Can not write to spi nor flash in Linux on IMX6 solo

[ivyliu]

Hi,

We have a customized board with IMX6 solo which use 64M Micron n25q512a nor flash.

We are using almost same pin assignment in SPI Nor flash part as Sabre AI board.

Spi nor flash Erasing/Reading/Writing command works properly in Uboot.

But In Linux, I can erase and read from this Nor Flash, but I can not write anything to it.

The write enable is on and I have changed pin assignment and other things in Device Tree.

Is there anything I missed to make writing work?

Thanks and Best Regards,

Ivy

[fabio_estevam]

Maybe you could post your dts here?

[ivyliu]

Hi Fabio,

Do you know how to attach a file here?

I tried to do it, but it always report the format is forbidden no matter what file extension is.

Below is part of my dts, if you need more information, please let me know.

/ {

aliases {

gpio0 = &gpio1;

gpio1 = &gpio2;

gpio2 = &gpio3;

gpio3 = &gpio4;

gpio4 = &gpio5;

gpio5 = &gpio6;

gpio6 = &gpio7;

i2c0 = &i2c1;

i2c1 = &i2c2;

i2c2 = &i2c3;

ipu0 = &ipu1;

mmc0 = &usdhc1;

mmc1 = &usdhc2;

mmc2 = &usdhc3;

mmc3 = &usdhc4;

serial0 = &uart1;

serial1 = &uart2;

serial2 = &uart3;

serial3 = &uart4;

serial4 = &uart5;

spi0 = &ecspi1;

/* spi1 = &ecspi2;

spi2 = &ecspi3;

spi3 = &ecspi4;*/

usbphy0 = &usbphy1;

usbphy1 = &usbphy2;

};

ecspi1: ecspi@02008000 {

#address-cells = <1>;

#size-cells = <0>;

compatible = "fsl,imx6q-ecspi", "fsl,imx51-ecspi";

reg = <0x02008000 0x4000>;

interrupts = <0 31 IRQ_TYPE_LEVEL_HIGH>;

clocks = <&clks IMX6QDL_CLK_ECSPI1>,

<&clks IMX6QDL_CLK_ECSPI1>;

clock-names = "ipg", "per";

dmas = <&sdma 3 7 1>, <&sdma 4 7 2>;

dma-names = "rx", "tx";

status = "disabled";

};

&ecspi1 {

fsl,spi-num-chipselects = <1>;

cs-gpios = <&gpio3 19 0>;

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_ecspi1>;

status = "okay";

/*

flash: m25p80@0 {

#address-cells = <1>;

#size-cells = <1>;

compatible = "st,m25p32";

spi-max-frequency = <20000000>;

reg = <0>;

};

*/

flash: m25p80@0 {

#address-cells = <1>;

#size-cells = <1>;

compatible = "st,n25q512a";

spi-max-frequency = <20000000>;

reg = <0>;

};

};

Thanks and Best Regards,

Ivy

[fabio_estevam · Accepted solution]

Could you try running a 4.2 kernel and in case of issues, please report to the linux-mtd mailing list.

Regards,

Fabio Estevam

[ivyliu]

Hi Fabio,

Thank you for the suggestion.

You are right, kernel 3.14.28 does not support for this Nor Flash chip.

Kernel 4.2 supports.

I just ported it from 4.2.

Now it works!

Thanks and Best Regards,

Ivy

[fabio_estevam]

Also, can you try it without enabling DMA for the SPI?