[U-Boot] U-boot debug<Program received signal SIGSTOP, Stopped (signal).0xfff00134 in boot_warm ()>

[Kelven Huai]

Hi WD,

Now we're debugging Microsys PM520 U-boot-1.2.0, and facing a huge problem, we can NOT debug the u-boot via BDI2000.

The below are our u-boot debugging procedures for your reference. Microsys PM520 (we used 2pcs Intel 28F128J3)

BDI2000
-       Telnet BDI
-       reset
-       Unlock 0xfff00000 1000

GDB
-       ppc-linux-gdb u-boot
-       target remote bdi:2001
-       (gdb) stepi


It looks like the "Program received signal SIGSTOP, Stopped (signal)." stopped in "bl   fff03178 <init_5xxx_core>".

And "x/i $pc" reading was very unstable, so could you please give me some ideas about this point?

gdb
--------------------------------------------------------------------------------------------
0xfff00100 in _start ()
(gdb) stepi
0xfff00104 in _start ()
(gdb)
0xfff00108 in _start ()
(gdb)
0xfff00118 in boot_warm ()
(gdb)
0xfff0011c in boot_warm ()
(gdb)
0xfff00120 in boot_warm ()
(gdb)
0xfff00124 in boot_warm ()
(gdb)
0xfff00128 in boot_warm ()
(gdb)
0xfff0012c in boot_warm ()
(gdb)
0xfff00130 in boot_warm ()
(gdb)


Program received signal SIGSTOP, Stopped (signal).
0xfff00134 in boot_warm ()
(gdb)
(gdb) x/i $pc
0xfff00134 <boot_warm+28>:      bl      0xfff03178 <init_5xxx_core>
(gdb) x/i $pc
0xfff00134 <boot_warm+28>:      .long 0x0
(gdb) x/i $pc
0xfff00134 <boot_warm+28>:      .long 0x0
(gdb) x/i $pc
0xfff00134 <boot_warm+28>:      .long 0x0
(gdb)
-----------------------------------------------------------------------------------------------

u-boot.s
-----------------------------------------------------------------------------------------------
fff00118 <boot_cold>:
fff00118:       7c a0 00 a6     mfmsr   r5
fff0011c:       3c 60 f0 00     lis     r3,-4096
fff00120:       60 63 00 00     ori     r3,r3,0
fff00124:       7c 77 4b a6     mtspr   311,r3
fff00128:       54 63 84 3e     rlwinm  r3,r3,16,16,31
fff0012c:       3c 80 80 00     lis     r4,-32768
fff00130:       90 64 00 00     stw     r3,0(r4)
fff00134:       48 00 30 45     bl      fff03178 <init_5xxx_core>
-----------------------------------------------------------------------------------------------

Thanks
Kelven