i.MX ProcessorsのトピックRe: Panic write on imx6 NAND driver

Panic write on imx6 NAND driver

wolnet — Mon, 21 Nov 2016 11:25:05 GMT

Hi All,

I use the imx6dl controller with BSP Kernel 3.10.53 and looking for a _panic_write methode,because I have to write as fast as possible when the power get lost.

Are there any patches available that implement this feature ?

Kind regards

Wolfgang

Re: Panic write on imx6 NAND driver

igorpadykov — Tue, 22 Nov 2016 01:00:45 GMT

Hi Wolfgang

I am not aware of patches, seems one can write custom driver

catching power loss, use for example signal on Sabre board spf-27392 p.18

MAX8903C DOC output (DC UndervoltageThreshold) connected to i.MX6 EIM_CS1 or pmic :

Power fail interrupts

Best regards
igor
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Re: Panic write on imx6 NAND driver

wolnet — Tue, 22 Nov 2016 08:16:49 GMT

Hi Igor,

thank you for the link,

but the information in there is only a description how to get the information that a powerfail occured.

This is what my target already does.

In this case I disable the display backlight and other things.

One of this things is to save some data to the nand flash with the function mtd_panic_write()

I implemented this function in Kernel 3.0.43 on my own, but this changes doesn't work on Kernel 3.10.53.

Is it possible that the Kernel configuration changes this behavior ?

So what I am looking for is a implementation of _panic_write() function in gpmi_nand.c for the imx6dl controller.

Or is there any reason why this is implemented for imx23 and imx28, ... but not for imx6 ?