GPMI imx6, unable to get a data line to move

[briannorman]

I'm trying to write a nand driver for an iMX6Q for Green Hills.  I'm down to the very basics and I'm having difficulties getting even a reset command to work.  I've figured out the APBH DMA set up and it appears to be working.  When i try to issue a reset to my NAND, I get my CE and CLE lines to work properly, but the data lines never move.  In the flash controller, after attempting the reset command, the GPMI_STAT indicates a RDY_TIMEOUT on Dev0.

It almost behaves like it is attempting to communicate in synchronous mode, but my nand is asynchronous, and according to the timing diagrams, won't toggle the R/B line until after the reset is complete, which it is not doing because the command was never sent.  i have verified that GPMI_CTRL1 SSYNCMODE is not asserted, and APBH_BAR is pointing to the reset command(and just incase it was reading word aligned, i filled all neighboring ram with the same command, 0xff).

Am i placing the command in the correct location, is there some other flag that i need to set for asynchronous mode?

thanks

Brian

[gusarambula]

We’re glad you found out what the problem was. If you have any more information to share on what the specific issue was maybe it can help other people as reference.

[briannorman · Accepted solution]

In case anyone comes across this, i figured it out.  My timing parameters were off.

[dhanunjaykatta]

Hi Brian Norman,

I have a doubt Imx6 Secure boot using HABv4, can we authenticate bare-metal code execution flow,like After BOOTROM will load my customized bootloader inplace of u-boot, next some RTOS? for this flow how can i use HAB library to authenticate these images?

If you answer this really helpful.

[frederikjuul]

Any information about how to set the timing params? What registers or settings did you chance to get it to work?