.size = (0x300000 - 0x40000), /* last 256KB is yamon env */ //这块给自解压 //的压缩内核，最后留了点给booterloader的环境变量，它没有被设备驱动使用，而是由booterloader以自己的方式访问。
.offset = MTDPART_OFS_APPEND,
}
};
如果你增加或者是减少了你的flash空间（通过增加或减少flash芯片）或则你想调整几个分区的大小，你只需要修改这个表就可以了。
如果你还有一块NAND区，那么你可能有如下的分区表（au1550nd.c）：
const static struct mtd_partition partition_info[] = {
{
.name = "NAND FS 0",
.offset = 0,
.size = 8*1024*1024
},
{
.name = "NAND FS 1",
.offset = MTDPART_OFS_APPEND,
.size = MTDPART_SIZ_FULL
}
};
整个alchemy_flash.c就两个函数： alchemy_mtd_init(void)和 alchemy_mtd_cleanup()。
int __init alchemy_mtd_init(void)
{
struct mtd_partition *parts;
int nb_parts = 0;
unsigned long window_addr;
unsigned long window_size;
/* Default flash buswidth */
alchemy_map.bankwidth = BOARD_FLASH_WIDTH;
window_addr = 0x20000000 - BOARD_FLASH_SIZE;
window_size = BOARD_FLASH_SIZE;
#ifdef CONFIG_MIPS_MIRAGE_WHY
/* Boot ROM flash bank only; no user bank */
window_addr = 0x1C000000;
window_size = 0x04000000;
/* USERFS from 0x1C00 0000 to 0x1FC00000 */
alchemy_partitions[0].size = 0x03C00000;
#endif
/*
* Static partition definition selection
*/
parts = alchemy_partitions;
nb_parts = NB_OF(alchemy_partitions);
alchemy_map.size = window_size;
/*
* Now let's probe for the actual flash. Do it here since
* specific machine settings might have been set above.
*/
printk(KERN_NOTICE BOARD_MAP_NAME ": probing %d-bit flash bus\n",
alchemy_map.bankwidth*8);
alchemy_map.virt = ioremap(window_addr, window_size);
mymtd = do_map_probe("cfi_probe", &alchemy_map);
if (!mymtd) {
iounmap(alchemy_map.virt);
return -ENXIO;
}
mymtd->owner = THIS_MODULE;
add_mtd_partitions(mymtd, parts, nb_parts);
return 0;
}