imx25 NF_BOOT_WITH_RESET signal

[ernstzberg]

As i'm using a nand flash to boot and it requests a reset command before any read/write command.

My question is how to control the NF_BOOT_WITH_RESET signal? Should I use a pin at boot? Should I use a bit of the fusebox?

[Yuri · Accepted solution]

  The i.MX25 external (direct) boot is affected by the (RESET -0xFF) issue,

which means - no reset  command (0xFF) is issued before boot.

In this case, please use internal boot, when the i.MX25 internal bootloader

issues the NAND reset command (0xFF) as first command after power up during NAND

boot.

   Also note, ONFI NANDs have a timeout behavior : even if it hasn't received the

0xFF reset command, after timeout it will also be ready for access. 

So, power up delay between NAND is powered on and IMX25 starts NAND access may

be used as a workaround.

In the same time the i.MX25 internal (ROM) bootloader issues the NAND reset

command (0xFF) as first command after power up during NAND boot.

This means only internal boot mode of the i.MX25 should be used.

Have a great day,
Yuri

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