U-Boot1.3.1中JFFS2文件系统支持和U盘支持的使用备忘 - Bootloader

U-Boot1.3.1中JFFS2文件系统支持和U盘支持的使用备忘

在U-Boot可能早就有了对JFFS2和U盘的支持，但是由于我没有移植是注意到，就没有使用。在这次的移植中，我通过往网上的资料在开发板的配置文件中添加了对这两项的支持，并使用成功。在这里写下备忘，以备后用.

一、U-Boot对JFFS2文件系统的支持

我在include/configs/tekkaman2440.h文件中添加了：

#define CONFIG_CMD_JFFS2 /*JFFS2 Support */ #undef CONFIG_JFFS2_CMDLINE #define CONFIG_JFFS2_NAND 1 #define CONFIG_JFFS2_DEV "nand0" #define CONFIG_JFFS2_PART_SIZE 0x4c0000 #define CONFIG_JFFS2_PART_OFFSET 0x40000 /*JFFS2 Support */

解释：
CONFIG_CMD_JFFS2 ：使能对JFFS2相关命令的支持；
CONFIG_JFFS2_CMDLINE ：若添加了此项定义，会加上对MTD的支持。但是要使用nand驱动，而不是nand_legacy驱动。对于我这次移植改动会很大，所以暂不用；
CONFIG_JFFS2_NAND ：使能JFFS2文件系统在NAND FLASH上的支持；
CONFIG_JFFS2_DEV ：定义JFFS2文件系统所在的存储设备。若对于NOR FLASH 为"nor0"；
CONFIG_JFFS2_PART_SIZE ：定义JFFS2文件系统分区大小。
CONFIG_JFFS2_PART_OFFSET ：定义JFFS2文件系统分区所在存储设备的起始偏移地址；

U-Boot还支持多分区的JFFS2文件系统，我还未做实验。
注意：即使是JFFS2 in NAND Flash，也不要使用\doc\README.JFFS2_NAND中介绍的CONFIG_JFFS2_NAND_DEV、CONFIG_JFFS2_NAND_OFF、CONFIG_JFFS2_NAND_SIZE 来配置，现在这些定义还未使用，是为以后的扩展设置的。一开始我也被骗了。

配置好以上定义后，编译，下载到板子。
以下是我使用一个JFFS2分区来存放内核，在启动时由U-Boot读取，并启动内核的操作过程：
首先，在HOST上将U-Boot处理过的内核做成JFFS2镜像，镜像大小为 0x4c0000 字节。（mkfs.jffs2的使用在我的《在嵌入式Linux系统中挂载 jffs2 根文件系统》一文中有介绍）

[tekkamanninja@Tekkaman-Ninja mtd-utils.git]$ ./mkfs.jffs2 -r /home/tekkamanninja/working/nfs/boot -o boot.jffs2 -e 0x4000 --pad=0x4c0000 -s 0x200 -n

以下就是开发板的操作：

U-Boot 1.3.1 (Feb 18 2008 - 14:41:39) DRAM: 64 MB Flash: 1 MB NAND: NAND flash probing at 0x4E000000 64 MB In: serial Out: serial Err: serial Hit any key to stop autoboot: 0 [Tekkaman2440]#nfs 0x30008000 192.168.1.22:/home/tekkamanninja/working/nfs/boot.jffs2;nand erase 0x40000 0x4c0000 dm9000 i/o: 0x20000300, id: 0x90000a46 MAC: 08:08:08:08:12:27 operating at 100M full duplex mode File transfer via NFS from server 192.168.1.22; our IP address is 192.168.1.2 Filename '/home/tekkamanninja/working/nfs/boot.jffs2'. Load address: 0x30008000 Loading: ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ############################################################### done Bytes transferred = 4980736 (4c0000 hex) NAND erase: device 0 offset 262144, size 4980736 ... OK [Tekkaman2440]#nand write.jffs2 0x30008000 0x40000 0x4c0000 NAND write: device 0 offset 262144, size 4980736 ... 4980736 bytes written: OK [Tekkaman2440]#ls Scanning JFFS2 FS: . done. -rw-rw-r-- 1600504 Mon Feb 18 06:36:05 2008 zImage.img [Tekkaman2440]#fsload zImage.img;bootm ### JFFS2 loading 'zImage.img' to 0x30008000 ### JFFS2 load complete: 1600504 bytes loaded to 0x30008000 ## Booting image at 30008000 ... Image Name: tekkamanninja Created: 2008-02-18 6:36:04 UTC Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 1600440 Bytes = 1.5 MB Load Address: 30008000 Entry Point: 30008040 Verifying Checksum ... OK XIP Kernel Image ... OK Starting kernel ... Uncompressing Linux........................................................................................................ done, booting the kernel. Linux version 2.6.24 (tekkamanninja@Tekkaman-Ninja) (gcc version 4.1.1) #2 Mon Feb 18 14:35:35 CST 2008 CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177 Machine: Tekkaman2440 Memory policy: ECC disabled, Data cache writeback CPU S3C2440A (id 0x32440001) S3C244X: core 405.000 MHz, memory 101.250 MHz, peripheral 50.625 MHz S3C24XX Clocks, (c) 2004 Simtec Electronics CLOCK: Slow mode (1.500 MHz), fast, MPLL on, UPLL on CPU0: D VIVT write-back cache CPU0: I cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets CPU0: D cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256 Kernel command line: noinitrd root=/dev/mtdblock4 rootfstype=jffs2 rw console=ttySAC0,115200 init=/linuxrc mem=64M irq: clearing pending ext status 00000200 irq: clearing subpending status 00000003 irq: clearing subpending status 00000002 PID hash table entries: 256 (order: 8, 1024 bytes) timer tcon=00500000, tcnt a4ca, tcfg 00000200,00000000, usec 00001e57 Console: colour dummy device 80x30 console [ttySAC0] enabled Dentry cache hash table entries: 8192 (order: 3, 32768 bytes) Inode-cache hash table entries: 4096 (order: 2, 16384 bytes) Memory: 64MB = 64MB total Memory: 61464KB available (2960K code, 306K data, 120K init) Mount-cache hash table entries: 512 CPU: Testing write buffer coherency: ok net_namespace: 64 bytes NET: Registered protocol family 16 S3C2410 Power Management, (c) 2004 Simtec Electronics S3C2440: Initialising architecture S3C2440: IRQ Support S3C2440: Clock Support, DVS off S3C24XX DMA Driver, (c) 2003-2004,2006 Simtec Electronics DMA channel 0 at c4800000, irq 33 DMA channel 1 at c4800040, irq 34 DMA channel 2 at c4800080, irq 35 DMA channel 3 at c48000c0, irq 36 usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb NET: Registered protocol family 2 IP route cache hash table entries: 1024 (order: 0, 4096 bytes) TCP established hash table entries: 2048 (order: 2, 16384 bytes) TCP bind hash table entries: 2048 (order: 1, 8192 bytes) TCP: Hash tables configured (established 2048 bind 2048) TCP reno registered NetWinder Floating Point Emulator V0.97 (double precision) JFFS2 version 2.2. (NAND) ? 2001-2006 Red Hat, Inc. fuse init (API version 7.9) yaffs Feb 15 2008 10:10:34 Installing. io scheduler noop registered io scheduler anticipatory registered (default) io scheduler deadline registered io scheduler cfq registered Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled s3c2440-uart.0: s3c2410_serial0 at MMIO 0x50000000 (irq = 70) is a S3C2440 s3c2440-uart.1: s3c2410_serial1 at MMIO 0x50004000 (irq = 73) is a S3C2440 s3c2440-uart.2: s3c2410_serial2 at MMIO 0x50008000 (irq = 76) is a S3C2440 RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize loop: module loaded dm9000 Ethernet Driver eth0: dm9000 at f6100300,f6100304 IRQ 51 MAC: 08:08:08:08:12:27 Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx S3C24XX NAND Driver, (c) 2004 Simtec Electronics s3c2440-nand s3c2440-nand: Tacls=1, 9ns Twrph0=4 39ns, Twrph1=1 9ns NAND device: Manufacturer ID: 0xec, Chip ID: 0x76 (Samsung NAND 64MiB 3,3V 8-bit) Scanning device for bad blocks Bad eraseblock 3579 at 0x037ec000 Creating 7 MTD partitions on "NAND 64MiB 3,3V 8-bit": 0x00000000-0x00030000 : "U-Boot-1.3.1" 0x00030000-0x00040000 : "U-Boot-1.3.1 Parameter" 0x00040000-0x00500000 : "Linux2.6.24 Kernel(JFFS2)" 0x00500000-0x00a00000 : "Root(cramfs)" 0x00a00000-0x00f00000 : "Root(JFFS2)" 0x00f00000-0x01400000 : "Root(YAFFS)" 0x01400000-0x04000000 : "DATA" usbmon: debugfs is not available s3c2410-ohci s3c2410-ohci: S3C24XX OHCI s3c2410-ohci s3c2410-ohci: new USB bus registered, assigned bus number 1 s3c2410-ohci s3c2410-ohci: irq 42, io mem 0x49000000 usb usb1: configuration #1 chosen from 1 choice hub 1-0:1.0: USB hub found hub 1-0:1.0: 2 ports detected mice: PS/2 mouse device common for all mice S3C24XX RTC, (c) 2004,2006 Simtec Electronics s3c2410-rtc s3c2410-rtc: rtc disabled, re-enabling s3c2410-rtc s3c2410-rtc: rtc core: registered s3c as rtc0 s3c2440-i2c s3c2440-i2c: slave address 0x10 s3c2440-i2c s3c2440-i2c: bus frequency set to 98 KHz s3c2440-i2c s3c2440-i2c: i2c-0: S3C I2C adapter S3C2410 Watchdog Timer, (c) 2004 Simtec Electronics s3c2410-wdt s3c2410-wdt: watchdog inactive, reset disabled, irq enabled TCP cubic registered NET: Registered protocol family 1 RPC: Registered udp transport module. RPC: Registered tcp transport module. s3c2410-rtc s3c2410-rtc: setting system clock to 2008-02-18 14:47:35 UTC (1203346055) Empty flash at 0x0042eeb0 ends at 0x0042f000 VFS: Mounted root (jffs2 filesystem). Freeing init memory: 120K init started: BusyBox v1.9.1 (2008-02-16 15:04:08 CST) starting pid 779, tty '': '/etc/init.d/rcS' ----------mount all ----------Starting mdev...... ********************************************************* Tekkaman Ninja 2440 Rootfs(nfs) 2008.2 Love Linux ! ******************************************************** starting pid 783, tty '': '/bin/login' (none) login: root Password: login[783]: root login on 'console' Processing /etc/profile... Set search library path in /etc/profile Set user path in /etc/profile Set PS1 in /etc/profile Done [root@~]#mount -t jffs2 /dev/mtdblock2 /mnt/jffs2/ [root@~]#ls -l /mnt/jffs2/ -rw-rw-r-- 1 501 501 1600504 Feb 18 06:36 zImage.img

二、U-Boot对U盘读取的支持。（似乎只支持普通U盘，不支持读卡器之类的USB存储设备）
我在include/configs/tekkaman2440.h文件中添加了：

#define CONFIG_CMD_USB #define CONFIG_CMD_FAT /* USB Support 080218 */ #define CONFIG_USB_OHCI #define CONFIG_USB_STORAGE #define CONFIG_USB_KEYBOARD #define CONFIG_DOS_PARTITION #define CFG_DEVICE_DEREGISTER #define CONFIG_SUPPORT_VFAT #define LITTLEENDIAN /* USB Support 080218 */

解释：
CONFIG_CMD_USB ：使能USB相关命令的支持
CONFIG_CMD_FAT ：使能FAT文件系统相关命令的支持
CONFIG_USB_OHCI ：使能USB_OHCI协议的支持
CONFIG_USB_STORAGE：使能USB存储设备的支持
CONFIG_DOS_PARTITION ：使能FAT文件系统分区的支持
CONFIG_SUPPORT_VFAT ：使能FAT32文件系统的支持
LITTLEENDIAN ：定义数据为小端模式
CFG_DEVICE_DEREGISTER和CONFIG_USB_KEYBOARD是对USB键盘的支持（本次未使用）

配置好以上定义后，编译，下载到板子。
以下是我使用U盘来存放内核，在启动时由U-Boot读取，并启动内核的操作过程：
首先将U-Boot处理过的内核存入U盘，以下就是开发板的操作：

U-Boot 1.3.1 (Feb 18 2008 - 16:04:40) DRAM: 64 MB Flash: 1 MB NAND: NAND flash probing at 0x4E000000 64 MB In: serial Out: serial Err: serial Hit any key to stop autoboot: 0 [Tekkaman2440]#usb start (Re)start USB... USB: scanning bus for devices... 2 USB Device(s) found scanning bus for storage devices... 1 Storage Device(s) found [Tekkaman2440]#fatls usb 0 . 1600504 zimage.img . 1 file(s), 0 dir(s) [Tekkaman2440]#fatload usb 0 0x30008000 zimage.img reading zimage.img . ........................................................................................................................................................... . 1600504 bytes read [Tekkaman2440]#bootm ## Booting image at 30008000 ... Image Name: tekkamanninja Created: 2008-02-18 8:32:06 UTC Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 1600440 Bytes = 1.5 MB Load Address: 30008000 Entry Point: 30008040 Verifying Checksum ... OK XIP Kernel Image ... OK Starting kernel ... Uncompressing Linux........................................................................................................ done, booting the kernel. Linux version 2.6.24 (tekkamanninja@Tekkaman-Ninja) (gcc version 4.1.1) #2 Mon Feb 18 14:35:35 CST 2008 CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177 Machine: Tekkaman2440 Memory policy: ECC disabled, Data cache writeback /*（以下略）*/