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1 A Simple Guide to Configure KGDB
2
3 Sonic Zhang <sonic.zhang@analog.com>
4 Aug. 24th 2006
5
6
7This KGDB patch enables the kernel developer to do source level debugging on
8the kernel for the Blackfin architecture. The debugging works over either the
9ethernet interface or one of the uarts. Both software breakpoints and
10hardware breakpoints are supported in this version.
11http://docs.blackfin.uclinux.org/doku.php?id=kgdb
12
13
142 known issues:
151. This bug:
16 http://blackfin.uclinux.org/tracker/index.php?func=detail&aid=544&group_id=18&atid=145
17 The GDB client for Blackfin uClinux causes incorrect values of local
18 variables to be displayed when the user breaks the running of kernel in GDB.
192. Because of a hardware bug in Blackfin 533 v1.0.3:
20 05000067 - Watchpoints (Hardware Breakpoints) are not supported
21 Hardware breakpoints cannot be set properly.
22
23
24Debug over Ethernet:
25
261. Compile and install the cross platform version of gdb for blackfin, which
27 can be found at $(BINROOT)/bfin-elf-gdb.
28
292. Apply this patch to the 2.6.x kernel. Select the menuconfig option under
30 "Kernel hacking" -> "Kernel debugging" -> "KGDB: kernel debug with remote gdb".
31 With this selected, option "Full Symbolic/Source Debugging support" and
32 "Compile the kernel with frame pointers" are also selected.
33
343. Select option "KGDB: connect over (Ethernet)". Add "kgdboe=@target-IP/,@host-IP/" to
35 the option "Compiled-in Kernel Boot Parameter" under "Kernel hacking".
36
374. Connect minicom to the serial port and boot the kernel image.
38
395. Configure the IP "/> ifconfig eth0 target-IP"
40
416. Start GDB client "bfin-elf-gdb vmlinux".
42
437. Connect to the target "(gdb) target remote udp:target-IP:6443".
44
458. Set software breakpoint "(gdb) break sys_open".
46
479. Continue "(gdb) c".
48
4910. Run ls in the target console "/> ls".
50
5111. Breakpoint hits. "Breakpoint 1: sys_open(..."
52
5312. Display local variables and function paramters.
54 (*) This operation gives wrong results, see known issue 1.
55
5613. Single stepping "(gdb) si".
57
5814. Remove breakpoint 1. "(gdb) del 1"
59
6015. Set hardware breakpoint "(gdb) hbreak sys_open".
61
6216. Continue "(gdb) c".
63
6417. Run ls in the target console "/> ls".
65
6618. Hardware breakpoint hits. "Breakpoint 1: sys_open(...".
67 (*) This hardware breakpoint will not be hit, see known issue 2.
68
6919. Continue "(gdb) c".
70
7120. Interrupt the target in GDB "Ctrl+C".
72
7321. Detach from the target "(gdb) detach".
74
7522. Exit GDB "(gdb) quit".
76
77
78Debug over the UART:
79
801. Compile and install the cross platform version of gdb for blackfin, which
81 can be found at $(BINROOT)/bfin-elf-gdb.
82
832. Apply this patch to the 2.6.x kernel. Select the menuconfig option under
84 "Kernel hacking" -> "Kernel debugging" -> "KGDB: kernel debug with remote gdb".
85 With this selected, option "Full Symbolic/Source Debugging support" and
86 "Compile the kernel with frame pointers" are also selected.
87
883. Select option "KGDB: connect over (UART)". Set "KGDB: UART port number" to be
89 a different one from the console. Don't forget to change the mode of
90 blackfin serial driver to PIO. Otherwise kgdb works incorrectly on UART.
91
924. If you want connect to kgdb when the kernel boots, enable
93 "KGDB: Wait for gdb connection early"
94
955. Compile kernel.
96
976. Connect minicom to the serial port of the console and boot the kernel image.
98
997. Start GDB client "bfin-elf-gdb vmlinux".
100
1018. Set the baud rate in GDB "(gdb) set remotebaud 57600".
102
1039. Connect to the target on the second serial port "(gdb) target remote /dev/ttyS1".
104
10510. Set software breakpoint "(gdb) break sys_open".
106
10711. Continue "(gdb) c".
108
10912. Run ls in the target console "/> ls".
110
11113. A breakpoint is hit. "Breakpoint 1: sys_open(..."
112
11314. All other operations are the same as that in KGDB over Ethernet.
114
115
116Debug over the same UART as console:
117
1181. Compile and install the cross platform version of gdb for blackfin, which
119 can be found at $(BINROOT)/bfin-elf-gdb.
120
1212. Apply this patch to the 2.6.x kernel. Select the menuconfig option under
122 "Kernel hacking" -> "Kernel debugging" -> "KGDB: kernel debug with remote gdb".
123 With this selected, option "Full Symbolic/Source Debugging support" and
124 "Compile the kernel with frame pointers" are also selected.
125
1263. Select option "KGDB: connect over UART". Set "KGDB: UART port number" to console.
127 Don't forget to change the mode of blackfin serial driver to PIO.
128 Otherwise kgdb works incorrectly on UART.
129
1304. If you want connect to kgdb when the kernel boots, enable
131 "KGDB: Wait for gdb connection early"
132
1335. Connect minicom to the serial port and boot the kernel image.
134
1356. (Optional) Ask target to wait for gdb connection by entering Ctrl+A. In minicom, you should enter Ctrl+A+A.
136
1377. Start GDB client "bfin-elf-gdb vmlinux".
138
1398. Set the baud rate in GDB "(gdb) set remotebaud 57600".
140
1419. Connect to the target "(gdb) target remote /dev/ttyS0".
142
14310. Set software breakpoint "(gdb) break sys_open".
144
14511. Continue "(gdb) c". Then enter Ctrl+C twice to stop GDB connection.
146
14712. Run ls in the target console "/> ls". Dummy string can be seen on the console.
148
14913. Then connect the gdb to target again. "(gdb) target remote /dev/ttyS0".
150 Now you will find a breakpoint is hit. "Breakpoint 1: sys_open(..."
151
15214. All other operations are the same as that in KGDB over Ethernet. The only
153 difference is that after continue command in GDB, please stop GDB
154 connection by 2 "Ctrl+C"s and connect again after breakpoints are hit or
155 Ctrl+A is entered.