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AM3874 BTMODE[14:13]

Poh Boon Teo
Intellectual 710 points

Hi,

I notice that on our TI8148 evaluation board, if I set the BTMODE[14:13] to something that other than 00b, the CPU can no longer boot up from the nand flash.

If my application need to configure to multiplex mode and still need to boot up from the flash, how do I get around this?

Please advise.

Thanks and regards,

poh boon

 

  • 0
    TI__Guru**** 170625 points

    Hi Poh,

    BTMODE[14:13] pins must be 00 (non-muxed) per AM387x ROM Code requirements, see AM387x TRM:

    4.7.3.5 Sysboot Pins for NAND Boot

    Table 4-19. Special SYSBOOT pins for NAND boot

    11.2.4.7 GPMC Address and Data Bus

    To select a NAND device, program the following register fields:
    • GPMC_CONFIG1_i[11-10] DEVICETYPE field = 10
    • GPMC_CONFIG1_i[9-8] MUXADDDATA bit = 00   ---> this one correspond to BTMODE[14:13]

    11.3.4 GPMC Configuration in NAND Mode

    BR
    Pavel