MTD partition help

MTD partition help

[Patrik Fuchs]

Hello!
I am  a complete newbie to this mtd mailing list and its subject.
I have a AMD flash  AM29F040B (512kB, 8 sectors) on a Walnut 405 GP board
and I want to partition this device. I have Hard Hat Linux 2.4.2 and I boot
it via PPC boot 1.1.5.  In the description from DENX PPC Boot and Linux
guide they say you have to define the partition in the board-specific
mapping routines, which can be seen in drivers/mtd/maps/. They took an
ICU862 board for example:
Static struct mtd_partition icu862_partitions[] = {
{   name: “kernel”,
     offset: 0,
      size: 1 << 20,
},
{
},
.
.and so on

I cannot find a similar configuration for my Walnut 405 GP board nor do I
find the maps directory in drivers/mtd. However I´ve found a file in the mtd
directory named cstm_cfi_jedec.c and I defined the partition there as a fit
of faintness.

static struct mtd_partition
cstm_cfi_jedec_partitions[PHYSMAP_NUMBER][MAX_PHYSMAP_PARTITIONS] = {
{
/*      {
                name: "main partition",
                size:  CONFIG_MTD_PHYSMAP_LEN,
                offset: 0,
        },
*/
       {                                             //example
                name: "ppcboot ",
                size: 192 << 10, // 3 Blocks
                offset: 0,
        },
        {
                name: "initrd ",                     //example
                size: 64 << 10, // 1 Block
                offset: 192 << 10,
        },
.
.and so on

But this did not work. Whenever I check the partition using  cat   /proc/mtd
I get only this:
Dev:     size     erasesize     name
…and nothing else although there are mtd entries from 0 to9 in the dev
directory.
Can someone help me out? Any hints where I am wrong? Thanx in advance
Patrik

Re: MTD partition help

[Alice Hennessy]

Patrik Fuchs wrote:

> Hello!
> I am  a complete newbie to this mtd mailing list and its subject.
> I have a AMD flash  AM29F040B (512kB, 8 sectors) on a Walnut 405 GP board
> and I want to partition this device. I have Hard Hat Linux 2.4.2 and I boot
> it via PPC boot 1.1.5.  In the description from DENX PPC Boot and Linux
> guide they say you have to define the partition in the board-specific
> mapping routines, which can be seen in drivers/mtd/maps/. They took an
> ICU862 board for example:
> Static struct mtd_partition icu862_partitions[] = {
> {   name: ?kernel?,
>      offset: 0,
>       size: 1 << 20,
> },
> {
> },
> .
> .and so on
>
> I cannot find a similar configuration for my Walnut 405 GP board nor do I
> find the maps directory in drivers/mtd. However I´ve found a file in the mtd
> directory named cstm_cfi_jedec.c and I defined the partition there as a fit
> of faintness.
>
> static struct mtd_partition
> cstm_cfi_jedec_partitions[PHYSMAP_NUMBER][MAX_PHYSMAP_PARTITIONS] = {
> {
> /*      {
>                 name: "main partition",
>                 size:  CONFIG_MTD_PHYSMAP_LEN,
>                 offset: 0,
>         },
> */
>        {                                             //example
>                 name: "ppcboot ",
>                 size: 192 << 10, // 3 Blocks
>                 offset: 0,
>         },
>         {
>                 name: "initrd ",                     //example
>                 size: 64 << 10, // 1 Block
>                 offset: 192 << 10,
>         },
> .
> .and so on
>
> But this did not work. Whenever I check the partition using  cat   /proc/mtd
> I get only this:
> Dev:     size     erasesize     name
> ?and nothing else although there are mtd entries from 0 to9 in the dev
> directory.
> Can someone help me out? Any hints where I am wrong? Thanx in advance
> Patrik
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/

What does your cstm_cfi_jedec_board_desc array look like and also
what is PHYSMAP_NUMBER defined as?   Do you see any flash related prints
in the bootup?

Alice