Re: debugging an Atmel EB40 with a Jeeni

[Fernando Nasser <fnasser at cygnus dot com>]

Shaun Jackman wrote:
> 
> I have an Atmel EB40. I'm using GDB and a Jeeni to debug it.
> When I set the ARM CPSR register, I get a data abort.
> This shouldn't touch data at all. What's happening?
> This GDB was configured as "--host=i586-pc-linux-gnu --target=arm-elf"...
> (gdb) target rdi e=jeeni
> JEENI (ADP, ARM7TDI) Rev 2.0
> Rebuilt on Oct 18 1999 at 18:31:13
> SN=0009J002 ENET=00:80:CF:00:09:E4
> IP=192.168.2.2
> Connected to ARM RDI target.
> (gdb) set $cpsr=0x1f
> RDI_read: data abort, no memory at specified address?
> RDI_read: data abort, no memory at specified address?
> Cannot access memory at address 0x852b5a7c
> (gdb)
> The address (0x852b5a7c) is way out in lala land and if
> anything tried to access it it would definately cause a data abort.
> 
> Also, a really strange issue with a block memory clear hanging.
> This GDB was configured as "--host=i586-pc-linux-gnu --target=arm-elf"...
> (gdb) target rdi e=jeeni
> JEENI (ADP, ARM7TDI) Rev 2.0
> Rebuilt on Oct 18 1999 at 18:31:13
> SN=0009J002 ENET=00:80:CF:00:09:E4
> IP=192.168.2.2
> Connected to ARM RDI target.
> (gdb) set *(int*)0xffe00020=1
> (gdb) set *(int*)0xffe00004=0x2002121
> (gdb) set *(char*)0x20005a3 = 0
> (gdb) set *(char*)0x20005a4 = 0
> (gdb) set *(char*)0x20005a5 = 0
> (gdb) set (char[0x5a5])*0x2000000={}
> [hangs here, never hear a word from it again]
> 
> The two writes to 0xffe0xxxx map the sram to 0x2000000.
> All the above writes work just fine, but any block clear larger than 0x5a4 hangs it.
> Any idea what's happening here?
> 

I have no idea, but we can know a little bit more if you turn log on.
Better double check the help, but if I remember well it goes like that:
(gdb) set rdilogfile <yourfile-or-/dev/tty>
(gdb) set rdilogenable true

Maybe you should turn log on after the connection so you don't get too much log.
This should give us a clue.


-- 
Fernando Nasser
Red Hat - Toronto                       E-Mail:  fnasser@cygnus.com
2323 Yonge Street, Suite #300           Tel:  416-482-2661 ext. 311
Toronto, Ontario   M4P 2C9              Fax:  416-482-6299