NAND Flash partition Planning

Because bootloadrer, Params, and kernel and file systems are all on NAND Flash, unified planning is required for partitions. The system's NAND Flash partition depends on the U-boot and Linux kernel settings. The NAND partition file in U-boot: Include/configs/Development Board. h: This is a parameter of phy3250. phy3250 adopts a 32 mb nand Flash with a sector size of 16 KB: 189/* phy3250's NAND Flash, 32 MB, and 16 K size (Block, sector) */190 // # define 1__env_size 0X4000/* 1 block, 16 K */191 // # define 1__env_offset 0x168000/* block 90 */The following is the smartarm3250 NAND Flash, k9f2g08, 256 MB, and the slice size is 128 K: 193/* smartarm3250's NAND Flash, k9f2g08, 256 MB, 128 K size (Block, Sector) */194 # define 1__en V_size 0x40000/* 2 block, 256 K */195 # define 1__env_offset 0x180000/* Block 12 */NAND Flash partition in the kernel NAND Flash plan the address range in different regions. The sector range is small and the bootloader 0x0000 is used. ~ 0x0018 0000 0 ~ 11 12 sectors, 1.50 m s1l and U-boot Param 0x0018 0000 ~ 0x001c 0000 12 ~ 13 2 sectors, 256 k u-boot parameter reserved 0x001c 0000 ~ 0x0020 0000 14 ~ 15 Linux kernel 0x0020 0000 ~ 0x0060 0000 16 ~ 47 32 sectors, 4.00 m Linux kernel rootfs 0x0060 0000 ~ 0x1000 0000 48 ~ 2047 2000 sectors, 250 m Linux File System

Rootfs	2047 48	2000 sectors in total
Kernel	47 16	32 sectors in total
Retained	15 14	2 sectors in total
Param	13 12	2 sectors in total
Bootlloader	11 0	12 sectors in total

Partition implementation code in linux-2.6.27.8/ARCH/ARM/mach-lpc32xx/board-smartarm3250.c: 153 # define blk_size (0x20000) // 128kb154 static struct mtd_partition _ initdata smartarm3250_nand_partition [] = {155 {156. name = "smartarm3250-boot", 157. offsets = 0,158. size = (blk_size * 12) 159}, 160 {161. name = "smartarm3250-ubt-prms", 162. offset = (blk_size * 12), 163. size = (blk_size * 2) 164}, 165 {166. name = "smartarm3250-kernel", 167. offset = (blk_size * 16), 168. size = (blk_size * 32) 169}, 170 {171. name = "smartarm3250-rootfs", 172. offset = (blk_size * 48), 173. size = mtdpart_siz_full174}, 175 };