Building the root filesystem of Linux 20160611

Let's talk about the construction of the LINUX root file system:

Making a file system

1. cross-compiling busybox

Install: Makeinstall config_prefix=/work/nfs_root/fs_mini_mdev_new

2. Installation Library

Mkdir/work/nfs_root/fs_mini_mdev_new/lib

Mkdir/work/nfs_root/fs_mini_mdev_new/usr/lib-p

cp/usr/local/arm/4.3.2/arm-none-linux-gnueabi/libc/armv4t/lib/*so*/work/nfs_root/fs_mini_mdev_new/lib-d

cp/usr/local/arm/4.3.2/arm-none-linux-gnueabi/libc/armv4t/usr/lib/*so*/work/nfs_root/fs_mini_mdev_new/usr/lib- D

3. build etc directory

4. build the dev directory

5. Other Empty directories

Mkfs.jffs2-n-S 2048-e 128kib-d fs_mini_mdev_new-o FS_MINI_MDEV_NEW.JFFS2

Burn write:

NFS 30000000 192.168.1.123:/WORK/NFS_ROOT/FS_MINI_MDEV_NEW.JFFS2

NAND Erase.part Rootfs

NAND WRITE.JFFS2 30000000 260000 $filesize

Set Bootargs console=ttysac0,115200 root=/dev/mtdblock3 ROOTFSTYPE=JFFS2

NFS 32000000 192.168.1.123:/work/nfs_root/uimage_new

Bootm 32000000

Sigill Illegal Instruction

6. reconfigure kernel support EABI

Set Bootargs console=ttysac0,115200 root=/dev/mtdblock3 ROOTFSTYPE=JFFS2

NFS 32000000 192.168.1.123:/work/nfs_root/uimage_eabi

Bootm 32000000

Three . porting yaffs File System

1. access to source code

git clone git://www.aleph1.co.uk/yaffs2

2. Patching

CD Yaffs-dir

./patch-ker.sh C M Linux-tree such as ./patch-ker.sh C m/work/system/linux-3.4.2

3. Configuring kernel support yaffs

4. compiling and using uimage

5. make, burn and write yaffs Images

Mkyaffs2image fs_mini_mdev_new FS_MINI_MDEV_NEW.YAFFS2

Uboot

NFS 30000000 192.168.1.123:/WORK/NFS_ROOT/FS_MINI_MDEV_NEW.YAFFS2

NAND Erase.part Rootfs

NAND write.yaffs 30000000 260000 $filesize

6. Start

Set Bootargs console=ttysac0,115200 Root=/dev/mtdblock3

NFS 32000000 192.168.1.123:/work/nfs_root/uimage_yaffs

Bootm 32000000

7. unsuccessful, use alternative method to find the problem

7.1 UBOOT may have a problem: change to 1.1.6 UBOOT

TFTP 30000000 U-boot.bin

NAND Erase.part U-boot

NAND write 30000000 U-boot

Reset

NFS 30000000 192.168.1.123:/WORK/NFS_ROOT/FS_MINI_MDEV_NEW.YAFFS2

NAND Erase Rootfs

NAND write.yaffs 30000000 260000 $ (filesize)

Set Bootargs console=ttysac0,115200 Root=/dev/mtdblock3

NFS 32000000 192.168.1.123:/work/nfs_root/uimage_yaffs

Bootm 32000000

Found 1.1.6 UBOOT No problem, so is our transplant new UBOOT has a BUG:

Drivers\mtd\nand\nand_util.c

if (!need_skip &&!) ( Flags & With_drop_ffs)) {

Switch

if (!need_skip &&!) ( Flags & with_drop_ffs) &&! (Flags & With_yaffs_oob)) {

There may be a problem with 7.2 yaffs image

Made the u-boot_new.bin, uimage_new, Fs_mini_mdev_new.yaffs

To re-burn the entire system:

Burn u-boot_new.bin with the jtag tool

or use uboot to update yourself : TFTP 30000000 u-boot_new.bin; NAND erase.part u-boot; NAND write 30000000 U-boot

Start uboot, use it to burn the kernel,FS

TFTP 30000000 uimage_new; NAND Erase.part kernel; NAND write 30000000 kernel

TFTP 30000000 FS_MINI_MDEV_NEW.YAFFS2; NAND Erase.part Rootfs; NAND write.yaffs 30000000 260000 $filesize

Setting parameters

Set ' NAND read 30000000 Kernel;bootm 30000000 '

Set Bootargs console=ttysac0,115200 Root=/dev/mtdblock3

Set Machid 16a

Save

Using Kernel patches:

Patch-p1 <. /linux-3.4.2_100ask.patch

CP config_ok. config

Make Uimage

Accompanying author study notes:

1.busybox installation, complete the second build init program that is busybox itself

2. build other basic three items:

3. Add PS and other commands:

4. join Udev that automatically creates the device node :

5. making file systems in other formats:

6. making the Network file system:

Building the root filesystem of Linux 20160611