Linux_for_yaffs.rar_Linux日志_yaffs

Linux+yaffs文件系统移植 一.linux 2.6内核的移植 1)从http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.14.1.tar.bz2 下载linux-2.6.14.1内核至/usr/src/ [root@localhost src]#tar xzvf linux-2.6.14.1.tar.gz [root@localhost src]# cd linux-2.6.14 2)修改Makefile 修改内核目录树根下的的Makefile,指明交叉编译器 [root@localhost linux-2.6.14]# vi Makefile 找到ARCH和CROSS_COMPILE，修改 ARCH = arm CROSS_COMPILE = arm-linux- [arm@localhost linux-2.6.14]# export PATH=/usr/local/arm/3.4.4/bin:$PATH (假设你的交叉编译工具在/usr/local/arm/3.4.4/bin下) 3)修改内核 在arch/arm/mach-s3c2410/devs.c文件中: [root@localhost linux-2.6.14]$ vi arch/arm/mach-s3c2410/devs.c 添加如下内容： #include <linux/mtd/partitions.h> #include <linux/mtd/nand.h> #include <asm/arch/nand.h> ... /* NAND Controller */ 1.建立Nand Flash分区表 /* 一个Nand Flash总共64MB, 按如下大小进行分区 */ static struct mtd_partition partition_info[] ={ { name: "vivi", size: 0x00020000, offset: 0x00000000, },{ name: "param", size: 0x00010000, offset: 0x00020000, }, { name: "kernel", size: 0x00100000, offset: 0x00030000, }, { /* 20MB */ name: "root", size: 0x03ec0000, offset: 0x00130000, }, }; name: 代表分区名字 size: 代表flash分区大小(单位：字节) offset: 代表flash分区的起始地址(相对于0x0的偏移) 2. 加入Nand Flash分区 struct s3c2410_nand_set nandset ={ nr_partitions: 4, /* the number of partitions */ partitions: partition_info, /* partition table */ }; nr_partitions: 指明partition_info中定义的分区数目 partitions: 分区信息表 3. 建立Nand Flash芯片支持 struct s3c2410_platform_nand superlpplatform={ tacls:0, twrph0:30, twrph1:0, sets: &nandset, nr_sets: 1, }; tacls, twrph0, twrph1的意思见S3C2410手册的6-3, 这3个值最后会被设置到NFCONF中,见S3C2410手册6-6. sets: 支持的分区集 nr_set:分区集的个数 4. 加入Nand Flash芯片支持到Nand Flash驱动 另外，还要修改此文件中的s3c_device_nand结构体变量,添加对dev成员的赋值 struct platform_device s3c_device_nand = { .name = "s3c2410-nand", /* Device name */ .id = -1, /* Device ID */ .num_resources = ARRAY_SIZE(s3c_nand_resource), .resource = s3c_nand_resource, /* Nand Flash Controller Registers */ /* Add the Nand Flash device */ .dev = { .platform_data = &superlpplatform }, }; name: 设备名称 id: 有效设备编号,如果只有唯一的一个设备为-1, 有多个设备从0开始计数. num_resource: 有几个寄存器区 resource: 寄存器区数组首地址 dev: 支持的Nand Flash设备 修改arch/arm/mach-s3c2410/mach-smdk2410.c文件 [root@localhost linux-2.6.14]$ vi arch/arm/mach-s3c2410/mach-smdk2410.c 修改smdk2410_devices[].指明初始化时包括我们在前面所设置的flash分区信息 static struct platform_device *smdk2410_devices[] __initdata = { &s3c_device_usb, &s3c_device_lcd, &s3c_device_wdt, &s3c_device_i2c, &s3c_device_iis, (93行) /* 添加如下语句即可 */ &s3c_device_nand, }; 保存,退出。 修改drivers/mtd/nand/s3c2410.c 文件: [root@localhost linux-2.6.14]$ vi drivers/mtd/nand/s3c2410.c 找到s3c2410_nand_init_chip()函数(509行)，在该函数体最后加上一条语句: chip->eccmode = NAND_ECC_NONE; 保存,退出。 为了我们的内核支持devfs以及在启动时并在/sbin/init运行之前能自动挂载/dev为devfs文件系统，修改 fs/Kconfig文件 [root@localhost linux-2.6.14]$ vi fs/Kconfig 找到menu "Pseudo filesystems" (734行) 添加如下语句： config DEVFS_FS bool "/dev file system support (OBSOLETE)" default y config DEVFS_MOUNT bool "Automatically mount at boot" default y depends on DEVFS_FS 为了使我们的内核支持yaffs及yaffs2文件系统，从http://www.aleph1.co.uk/cgi-bin/viewcvs.cgi/yaffs2.tar.gz?view=tar下载yaffs2.tar.gz，并解压到/tmp。 [root@localhost tmp]# cd yaffs2 [root@localhost yaffs2]# sh patch-ker.sh /usr/src/linux-2.6.14 执行完后，我们的yaffs2已经加入到了内核。 4)配置内核产生.config文件 [root@localhost linux-2.6.14]$ make smdk2410_defconfig [root@localhost linux-2.6.14]$ make menuconfig 在smdk2410_defconfig基础上，我所增删的内核配置项如下： Loadable module support ---> [*] Enable loadable module support [*] Automatic kernel module loading System Type ---> [*] S3C2410 DMA support Boot options ---> Default kernel command string: noinitrd root=/dev/mtdblock/3 init=/linuxrc console=ttySAC0,115200 #说明：mtdblock/3代表我的第4个root分区，它是我的rootfs # console=ttySAC0,115200使kernel启动期间的信息全部输出到串口0上. # 2.6内核对于串口的命名改为ttySAC0. Floating point emulation ---> [*] NWFPE math emulation This is necessary to run most binaries!!! #接下来要做的是对内核MTD子系统的设置 Device Drivers ---> Memory Technology Devices (MTD) ---> [*] MTD partitioning support #支持MTD分区，这样我们在前面设置的分区才有意义 [*] Command line partition table parsing #支持从命令行设置flash分区信息，灵活 [*] Direct char device access to MTD devices [*] Caching block device access to MTD devices RAM/ROM/Flash chip drivers ---> <*> Detect flash chips by Common Flash Interface (CFI) probe <*> Detect non-CFI AMD/JEDEC-compatible flash chips <*> Support for Intel/Sharp flash chips <*> Support for AMD/Fujitsu flash chips <*> Support for ROM chips in bus mapping NAND Flash Device Drivers ---> <*> NAND Device Support <*> NAND Flash support for S3C2410/S3C2440 SoC Character devices ---> [*] Non-standard serial port support [*] S3C2410 RTC Driver File systems ---> <> Second extended fs support #去除对ext2的支持 Pseudo filesystems ---> [*] /proc file system support [*] Virtual memory file system support (former shm fs) [*] /dev file system support (OBSOLETE) [*] Automatically mount at boot (NEW) Miscellaneous filesystems ---> [*] YAFFS2 file system support 512 byte / page devices [*] Lets Yaffs do its own ECC [*] Use the same ecc byte order as Steven Hill's nand_ecc.c --- 2048 byte (or larger) / page devices [*] Autoselect yaffs2 format [*] Disable lazy loading [*] Turn off wide tnodes [*] Turn off debug chunk erase check [*] Cache short names in RAM Network File Systems ---> <*> NFS file system support 保存退出，产生.config文件. 5)编译内核 [root@localhost linux-2.6.14]$ make 注意：若编译内核出现如下情况 LD .tmp_vmlinux1 arm-linux-ld:arch/arm/kernel/vmlinux.lds:1439: parse error make: *** [.tmp_vmlinux1] Error 1 解决方法：修改arch/arm/kernel/vmlinux.lds [root@localhost linux-2.6.14]$ vi arch/arm/kernel/vmlinux.lds 将文件尾2条的ASSERT注释掉（1439行） /* ASSERT((__proc_info_end - __proc_info_begin), "missing CPU support") */ /* ASSERT((__arch_info_end - __arch_info_begin), "no machine record defined") */ 然后重新make即可 成功后在arch/arm/boot/下产生zImage �