LayerscapeのトピックRe: LS1021a- Custom Board - NAND Chip not detected under Linux

LS1021a- Custom Board - NAND Chip not detected under Linux

sanjuvarghese — Sat, 30 Jan 2016 06:13:45 GMT

Hi,

I am facing a NAND issue under Linux. The NAND chip is working under u-boot as I can Erase/Read/Write the chip. But Linux is unable to load the NAND driver successfully. The mtd/nand/fsl_ifc_nand.c always failing in this condition

if (!fsl_ifc_ctrl_dev || !fsl_ifc_ctrl_dev->regs)

return -ENODEV;

I checked the the driver for fsl_ifc_ctrl_dev and it is getting updated in memory/fsl/ifc.c probe function(fsl_ifc_ctrl_probe). But the Linux is not calling the probe function. If I am manually allocating the memory of fsl_ifc_ctrl_dev in fsl_ifc_nand.c by adding the following lines

fsl_ifc_ctrl_dev = kzalloc(sizeof(*fsl_ifc_ctrl_dev), GFP_KERNEL);

if (!fsl_ifc_ctrl_dev)

return -ENOMEM;

Now the error moved to this location

ret = of_address_to_resource(node, 0, &res);

if (ret) {

dev_err(&dev->dev, "%s: failed to get resource\n", __func__);

return ret;

}

Here is my device tree settings

ls1021a.dtsi:

-------------

ifc: ifc@1530000 {

compatible = "fsl,ifc","simple-bus";

reg = <0x0 0x1530000 0x0 0x10000>;

interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH>;

}

ls1021aiot.dts :

----------------

&ifc {

#address-cells = <2>;

#size-cells = <1>;

ranges = <0x0 0x0 0x7e800000 0x10000>;

status = "okay";

nand@0{

#address-cells = <1>;

#size-cells = <1>;

compatible = "fsl,ifc-nand";

reg = <0x0 0 0x10000>;

bank-width = <1>;

device-width = <1>;

};

Can you please help us to solve the NAND issue in linux?

Thanks In advance

Sanju

Re: LS1021a- Custom Board - NAND Chip not detected under Linux

Pavel — Wed, 03 Feb 2016 04:11:27 GMT

Usually Linux kernel does not change IFC initialization for the NAND.

Test NAND Flash operations under u-boot.

What messages do you see for the NAND using under Linux?

Have a great day,
Pavel

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Re: LS1021a- Custom Board - NAND Chip not detected under Linux

scottwood — Fri, 05 Feb 2016 21:41:06 GMT

The memory/fsl/ifc.c driver is required. You can't replace it with a struct full of zeroes. You need to determine why it is not getting probed. What board/SoC is this? If a custom board, what do your dts and board C files look like?