Hello everybody,
I'm trying to work with orpsoc branch from
http://git.openrisc.net/cgit.cgi/stefan/orpsoc. The issue that i
encountered is associated with target debugging through gdb. FPGA project
configuration is exactly the same as in repository (fresh git clone) so
with adv_debug_sys, altera virtual jtag and onboard usb blaster. When I'm
running adv debug bridge i can download the software and run it
successfully (done simple bare metal gpio test program written in C). But
when i try to stop the target (control^C) i get error in gdb like this:
(gdb) target remote :9999
Remote debugging using :9999
0xf00001a0 in ?? ()
(gdb) load
Loading section .vectors, size 0x2000 lma 0x0
Loading section .init, size 0x28 lma 0x2000
Loading section .text, size 0xe7d8 lma 0x2028
Loading section .fini, size 0x1c lma 0x10800
Loading section .rodata, size 0x66c lma 0x1081c
Loading section .eh_frame, size 0x4 lma 0x10e88
Loading section .ctors, size 0xc lma 0x12e8c
Loading section .dtors, size 0x8 lma 0x12e98
Loading section .jcr, size 0x4 lma 0x12ea0
Loading section .data, size 0xa04 lma 0x12ea4
Start address 0x2028, load size 71848
Transfer rate: 11 KB/sec, 5526 bytes/write.
(gdb) br main
Breakpoint 1 at 0x2420: file ../main.c, line 57.
(gdb) c
Continuing.
*Remote failure reply: E01*
(gdb) info line
*Remote failure reply: E01*
(gdb)
from adv debug bridge i get:
'usb_blaster' interface using libftdi
current latency timer: 2
Enumerating JTAG chain...
Devices on JTAG chain:
Index Name ID Code IR Length
----------------------------------------------------------------
0: VIRTUAL_TAP 0x020F30DD 10
Target device 0, JTAG ID = 0x020f30dd
JSP server listening on host rozpruwacz (0.0.0.0), port 9944, address
family IPv4
JSP server thread running!
No watchpoint hardware found, HWP server not starting
JTAG bridge ready!
CRC ERROR! Computed 0x468e4ec0, read CRC 0x25e00e85
Retry count exceeded! Abort!
Error while reading all registers: 'CRC mismatch'
CRC ERROR! Computed 0x468e4ec0, read CRC 0x25e00e85
Retry count exceeded! Abort!
Error while reading all registers: 'CRC mismatch'
With OpenOCD is much better, i can set breakpoints, run, stop, view
variables but the problem is with single-stepping. It seems that branch
instructions won't single-step. when i execute "step" command in gdb while
being on function invocation gdb stops on line after function invocation,
not inside the function, without executing the function. Example:
(gdb) c
Continuing.
[Remote target] #1 stopped.
main () at ../main.c:65
65 set_gpio(pin);
(gdb) l
60
61 printf("Hello World !!!\n\r");
62
63 for (;;) {
64
65 set_gpio(pin);
66
67 printf("pin state: %02x\n\r", gpio_state);
68
69 msleep(200);
(gdb) s
67 printf("pin state: %02x\n\r", gpio_state);
(gdb)
I'm using trunk version of adv debug bridge from opencores.org svn and
OpenOCD from http://git.openrisc.net/cgit.cgi/julius/openocd/
adv_debug_sys<http://git.openrisc.net/cgit.cgi/julius/openocd/log/?h=adv_debug_sys>
branch
Cheers,
Marek
--
mgr inż. Marek Czerski
+48 696 842 686
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