PythonQ 248-8XX Spécifications Page 119
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Noté. / 5. Basé sur avis des utilisateurs
$ mkdir rootfs
$ cd rootfs
$ tar -zxf /tmp/rootfs.tar.gz
Like with the cramfs root file system, we use "tmpfs" for cases where a writable file system is
needed and add the following lines to the /etc/rc.sh script:
# mount TMPFS because root-fs is readonly
/bin/mount -t tmpfs -o size=2M tmpfs /tmpfs
We also create the same symbolic links for device files that must be placed in a writable filesystem:
dev/ptyp0 → /tmpfs/dev/ptyp0 dev/ttyp0 → /tmpfs/dev/ttyp0
dev/ptyp1 → /tmpfs/dev/ptyp1 dev/ttyp1 → /tmpfs/dev/ttyp1
dev/ptyp2 → /tmpfs/dev/ptyp2 dev/ttyp2 → /tmpfs/dev/ttyp2
dev/ptyp3 → /tmpfs/dev/ptyp3 dev/ttyp3 → /tmpfs/dev/ttyp3
dev/ptyp4 → /tmpfs/dev/ptyp4 dev/ttyp4 → /tmpfs/dev/ttyp4
dev/ptyp5 → /tmpfs/dev/ptyp5 dev/ttyp5 → /tmpfs/dev/ttyp5
dev/ptyp6 → /tmpfs/dev/ptyp6 dev/ttyp6 → /tmpfs/dev/ttyp6
dev/ptyp7 → /tmpfs/dev/ptyp7 dev/ttyp7 → /tmpfs/dev/ttyp7
dev/ptyp8 → /tmpfs/dev/ptyp8 dev/ttyp8 → /tmpfs/dev/ttyp8
dev/ptyp9 → /tmpfs/dev/ptyp9 dev/ttyp9 → /tmpfs/dev/ttyp9
dev/ptypa → /tmpfs/dev/ptypa dev/ttypa → /tmpfs/dev/ttypa
dev/ptypb → /tmpfs/dev/ptypb dev/ttypb → /tmpfs/dev/ttypb
dev/ptypc → /tmpfs/dev/ptypc dev/ttypc → /tmpfs/dev/ttypc
dev/ptypd → /tmpfs/dev/ptypd dev/ttypd → /tmpfs/dev/ttypd
dev/ptype → /tmpfs/dev/ptype dev/ttype → /tmpfs/dev/ttype
dev/ptypf → /tmpfs/dev/ptypf dev/ttypf → /tmpfs/dev/ttypf
tmp → /tmpfs/tmp var → /tmpfs/var
dev/log → /var/log/log
In case you use dhclient also:
etc/dhclient.conf → /tmpfs/var/lib/dhclient.conf etc/resolv.conf → /tmpfs/var/lib/resolv.conf
To place the corresponding directories and device files in the tmpfs file system, the following code
is added to the /etc/rc.sh script:
mkdir -p /tmpfs/tmp /tmpfs/dev \
/tmpfs/var/lib/dhcp /tmpfs/var/lock /tmpfs/var/run
while read name minor
do
mknod /tmpfs/dev/ptyp$name c 2 $minor
mknod /tmpfs/dev/ttyp$name c 3 $minor
done <<__EOD__
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
a 10
b 11
c 12
2.
9.5.4. Root File System on a Read-Only ext2 File System 119
- 1. Abstract 6
- 2. Introduction 7
- 3.1. ELDK Availability 10
- 3.2. ELDK Getting Help 10
- 3.3. Supported Host Systems 10
- 3.5. Installation 11
- 3.5.1. Product Packaging 11
- 3.5.2. Downloading the ELDK 11
- 3.5.3. Initial Installation 12
- Packages 13
- 3.6. Working with ELDK 14
- $ arm-linux-gcc -c myfile.c 15
- 3.9. ELDK Packages 18
- 3.10.3. build.sh Usage 28
- 4. System Setup 30
- 4.8. Configuring a NFS Server 34
- 5. Das U-Boot 36
- 5.1. Current Versions 36
- 5.3. Configuration 37
- 5.4. Installation 38
- 5.4.1. Before You Begin 38
- 5.5. Tool Installation 39
- 5.6. Initialization 39
- 5.7. Initial Steps 40
- 5.8. The First Power-On 41
- 5.9.1. Information Commands 42
- 5.9.2. Memory Commands 44
- 5.9.2.3. cmp - memory compare 45
- 5.9.2.4. cp - memory copy 46
- 5.9.2.5. md - memory display 46
- 5.9.3. Flash Memory Commands 50
- 5.9.3.6. UBI Usage in U-Boot 54
- Useful definitions: 58
- 5.9.5. Download Commands 61
- 5.9.9. Storage devices 72
- 5.9.9.1. MMC devices 72
- 5.9.8. Special Commands 72
- 5.9.9.1. MMC devices 74 74
- 5.9.9.1. MMC devices 75 75
- 5.9.9.2. NAND devices 76
- 5.13. U-Boot Image Formats 84
- 5.14.1. Boot Count Limit 84
- 6.3. Installation 86
- 7. Booting Embedded Linux 87
- 7.1. Introduction 87
- 7.3. Passing Kernel Arguments 88
- 7.4. Boot Arguments Unleashed 88
- 8. Building and Using Modules 96
- 9. Advanced Topics 97
- 9.1. Flash Filesystems 97
- 9.1.3. Second Version of JFFS 99
- 9.1.5.1. Create Device Files 101
- 9.2.1. Mount Parameters 107
- $ mkfs.jffs2 -U \ 114
- Using FEC ETHERNET device 115
- Load address: 0x100000 115
- => printenv addip 115
- /proc on /proc type proc (rw) 116
- FAT File System 121
- 9.7. Overlay File Systems 126
- What it is good for? 127
- Examples 127
- # insmod mini_fo.o 128
- Performance overhead 128
- Further information 129
- 9.8.1. Mount Parameters 129
- 9.8.2. Example 129
- 10. Debugging 130
- 10.1. Debugging of U-Boot 130
- 10.2. Linux Kernel Debugging 131
- 10.4. Tips and Tricks 135
- 10.5. Application Debugging 135
- 10.5.2. Remote Debugging 136
- 12.1. Application Notes 137
- 12.2. Further Reading 137
- 12.2.2. Linux kernel 138
- Articles 138
- Standards: 139
- 12.2.4. Network Programming 139
- 12.2.10. Embedded Topics 141
- 12.3. Mailing Lists 142
- 12.4. Links 142
- 12.5. Tools 143
- 13. Appendix 143
- 13.1. Flat Device Tree 144 144
- 13.1. Flat Device Tree 145 145
- 13.1. Flat Device Tree 146 146
- ELDK Installation Hangs 151
- 14.1.11. Enable SSH Access 158
- 14.2. U-Boot 159
- -mrelocatable 160
- Compiler 164
- 14.2.12. Erasing Flash Fails 165
- $ make tools/gen_eth_addr 166
- $ tools/gen_eth_addr 166
- 14.2.17.2. Hush shell 169
- 14.2.17.3. Hush shell scripts 170
- 14.2.17.4. General rules 171
- => setenv clocks_in_mhz 1 173
- => saveenv 173
- => setenv clocks_in_mhz 173
- Rebooting in 1 seconds 178
- # cat /etc/blank_off 181
- # cat /etc/init_tty 181
- Multi-File Image 183
- 14.3.26.1. XIP Kernel 191
- 14.3.26.2. Cramfs Filesystem 192
- 14.3.26.3. Hints and Notes 193
- 14.3.30. Swapping over NFS 196
- 14.4. Self 198
- 14.5. RTAI 200
- 14.6. BDI2000 201
- 14.7. Motorola LITE5200 Board 203
- 15. Glossary 204
- YellowDog 210
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