[U-Boot-Users] Au1550 U-boot debugging - a newbie question

[RadekFisera <jungelist@centrum.cz>]

I'm using U-boot 1.3.0. The hardware breakpoint option is set in BDI2000
configuration file in target part (initial memory controller registers
settings is also in this file)
[TARGET]
JTAGCLOCK   0      		;use 16 MHz JTAG clock
CPUTYPE     AU1000	        ;AU1000  ;the used target CPU type
ENDIAN      LITTLE              ;target is little endian
STARTUP     RESET
RESET       JTAG		;the reset type (NONE, JTAG, HARD)
BDIMODE     AGENT   	        ;the BDI working mode (LOADONLY | AGENT)
BREAKMODE   HARD          	;SOFT or HARD, HARD uses PPC hardware breakpoints
STEPMODE    JTAG                ;JTAG, HWBP or SWBP
VECTOR      CATCH               ;catch unhandled exceptions

I know that during debugging program in flash only HW breakpoints are
enabled. I tried to set breakpoint in gdb via command "break" and "hbreak"
also. In both case I have observeeed the same behaviour (SIGABRT after stepi
and "*** TARGET: all hardware breakpoints in use " in the telnet session
window). I've tried HWBP option instead of JTAG when chosing the stepmode
for BDI 2000.
 

Shinya Kuribayashi-2 wrote:
> 
> RadekFisera wrote:
>> When I program the bin file to the flash (at 0xbfc00000) and run from
>> this
>> address the bootloader always hangs at 0xbfc0054c (romExcHandle in
>> start.S).
>> I can debug the code via BDI2000 and therefore I see that the code fails
>> at
>> the begining of board_init_f function where the rellocation to RAM is
>> performed.
> 
> It seems relocated data corrupted. What version of U-Boot do you use?
> This relocation problem was an outstanding bug, but fixed in 1.3.0.
> Please try >1.3.0. Quick workarounds also available. See ML archives.
> 
>> I have some troubles also with remote debugging via gdb. I always receive
>> the SIGABRT when the debug pointer reaches the first instruction in
>> start.S.
>> 
>> # ${CROSS_COMPILE}gdb /var/tmp/builds/u-boot
>> GNU gdb Red Hat Linux (6.3.0.0-1.21_3rh)
>> Copyright 2004 Free Software Foundation, Inc.
>> GDB is free software, covered by the GNU General Public License, and you
>> are
>> welcome to change it and/or distribute copies of it under certain
>> conditions.
>> Type "show copying" to see the conditions.
>> There is absolutely no warranty for GDB.  Type "show warranty" for
>> details.
>> This GDB was configured as "--host=i386-redhat-linux
>> --target=mips-linux".
>> The target architecture is set automatically (currently mips)
>> ..
>> (gdb) set endian little
>> The target is assumed to be little endian
>> (gdb) target remote bdi2000:2001
>> Remote debugging using bdi2000:2001
>> _start () at start.S:41
>> 41              RVECENT(reset,0)        /* U-boot entry point */
>> Current language:  auto; currently asm
>> (gdb) stepi
>> 
>> Program received signal SIGABRT, Aborted.
>> reset () at start.S:211
>> 211             mtc0    zero, CP0_WATCHLO
>> 
>> I can set breakpoint however it is not reached although it is set in the
>> code before the function board_init_f. I can see the message on the
>> BDI2000
>> telnet session window: 
>> *** TARGET: all hardware breakpoints in use
>> I tried to clear all breakpoints after each program stop but it didn't
>> help. 
> 
> I'm not familiar with gdb very much, but it seems gdb could not re-
> write ROM. This indicates gdb was going to use software breakpoint.
> Please note what you/we are going to debug, is ROM code, not RAM.
> Please use hardware breakpoint, instead.
> 
> 
>   Shinya
> 
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