Hi Andrew,

Unsure how it can work for you, but this is the corresponding entry from the Excito release:

---
/*****************************************************************************

         * 2048KB SPI Flash on Boot Device (Numonyx MP25P16)

 ****************************************************************************/

        

        static struct mtd_partition bubba3_flash_parts[] = {

         {

         .name = "u-boot",

         .size = SZ_512K+SZ_256K,

         .offset = 0,

         },

         {

         .name = "env",

         .size = SZ_128K,

         .offset = MTDPART_OFS_NXTBLK,

         },

         {

         .name = "data",

         .size = MTDPART_SIZ_FULL,

         .offset = MTDPART_OFS_NXTBLK,

         },

        };

        

        static const struct flash_platform_data bubba3_flash = {

         .type = "m25p16",

         .name = "spi_flash",

         .parts = bubba3_flash_parts,

         .nr_parts = ARRAY_SIZE(bubba3_flash_parts),

        };

        

        static struct spi_board_info __initdata bubba3_spi_slave_info[]
        = {

         {

         .modalias = "m25p80",

         .platform_data = &bubba3_flash,

         .irq = -1,

         .max_speed_hz = 40000000,

         .bus_num = 0,

         .chip_select = 0,

         },

        };

        ---

        

        I originally started out with a kernel build by user 'sakaki-'
        on git

        (project gentoo-on-b3) and found that it had no access to MTD.
        The

        readme on this project also states that the front led on the B3
        will

        go off for some 40 seconds or so and then go back on, which is
        achieved

        by an openrc script after sysfs is mounted.

        

        The behaviour we're seeing therefore seems to contradict what
        you must

        be seeing, since you explicitly turn the green led off which
        would

        indicate that the leds default to 'on' position in your case
        while on

        multiple B3's we've now confirmed that the default is in fact
        off and

        blue and red should be explicitly turned on.

        

        As for MTD access I found that sakaki's original kernel did not
        have

        CONFIG_MTD_M25P80 enabled but this did not fix access to MTD
        (see 

        discussion at
        http://forum.mybubba.org/viewtopic.php?f=7&t=5680&start=16

        ). Only after I changed the driver 'compatible' reference to
        match 

        m25p80 I got access to MTD (with that very same kernel).

        

        As you may know, being a B3 owner, performing a shutdown
        requires

        writing a 'magic' DWORD value to a specific location in mtd2 and
        mtd1

        holds a key that is required for a dyndns service that is
        exclusive for

        Excito B3 owners.

        

        The submitted MTD patch has been confirmed to fix the issue on
        four

        different B3's now, running gentoo patched kernels version
        3.17.1, 3.18.3

        and 3.18.5.

        

        

        Regards,

        Gordon Bos
On 07/02/2015 17:09, Andrew Lunn wrote: