How to set drive strength of NAND device during bootup for custom i.MX28 board?

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How to set drive strength of NAND device during bootup for custom i.MX28 board?

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torus1000
Contributor V

Hi,

I have been testing to boot up from raw nand device for custom i.MX28 board.

It looks OK but I want to try to change the drive strength of nand, just in case.

I checked manuals but I couldn't find such boot config pin(LCD_DATA*/LCD_RS) or OTP fuses.

How can I add user code and data to the (probably) FCB?

Is there any sample code?

Actually I used MT29F8G08. Please see p44 of datasheet.
http://www.arm9board.net/download/OK210/doc/MT29F8G08ABABAWP.PDF
It seems gpmi bus set command=EFh,address=10h/80h for choosing SET FEATURES and output drive strength.

Can anyone help me?

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igorpadykov
NXP Employee
NXP Employee

Hi torus1000

you are right, "change the drive strength of nand" is not supported by ROM, fuses or FCB,

one can set it in application code, use as example i.MX28 OBDS read ID command GpmiNandReadId(int num_devices)

Lab and Test Software (1)
On-Board Diagnostic Suit for the i.MX28(REV 1)
https://www.nxp.com/support/developer-resources/software-development-tools/i.mx-developer-resources/...

Best regards
igor
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768 Views
igorpadykov
NXP Employee
NXP Employee

Hi torus1000

you are right, "change the drive strength of nand" is not supported by ROM, fuses or FCB,

one can set it in application code, use as example i.MX28 OBDS read ID command GpmiNandReadId(int num_devices)

Lab and Test Software (1)
On-Board Diagnostic Suit for the i.MX28(REV 1)
https://www.nxp.com/support/developer-resources/software-development-tools/i.mx-developer-resources/...

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

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