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A modern Music Player Daemon based on Rockbox open source high quality audio player
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1--------------------------------------------------------------------
2 __________ __ ___.
3 Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 \/ \/ \/ \/ \/
8 $Id$
9
10 Copyright (C) 2002 by Linus Nielsen Feltzing
11
12--------------------------------------------------------------------
13
14Debugging the Archos Jukebox
15----------------------------
16
17To debug using the serial port on the Jukebox, you need to do the following:
18
191) Connect the serial port to the PC. This is best done with the "serial
20 port mod" described on the home page, along with a serial port converter
21 for the 3V signals from the Jukebox.
22
232) Build or download a GDB SH1 cross debugger
24
253) Compile the GDB stub from the CVS "gdb" archive
26 For Player models, just type:
27 # make
28
29 For Recorder, type
30 #make RECORDER=1
31
324) Copy the newly built ARCHOS.MOD to the Jukebox.
33
345) Start the Jukebox and fire up the GDB with the elf file you want to debug
35 as an argument along with the baud rate:
36
37 For Player:
38 # sh-elf-gdb -b 38400 test.elf
39
40 For Recorder:
41 # sh-elf-gdb -b 115200 test.elf
42
436) In GDB, type:
44
45 (gdb) target remote /dev/ttyS0
46
47 /dev/ttyS0 is the serial port you want to use. I guess Windows users
48 would type COM1 or something like that.
49
50 GDB should answer with a message like:
51
52 Remote debugging using /dev/ttyS0
53 0x090014b6 in ?? ()
54 (gdb)
55
567) Load the code from the elf file you specified on the command line:
57
58 (gdb) load
59
60 GDB should answer like this:
61
62 Loading section .text, size 0x6b00 lma 0x9018000
63 Loading section .data, size 0x738 lma 0x901eb00
64 Start address 0x9018290, load size 29240
65 Transfer rate: 11696 bits/sec, 102 bytes/write.
66 (gdb)
67
688) You're set. Now try to set a breakpoint and run:
69
70 (gdb) b main
71 Breakpoint 1 at 0x9011b2a: file main.c, line 192.
72 (gdb) c
73 Continuing.
74
75 Breakpoint 1, main () at main.c:192
76 192 app_main();
77 (gdb)
78
79 Good luck!
80
81
82Technical details:
83
84 As for now, the GDB stub occupies the memory from 0x900000 up to
85 0x9018000.
86
87 Compile and link your test program at 0x9018000 and up, and it will work.
88
89 The baud rate is 38400 for Player, 115200 for Recorder, and the settings
90 are 8N1.
91
92 Note that you may have to change the ATA I/O address in the ATA_CONTROL
93 macro in sh-stub.c. go to Menu->Debug (keep out)->View HW info to find out.
94
95 Linus Nielsen Feltzing