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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@96 a1c6a512-1295-4272-9138-f99709370657

gdb/README

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+--------------------------------------------------------------------
+             __________               __   ___.
+   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+                     \/            \/     \/    \/            \/
+ $Id$
+
+ Copyright (C) 2002 by Linus Nielsen Feltzing
+
+--------------------------------------------------------------------
+
+Debugging the Archos Jukebox
+----------------------------
+
+To debug using the serial port on the Jukebox, you need to do the following:
+
+1) Connect the serial port to the PC. This is best done with the "serial
+   port mod" described on the home page, along with a serial port converter
+   for the 3V signals from the Jukebox.
+
+2) Build or download a GDB SH1 cross debugger
+
+3) Compile the GDB stub from the CVS "gdb" archive
+
+4) Copy the newly built ARCHOS.MOD to the Jukebox.
+
+5) Start the Jukebox and fire up the GDB with the elf file you want to debug
+   as an argument along with the baud rate:
+
+   # sh-elf-gdb -b 38400 test.elf
+
+6) In GDB, type:
+
+   (gdb) target remote /dev/ttyS0
+   
+   /dev/ttyS0 is the serial port you want to use. I guess Windows users
+   would type COM1 or something like that.
+
+   GDB should answer with a message like:
+
+   Remote debugging using /dev/ttyS0
+   0x090014b6 in ?? ()
+   (gdb)
+
+7) Load the code from the elf file you specified on the command line:
+
+   (gdb) load
+
+   GDB should answer like this:
+
+   Loading section .text, size 0x6b00 lma 0x9018000
+   Loading section .data, size 0x738 lma 0x901eb00
+   Start address 0x9018290, load size 29240
+   Transfer rate: 11696 bits/sec, 102 bytes/write.
+   (gdb)
+
+8) You're set. Now try to set a breakpoint and run:
+
+   (gdb) b 22
+   Breakpoint 1 at 0x90182c6: file led.c, line 14.
+   (gdb) c
+   Continuing.
+
+   Breakpoint 2, main () at led.c:15
+   15       SSR1 &= ~(SCI_RDRF | SCI_ORER | SCI_PER | SCI_FER);
+   (gdb)
+
+   Good luck!
+
+
+Technical details:
+
+   As for now, the GDB stub occupies the memory from 0x900000 up to
+   0x9018000. This will change.
+
+   Compile and link your test program at 0x9018000 and up, and it will work.
+
+   The baud rate is 38400, and the settings are 8N1.