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.bss and RedBoot problem

Hi all:
   I recently start working on eCos. here is some problem I have
after 2 week's study of eCos. I am working on platform TS7200
(, this platform prebuild eCos redboot.
I have already compiled the libtarget.a with "rom start-up" option.
when I am trying compile a very simple C program with this static
library. ld complains about .bss is not in the region of ram.
here is my mlt_arm_arm9_ts7200_ram.ldi dump:

#include <pkgconf/hal_arm_arm9_ts7200.h> #include <cyg/infra/>

   ram : ORIGIN = 0x00044F88, LENGTH = 0x01F98078
   SECTION_fixed_vectors (ram, 0x44F88, LMA_EQ_VMA)
   SECTION_rom_vectors (ram, 0x50000, LMA_EQ_VMA)
   SECTION_text (ram, ALIGN (0x4), LMA_EQ_VMA)
   SECTION_fini (ram, ALIGN (0x4), LMA_EQ_VMA)
   SECTION_rodata (ram, ALIGN (0x4), LMA_EQ_VMA)
   SECTION_rodata1 (ram, ALIGN (0x4), LMA_EQ_VMA)
   SECTION_fixup (ram, ALIGN (0x4), LMA_EQ_VMA)
   SECTION_gcc_except_table (ram, ALIGN (0x4), LMA_EQ_VMA)
   SECTION_data (ram, ALIGN (0x4), LMA_EQ_VMA)
   SECTION_bss (ram, ALIGN (0x4), LMA_EQ_VMA)
   CYG_LABEL_DEFN(_heap1) = ALIGN (0x8);

Redboot prompt:
RAM: 0x00000000-0x02000000, [0x00044f88-0x01fdd000] available
FLASH: 0x60000000 - 0x60800000, 64 blocks of 0x00020000 bytes each.

Here is the section dump of linkage map file:
 .ctors.55435   0x0005f178        0x4
               0x0005f17c                __CTOR_END__ = <code 336> (.)
               0x0005f17c                __DTOR_LIST__ = <code 336> (.)
               0x0005f17c                __DTOR_END__ = <code 336> (.)
               0x0005f17c                . = ALIGN (0x4)

.got            0x00009780        0x4
 .got           0x00009780        0x4

.got.plt        0x00009784        0xc
 .got.plt       0x00009784        0xc
               0x00009784                _GLOBAL_OFFSET_TABLE_
               0x0005ec40                __rom_data_start = LOADADDR (.data)
               0x00009790                __ram_data_end = .
               0x00009790                PROVIDE (__ram_data_end, .)
               0x00009790                _edata = .
               0x00009790                PROVIDE (edata, .)
               0x0005f17c                PROVIDE (__rom_data_end,
(LOADADDR (.data) + SIZEOF (.data)))

.bss            0x00009790     0x430c
               0x00009790                __bss_start = <code 336> (.)

Why the .bss did not follow the 0x50000 base address i specified? it
looked like .bss section follow the address of got.plt section. To
bypass this problem, I pass the Tbss=60000 option to ld. After all
this, I have executable file ready, I use redboot to load ELF file to
TS7200 by serial port(ymodem).  When I issue Go cmd on redboot prompt,
my system freeze. I tried either s-record and elf format. so the
question is
Dose redboot capable run ELF executable?
Dose redboot capable run s-record executable?
Do I need make sure that ram load base address must be the same as the
ELF program entry address?

PS. some question may off-topic, or even stupid. thank you all for
your patient and suggestion


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