mtd partition driver tips

mtd driver tips

(kernel: 2.6.29)

 

1>

in mips processor, build mtd partition should use physical address.

 

make menuconfig

Device Drivers  --->

Memory Technology Device (MTD) support  --->

Mapping drivers for chip access  --->

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

<*> Flash device in physical memory map

[*]   Physmap compat support

(0x1f800000) Physical start address of flash mapping

(0x800000) Physical length of flash mapping

(2)     Bank width in octets

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

 

note: start address should write 0x1f800000, not use 0xbf800000.

 

2>

 

#ifdef CONFIG_MTD_PARTITIONS
#define my_SECTOR_SIZE 0x20000
static struct mtd_partition my_partitions[] = {
    {
        .name   = "reset config",
        .size   = my_SECTOR_SIZE * 8,
        .offset = 0,
    },{
        .name   = "winmon env",
        .size   = my_SECTOR_SIZE,
        .offset = my_SECTOR_SIZE * 8,
    },{
        .name   = "area1",
        .size   = 0x2E0000,
        .offset = 0x120000
        //.mask_flags = MTD_WRITEABLE
    },{
        .name   = "bootloader",
        .size   = 0x100000,
        .offset = 0x400000,
    },{
        .name   = "area2",
        .size   = 0x300000,
        .offset = 0x500000,
        //.mask_flags = MTD_WRITEABLE
    }
};
#endif

 

static int __init physmap_init(void)
{
    int err;

    err = platform_driver_register(&physmap_flash_driver);
#ifdef CONFIG_MTD_PHYSMAP_COMPAT
-    if (err == 0)

+    if (err == 0){
+       physmap_set_partitions(ngVDSL_partitions, ARRAY_SIZE(my_partitions));
        platform_device_register(&physmap_flash);

+    }
#endif

    return err;
}