制作SD卡启动文件系统

【1】对SD卡分区

按飞思卡尔文档列出的分区表用fdisk分区:

Partition Type/Index	Name	Start Offset	Size	File System	Content
N/A	BOOT	0	10MB	N/A	bootloader/kernel/uramdisk images
Primary 1	MEDIA	10MB	User Defined	VFAT. Mount as /sdcards	Media file storage
Primary 2	SYSTEM	follow MEDIA	>= 200MB	EXT4. Mount as /system (with read only)	Android system bin/libs (system.img)
Logic 5 (Extended 3)	DATA	follow SYSTEM	> 200MB	EXT4. Mount as /data	Android data (e.g. installed app)
Logic 6 (Extended 3)	CACHE	follow DATA	> 10MB	EXT4. Mount as /cache	Android cache
Primary 4	RECOVERY	follow CACHE	> 20MB	EXT4. Mount as / in recovery mode	Root file system for recovery mode (recovery.img)

To create these partitions, you can simply use MFG tool described in next section, or use fdisk utility on Linux PC.

After creating the partitions by fdisk, please format each file systems by the following commands:

hui@ubuntu:~$ sudo fdisk /dev/sdb

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

switch off the mode (command 'c') and change display units to

sectors (command 'u').

#先查看分区

Command (m for help): p

#显示有一个分区sdb1

Device Boot Start End Blocks Id System

/dev/sdb1 1 1937 15554048 c W95 FAT32 (LBA)

#删除分区

Command (m for help): d

Selected partition 1

Command (m for help): p #查看分区

.....

Device Boot Start End Blocks Id System

#可见,已经无分区存在

#开始分区

Command (m for help): n

Command action

e extended

p primary partition (1-4)

p #选择主分区

Partition number (1-4): 1 #分第一个分区

First cylinder (1-1936, default 1): +10M #预留10兆空间

Last cylinder, +cylinders or +size{K,M,G} (1-1936, default 1936): +14000M #主分区1占14000兆空间

#分第二个主分区

Command (m for help): n

Command action

e extended

p primary partition (1-4)

p #选择p分主分区

Partition number (1-4): 2 #分区2

First cylinder (1787-1936, default 1787):

Using default value 1787

Last cylinder, +cylinders or +size{K,M,G} (1787-1936, default 1936): +200M #主分区2占200兆空间

#分第三个分区

Command (m for help): n

Command action

e extended

p primary partition (1-4)

e #选择e分扩展分区

Partition number (1-4): 3 #分区3

First cylinder (1813-1936, default 1813):

Using default value 1813

Last cylinder, +cylinders or +size{K,M,G} (1813-1936, default 1936): +320M #分配320兆空间

#分第四个分区(主分区)

Command (m for help): n

Command action

l logical (5 or over)

p primary partition (1-4)

p #主分区类型

Selected partition 4

First cylinder (1855-1936, default 1855):

Using default value 1855

Last cylinder, +cylinders or +size{K,M,G} (1855-1936, default 1936):

Using default value 1936

#分第五个分区(扩展分区)

Command (m for help): n

First cylinder (1813-1854, default 1813):

Using default value 1813

Last cylinder, +cylinders or +size{K,M,G} (1813-1854, default 1854): +300M

#分第六个分区(扩展分区)

Command (m for help): n

First cylinder (1852-1854, default 1852):

Using default value 1852

Last cylinder, +cylinders or +size{K,M,G} (1852-1854, default 1854):

Using default value 1854

Command (m for help): p #查看分区

Disk /dev/sdb: 15.9 GB, 15931539456 bytes

255 heads, 63 sectors/track, 1936 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

Device Boot Start End Blocks Id System

/dev/sdb1 1 1786 14346013+ 83 Linux

/dev/sdb2 1787 1812 208845 83 Linux

/dev/sdb3 1813 1854 337365 5 Extended

/dev/sdb4 1855 1936 658665 83 Linux

/dev/sdb5 1813 1851 313236 83 Linux

/dev/sdb6 1852 1854 24066 83 Linux

Command (m for help): w #保存分区信息,退出

The partition table has been altered!

【2】分区完成后,下一步格式化:

[c-sharp] view plain copy

sudo mkfs.vfat /dev/sdb1
sudo mkfs.ext4 /dev/sdb2 -O ^extent -L system
sudo mkfs.ext4 /dev/sdb4 -O ^extent -L recovery
sudo mkfs.ext4 /dev/sdb5 -O ^extent -L data
sudo mkfs.ext4 /dev/sdb6 -O ^extent -L cache

【3】把uboot,kernel,ramdisk,system文件同步到SD卡里:

[c-sharp] view plain copy

sudo dd if=u-boot.bin of=/dev/sdb bs=1K skip=1 seek=1; sync
sudo dd if=uImage of=/dev/sdb bs=1M seek=1; sync
sudo dd if=uramdisk.img of=/dev/sdb bs=1M seek=6; sync
sudo dd if=system.img of=/dev/sdb2; sync
sudo dd if=recovery.img of=/dev/sdb4; sync

vi /usr/startx

#!/bin/sh

IS_BABBAGE=NO
grep Babbage /proc/cpuinfo > /dev/null 2>&1
if [ $? = 0 ]; then
IS_BABBAGE=YES
Xfbdev -keybd keyboard,,device=/dev/input/keyboard0 -mouse mouse,2,device=/dev/input/mice &
else
Xfbdev -mouse tslib,2,device=/dev/input/ts0 &
fi
sleep 5
# Calibrate when using the rootfs the first time
if [ $IS_BABBAGE = NO ]; then
ls /usr/etc | grep pointercal > /dev/null 2>&1
if [ $? = 1 ]; then
ts_calibrate
fi
fi

sleep 8

matchbox-window-manager -d :0 -use_lowlight no -use_titlebar yes -use_cursor yes&
matchbox-desktop&

matchbox-panel --bgtrans yes &

uboot 启动参数

setenv bootargs_mmc 'setenv bootargs ${bootargs} console=ttymxc0 root=/dev/mmcblk0p1 rootwait rw video=mxcdi0fb:800x480M-16@60,CLAA-WVGA di0_primary calibration ip=dhcp gpu_nommu gpu_memory=64M'

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