[SOLVED] Linux 3.12 on AM335x NAND flash device tree... need help !

Hi All, 

I am trying to make a NAND flash working on a AM3352 custom board with the new 3.12 kernel. 

As discussed in a previous post, this custom board is tested and running on kernel 3.2, we can consider the hardware as validated.

I tried to configure the kernel with same features as the 3.2, I will not detail the kernel configuration now. 

Please find below the device tree configuration, it is copied from the EVM device tree and corresponds also to the configuration in our board file for the 3.2 kernel. 

What I see now is that there is no apparent issue in the dmesg. NAND flash is detected and identified:
[    1.067929] NAND device: Manufacturer ID: 0x2c, Chip ID: 0xdc (Micron MT29F4G08ABADAWP)

But when I list the /dev/mtd* I only have /dev/mtd0, /dev/mtd0ro and /dev/mtd0block0. 

Do someone know why I can't access the both partitions? In which file are the nodes created from the device tree partitions?

Thanks in advance, best regards

Sylvain

And another question about the gpmc range configuration that "maps" the CS0 to a "Physical address of mapping". What is this physical address of mapping ? And could someone explain me how to understand this part of documentation (Documentation/devicetree/bindings/bus/ti-gpmc.txt)

- ranges: Must be set up to reflect the memory layout with four
integer values for each chip-select line in use:

<cs-number> 0 <physical address of mapping> <size>

Currently, calculated values derived from the contents
of the per-CS register GPMC_CONFIG7 (as set up by the
bootloader) are used for the physical address decoding.
As this will change in the future, filling correct
values here is a requirement.

Here is the part of device tree dedicated to the gpmc and nand flash:

&gpmc {
  status = "okay";
  pinctrl-names = "default";
  pinctrl-0 = <&nand_pins_default>;
  ranges = <0 0 0x08000000 0x20000000>; /* CS0: NAND 512MB size, mapping addr copied from EVM ??*/

  nand@0,0 {
    ti,elm-id = <&elm>;
    reg = <0 0 0>; /* CS0, offset 0 */
    nand-bus-width = <8>;
    ti,nand-ecc-opt = "bch8";
    gpmc,device-width = <1>;
    gpmc,sync-clk-ps = <0>;
    gpmc,cs-on-ns = <0>;
    gpmc,cs-rd-off-ns = <44>;
    gpmc,cs-wr-off-ns = <44>;
    gpmc,adv-on-ns = <6>;
    gpmc,adv-rd-off-ns = <34>;
    gpmc,adv-wr-off-ns = <44>;
    gpmc,we-on-ns = <0>;
    gpmc,we-off-ns = <40>;
    gpmc,oe-on-ns = <0>;
    gpmc,oe-off-ns = <54>;
    gpmc,access-ns = <64>;
    gpmc,rd-cycle-ns = <82>;
    gpmc,wr-cycle-ns = <82>;
    gpmc,wr-access-ns = <40>;
    gpmc,wr-data-mux-bus-ns = <0>;
    gpmc,wait-on-read = "true";
    gpmc,wait-on-write = "true";
    gpmc,bus-turnaround-ns = <0>;
    gpmc,cycle2cycle-delay-ns = <0>;
    gpmc,clk-activation-ns = <0>;
    gpmc,wait-monitoring-ns = <0>;

    #address-cells = <1>;
    #size-cells = <1>;

    /* partitions go here */
    partition@1 {
    label = "BOOT";
      reg = <0x00000000 0x04000000>;
    };

    partition@2 {
      label = "ROOTFS";
      reg = <0x04000000 0x1c000000>;
    };
  };
};