PythonQ 248-8XX Especificaciones Pagina 69
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testnode {
};
=>
5.9.7.5. fdt set - set node properties
Now, let's create a property at the newly created node; again we'll use fdt list for verification:
=> fdt set /testnode testprop testvalue
=> fdt list /testnode
testnode {
testprop = "testvalue";
};
=>
5.9.7.6. fdt rm - remove nodes or properties
The fdt rm command is used to remove nodes and properties. Let's delete the test property created in the
previous paragraph and verify the results:
=> fdt rm /testnode testprop
=> fdt list /testnode
testnode {
};
=> fdt rm /testnode
=> fdt list /
/ {
#address-cells = <0x1>;
#size-cells = <0x1>;
interrupt-parent = <0x1>;
model = "DENX M28EVK";
compatible = "denx,m28evk", "fsl,imx28";
chosen {
};
aliases {
};
memory {
};
cpus {
};
apb@80000000 {
};
ahb@80080000 {
};
regulators {
};
sound {
};
};
=>
5.9.7.7. fdt move - move FDT blob to new address
To move the blob from one memory location to another we will use the fdt move command. Besides
moving the blob, it makes the new address the "active" one - similar to fdt addr:
=> fdt move ${fdt_addr_r} 0x42000000
=> fdt list /
/ {
#address-cells = <0x1>;
#size-cells = <0x1>;
5.9.7.4. fdt mknode - create new nodes 69
- 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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