PythonQ 248-8XX Especificaciones Pagina 201
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When I try to compile my LInux kernel after applying the RTAI patch, I get a strange "asm-specifier
for variable `__sc_3' conflicts with asm clobber list" error message. What does that mean?
Answer:
You are using an old version of the Linux kernel / RTAI patch in combination with a more recent
version of the cross compiler. Please use a recent kernel tree (and the corresponding RTAI patch), or
apply the attached patch to fix this problem.
See: http://www.denx.de/wiki/pub/DULG/ConflictsWithAsmClobberList/patch
14.6. BDI2000
14.6.1. Where can I find BDI2000 Configuration
Files?
The configuration files provided by Abatron can be found here: ftp://94.230.212.16/bdigdb/config/
A collection of configuration files for the BDI2000 BDM/JTAG debugger by Abatron can be found at
ftp://ftp.denx.de/pub/BDI2000/
A list of FAQ (with answers) can be found at http://www.ultsol.com/faqs.htm
A list of supported flash chips (and the needed matching entries for the config file) can be found at
http://www.abatron.ch/fileadmin/user_upload/products/pdf/flashsupp.pdf
14.6.2. How to Debug Linux Exceptions
Question:
I am trying to single step into a Linux exception handler. This does not seem to work. Setting a
breakpoint does not work either.
Answer:
The problem is bit complex on a MPC8xx target. Debug mode entry is like an exception and therefore
only safe at locations in the code where an exception does not lead to an unrecoverable state. Another
exception can only be accepted if SRR0 and SRR1 are saved. The MSR[RI] should indicate if
currently an exception is safe. MSR[RI] is cleared automatically at exception entry.
The MPC8xx hardware breakpoints do only trigger if MSR[RI] is set in order to prevent
non-recoverable state.
The problem is that the Linux exception handler does not take all this into account. First priority has
speed, therefore neither SRR0 nor SRR1 are saved immediately. Only after EXCEPTION_PROLOG
this registers are saved. Also Linux does not handle the MSR[RI] bit.
Hint: Use STEPMODE HWBP when debugging Linux. This allows the TLB Miss Exception
handler to update the TLB while you are single stepping.
14.6.2. How to Debug Linux Exceptions 201
- 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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