I.MX23 Boot from SD

[johnsullivan]

Hello, I'm developing a board using the I.MX23 and I want to boot from an SD Card. Do I need to write anything to the OTP memory to do this?

I am confused about the default behavior of the SD_POWER_GATE_GPIO and SD_POWER_UP_DELAY. Do most SD card require a power up delay? Or would I be fine without it? This board is for my own education so it does not need to be very robust.

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[igorpadykov]

Hi john

two OTP bit fields in HW_OCOTP_ROM0 should be burned for SD boot:

1. SD_MBR_BOOT

2. SD_POWER_GATE_GPIO

Bitburner can be used during development.

IMX_OTP_TOOLS : A set of tools for managing OTP bits on the i.MX23 and i.MX28.

Contains BitBurner.exe, the otp_burner.py and BitInit.exe.

Best regards

igor

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[johnsullivan]

Is it required that I burn any values? It would be much simpler if I don't have to write anything to the OTP memory.

[igorpadykov]

for OTP values please read Reference Manual.

Unfortunately it would not be simpler for you without

write anything to the OTP memory

[johnsullivan]

Okay, how exactly do I write to the OTP memory? Can I use the debug UART or USB? I haven't been able to find this in the documentation.

[igorpadykov]

Bitburner can be used to write to the OTP memory

IMX_OTP_TOOLS : A set of tools for managing OTP bits on the i.MX23 and i.MX28.

Contains BitBurner.exe, the otp_burner.py and BitInit.exe.

Best regards

igor