Re: GPMC in device tree

On Sun, 2015-08-09 at 22:18 +0300, Ran Shalit wrote:

On Sun, Aug 9, 2015 at 9:27 AM, Ran Shalit [off-list ref] wrote:

quoted

Hi ,

I reboot the board, with the new device tree localbus, but I don't
have any new /dev/mtdX entry for the NOR flash.
There is no HW issue, becuase we can R/W access the NOR flash from u-boot.
Is there any hint what can be the issue here ? I've checked in kernel
config and validated that mtd is supported.
The NOR flash is S29GL512P , SPANSION.

 localbus@e0005000{
#address-cells = <2>;
#size-cells = <1>;
   compatible = "fsl,mpc8349-localbus", "simple-bus";
    reg = <0xe0005000 0x1000>;
    interrupts = <77 0x8>;
    interrupt-parent = <&ipic>;


# NOR and NAND Flashes
  ranges = <0x0 0x0 0xff800000 0x00800000
    0x1 0x0 0xF8000000 0x08000000
    0x2 0x0 0xf7e00000 0x00200000>;

You have overlap between cs0 and cs1.

quoted

nor@0,0 {
#address-cells = <1>;
#size-cells = <1>;
compatible = "cfi-flash";
reg = <0x0 0x0 0x00800000>;
#bank-width = <1>;
device-width = <1>;

It's "bank-width", not "#bank-width".

quoted

};
};

Best Regards,
Ran

Hello,

Just to update,
I eventually solved this issue.
I don't do any configuration in device tree. All BRx configuration is
already done in u-boot (as was done from the start), and everything
seems to work OK: cpld, nvram.

For NOR FPGA I only added NOR configuration to kernel:

CONFIG_MTD_PHYSMAP=y
CONFIG_MTD_PHYSMAP_START=0xf8000000
CONFIG_MTD_PHYSMAP_LEN=0x7800000
CONFIG_MTD_PHYSMAP_BANKWIDTH=4

I don't recommend this.  You're bypassing the device tree entirely.

Why did you put bankwidth 4 here, but bankwidth 1 in the device tere?

-Scott