SD Boot

[riteshpatel]

Hi,

I am using iMX6UL in one of my custom board design and interfaced µSD card to uSDHC2 port on iMX6UL LCD port pins. I have not used LCD in my design. LCD port is used as uSDHC2 port here.

I am not able to boot from µSD card though all boot config resistor and boot mode setting resistors are correctly loaded on board.

By referring paragraph in iMX6UL reference manual page # 273, SD card can be connected to any uSDHC port and can be booted by copying 4Kbyte of data from SD card to internal RAM.

So can i boot from uSDHC2 port on LCD port pins.?

Thanks,

Ritesh

[Yuri]

Hello,

  please refer to Table 8-18 (SD/MMC IOMUX Pin Configuration)

of i.MX 6UltraLite Applications Processor Reference Manual, Rev. 1, 04/2016 :

  The pins, multiplexed with NAND are used  for uSDHC2 boot.

Have a great day,

Yuri

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[riteshpatel]

Hi Yuri,

Thanks for your quick response.

I did review Table 8-18. But i got below information from reference manual chapter # 8, pg # 273.

This seems i can connect SD card to any uSDHC port and I can boot from that port as explained above.

Please let me know above explained SD boot process is possible or not?

Thanks,

Ritesh

[Yuri]

Hi,

   the boot ROM configures (only) NAND-related pins for uSDHC2 port.

Using other (uSDHC2) pin-mux configurations is not avaialble by the boot ROM.

Regards,

Yuri.