作者：HankFu，本文转载自： 赛灵思中文社区论坛
测试工具版本：PetaLinux 2018.2
测试单板： ZCU106
UBIFS是更强壮的FLash文件系统。很多嵌入式系统都使用了UBIFS。
Xilinx PetaLinux 2018.2也支持UBIFS。只需要在Linux/U-Boot里添加相关配置选项，就能为QSPI Flash创建UBIFS。
第1步，为Linux Kernel添加UBIFS配置选项。
需要注意的是，需要去掉SPI_NOR_USE_4K_SECTORS。
CONFIG_MTD_UBI=y CONFIG_MTD_UBI_WL_THRESHOLD=4096 CONFIG_MTD_UBI_BEB_LIMIT=20 # CONFIG_MTD_UBI_FASTMAP is not set # CONFIG_MTD_UBI_GLUEBI is not set # CONFIG_MTD_UBI_BLOCK is not set CONFIG_UBIFS_FS=y # CONFIG_UBIFS_FS_ADVANCED_COMPR is not set CONFIG_UBIFS_FS_LZO=y CONFIG_UBIFS_FS_ZLIB=y CONFIG_UBIFS_ATIME_SUPPORT=y # CONFIG_UBIFS_FS_ENCRYPTION is not set CONFIG_UBIFS_FS_SECURITY=y CONFIG_CRYPTO_DEFLATE=y CONFIG_CRYPTO_LZO=y # CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is not set
第2步，为U-Boot添加UBIFS配置选项。
CONFIG_CMD_MTDPARTS=y CONFIG_MTDIDS_DEFAULT="" CONFIG_MTDPARTS_DEFAULT="" CONFIG_CMD_MTDPARTS_SPREAD=y CONFIG_CMD_UBI=y CONFIG_CMD_UBIFS=y CONFIG_MTD=y # CONFIG_CFI_FLASH is not set # CONFIG_ALTERA_QSPI is not set CONFIG_MTD_UBI=y CONFIG_MTD_UBI_WL_THRESHOLD=4096 CONFIG_MTD_UBI_BEB_LIMIT=20 # CONFIG_MTD_UBI_FASTMAP is not set CONFIG_RBTREE=y CONFIG_LZO=y
第3步，根据单板需要，定义Flash分区。
启动后，在Linux里可以通过命令 cat /proc/mtd检查。
root@zcu106_vcu_trd:/qspi_fs# cat /proc/mtd dev: size erasesize name mtd0: 01e00000 00020000 "boot" mtd1: 00040000 00020000 "bootenv" mtd2: 00c00000 00020000 "kernel" mtd3: 055c0000 00020000 "spare"
第4步，在Linux里创建和挂载UBIFS分区。
如果是第一次启动，在Linux里创建和挂载UBIFS分区。
mkdir -p /qspi_fs ubiformat /dev/mtd3 ubiattach /dev/ubi_ctrl -m 3 ubimkvol /dev/ubi0 -N qspi_ubi0 -m mount -t ubifs ubi0:qspi_ubi0 /qspi_fs
如果不是第一次启动，直接在Linux里挂载UBIFS分区。
ubiattach /dev/ubi_ctrl -m 3 mount -t ubifs ubi0:qspi_ubi0 /qspi_fs
第5步，创建分区后，在U-Boot里使用UBIFS。
sf probe 0 50000000 0 setenv partition "nor0,3" # Activate mtd3. setenv mtdids "nor0=spi0.0" setenv mtdparts "mtdparts=spi0.0:30m(boot),256k(bootenv),12m(kernel),87808k(spare)" mtdparts ubi part spare # Select mtd3. mtd ubifsmount ubi0:qspi_ubi0 ubifsls ubifsload 0x2000000 qspi_fs_ready__do_not_remove.bin.md5
更详细的在U-Boot里使用UBIFS的记录。
ZynqMP> sf probe 0 50000000 0 SF: Detected n25q512a with page size 512 Bytes, erase size 128 KiB, total 128 MiB ZynqMP> setenv partition "nor0,3" ZynqMP> setenv mtdids "nor0=spi0.0" ZynqMP> setenv mtdparts "mtdparts=spi0.0:30m(boot),256k(bootenv),12m(kernel),87808k(spare)" ZynqMP> mtdparts device nor0 <spi0.0>, # parts = 4 #: name size offset mask_flags 0: boot 0x01e00000 0x00000000 0 1: bootenv 0x00040000 0x01e00000 0 2: kernel 0x00c00000 0x01e40000 0 3: spare 0x055c0000 0x02a40000 0 active partition: nor0,3 - (spare) 0x055c0000 @ 0x02a40000 defaults: mtdids : mtdparts: ZynqMP> ubi part spare ubi0: attaching mtd2 ubi0: scanning is finished ubi0: attached mtd2 (name "mtd=3", size 85 MiB) ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 130944 bytes ubi0: min./max. I/O unit sizes: 1/512, sub-page size 1 ubi0: VID header offset: 64 (aligned 64), data offset: 128 ubi0: good PEBs: 686, bad PEBs: 0, corrupted PEBs: 0 ubi0: user volume: 1, internal volumes: 1, max. volumes count: 128 ubi0: max/mean erase counter: 1/0, WL threshold: 4096, image sequence number: 1968612066 ubi0: available PEBs: 0, total reserved PEBs: 686, PEBs reserved for bad PEB handling: 0 ZynqMP> ubifsmount ubi0:qspi_ubi0 UBIFS assert failed in ubifs_change_lp at 540 UBIFS assert failed in ubifs_release_lprops at 278 UBIFS assert failed in ubifs_change_lp at 540 UBIFS assert failed in ubifs_release_lprops at 278 UBIFS assert failed in ubifs_change_lp at 540 UBIFS assert failed in ubifs_release_lprops at 278 UBIFS assert failed in ubifs_change_lp at 540 UBIFS assert failed in ubifs_release_lprops at 278 ZynqMP> ubifsls 1024 Fri Feb 01 09:57:29 2019 qspi_fs_ready__do_not_remove.bin 76 Fri Feb 01 09:57:29 2019 qspi_fs_ready__do_not_remove.bin.md5 ZynqMP> ubifsload 0x2000000 qspi_fs_ready__do_not_remove.bin.md5 Loading file 'qspi_fs_ready__do_not_remove.bin.md5' to addr 0x02000000... Done ZynqMP> md 0x2000000 02000000: 63336432 36336334 35333664 33316537 2d3c4c36d6357e13 02000010: 65636164 31303032 61626234 62393632 dace20014bba269b
