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How to understand :interleave,numeraseregions and regions



Hi,all,
    Could you tell me where the notation about drivers/mtd/chips/amd_flash.c in the
source code of uClinux  is?
    I want to know about 	struct amd_flash_private {
	int device_type;	
	int interleave;	
	int numchips;	
	unsigned long chipshift;
//	const char *im_name;
	struct flchip chips[0];
};

struct amd_flash_info {
	const __u16 mfr_id;
	const __u16 dev_id;
	const char *name;
	const u_long size;
	const int numeraseregions;
	const struct mtd_erase_region_info regions[4];
};
How to understand :interleave,numeraseregions and regions?

     Thank you.
 jim

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