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How many bits SPI EEPROM does TMS320 C6727 bootloader support?

Boll
Intellectual 340 points

Hi,

 

I can not find this information in any document, just like "SPRS660 - TMS320C5505" secton 4.4:

 

9. Test for 16-bit and 24-bit SPI EEPROM boot on SPI_CS[0] with 500-KHz  ......

 

But no such information in 'spru268 - TMS320C672x" or "SPRU718B - SPI Reference Guide".

Can anyone help?

 

thanks.

Lee

  • 0
    TI__Mastermind 18130 points

    Hi Lee,

    For bootloader-related questions you should look at the C672x Bootloader App Note. The C6727B appears to allow the SPI Master/Slave to boot from 8-bit or 16-bit bit devices, but not from 24-bit devices. You would have to write a two-stage bootloader to reconfigure the SPI peripheral before communicating with a 24-bit EEPROM.

  • 0 in reply to TimHarron
    Intellectual 340 points

    Hi Tim,

    Thanks for the reply.

    It seems no such information in C672x Bootloader App Note.

    In my understanding secondary bootloader is only for FLASH/EMIF boot mode, but not for SPI master boot mode.  Is it correct?

    If not, where can I find documents to describe creating second-level bootloader for SPI bootloading, similiar to "SPRA999A - Creating a Second-Level Bootloader for FLASH Blootloading" ?

     

    According to "SPRZ232F - C672x Errata", SPI Master boot mode is not recommended with excerp as follows.

    " Advisory 1.2.2 Do Not Use SPI Master Boot Mode for Silicon Revision 1.2/C9230C100 ROM  "

    So I am planning to move other boot modes such as FLASH.

    Lee