUP,
    ERR_CFG_FUNCTION_CALL

} TISTDBOOTErrCodes;

So the error indicates that the access to the NAND device is taking too long (i.e., the device is not indicating it's readiness in a timely manner, or maybe not at all).