[U-Boot] "b reset" does not work in u-boot_v2010.12-rc3 with eldk4.2

[MrGates]

Hi,when i upgrade uboot from 1.1.2 to v2010.12-rc3
i met a great number of problems.
Before, i use skyeye to simulate uboot.
furthermore i use "arm-linux-gdb u-boot"(eldk-4.2) to step by step executes 
u-boot
the result like below:

(gdb) tar remote :12345
Remote debugging using :12345
_start () at start.S:40
40      start.S: No such file or directory.
        in start.S
Current language:  auto; currently asm
(gdb)
(gdb) step
_start () at start.S:41
41      in start.S
(gdb)
_start () at start.S:42
42      in start.S
(gdb)
_start () at start.S:43
43      in start.S
(gdb)
_start () at start.S:44
44      in start.S
(gdb)
_start () at start.S:45
45      in start.S
(gdb)
_start () at start.S:46
46      in start.S
(gdb)
_start () at start.S:47
47      in start.S
(gdb)
reset () at start.S:108
108     in start.S
(gdb)
reset () at start.S:109
109     in start.S
(gdb)
reset () at start.S:110
110     in start.S
(gdb)
reset () at start.S:111
111     in start.S
(gdb)
reset () at start.S:118
118     in start.S
(gdb)
reset () at start.S:124
124     in start.S
(gdb)
call_board_init_f () at start.S:129
129     in start.S
(gdb)
call_board_init_f () at start.S:130
130     in start.S
(gdb)
call_board_init_f () at start.S:131
131     in start.S
(gdb)
call_board_init_f () at start.S:132
132     in start.S
(gdb)

These indicate that in start.S,first instruction:b reset not jump success
The process just go from one instruction to the next.
What may be the problem?any suggestions is appreciate.
MrGates