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-rw-r--r--include/mtd/cfi_flash.h18
1 files changed, 11 insertions, 7 deletions
diff --git a/include/mtd/cfi_flash.h b/include/mtd/cfi_flash.h
index 966b5e0..b644b91 100644
--- a/include/mtd/cfi_flash.h
+++ b/include/mtd/cfi_flash.h
@@ -129,12 +129,16 @@ typedef union {
} cfiword_t;
/* CFI standard query structure */
+/* The offsets and sizes of this packed structure members correspond
+ * to the actual layout in CFI Flash chips. Some 16- and 32-bit members
+ * are unaligned and must be accessed with explicit unaligned access macros.
+ */
struct cfi_qry {
u8 qry[3];
- u16 p_id;
- u16 p_adr;
- u16 a_id;
- u16 a_adr;
+ u16 p_id; /* unaligned */
+ u16 p_adr; /* unaligned */
+ u16 a_id; /* unaligned */
+ u16 a_adr; /* unaligned */
u8 vcc_min;
u8 vcc_max;
u8 vpp_min;
@@ -148,10 +152,10 @@ struct cfi_qry {
u8 block_erase_timeout_max;
u8 chip_erase_timeout_max;
u8 dev_size;
- u16 interface_desc;
- u16 max_buf_write_size;
+ u16 interface_desc; /* aligned */
+ u16 max_buf_write_size; /* aligned */
u8 num_erase_regions;
- u32 erase_region_info[NUM_ERASE_REGIONS];
+ u32 erase_region_info[NUM_ERASE_REGIONS]; /* unaligned */
} __attribute__((packed));
struct cfi_pri_hdr {