[openrisc] problem with linker script for or1ksim

[Xiaoping Li <xpli_79@yahoo.com>]

Hi,
I compiled most of the sample codes under testbench in
or1ksim using “default.ld” linker script and ran the
binary codes under or1k simulator using “default.cfg”
simulation configure file. Every code ran smoothly
from the beginning to the end. Then, I changed the
linker script in such a way that the “flush” memory
region is removed, that is, the memory is all ram (I
want to allocate every thing within an 16MB SDRAM). I
recompiled those sample codes and ran again with
“default.cfg”, but I got the following message:

Keyboard Interrupt.... kbd kresp 0 kbd_buf_count 4
Keyboard Interrupt.... kbd kresp 0 kbd_buf_count 6
Keyboard Interrupt.... kbd kresp 0 kbd_buf_count 8
Keyboard Interrupt.... kbd kresp 0 kbd_buf_count c
Keyboard Interrupt.... kbd kresp 0 kbd_buf_count e
....
all the time for each sample program. I checked the
execution log file and found nothing got executed
except “l.j 0x0” instruction at pc counter 0x100 and
0x104.

The following is the linker script I modified from
“default.ld”:
MEMORY
        {
        except : ORIGIN = 0x00000000, LENGTH =
0x00002000 
        ram     : ORIGIN = 0x00002000, LENGTH =
0x01000000 - 0x00002000
        }

SECTIONS
{

        .text :
        {
        *(.text)
	_src_beg = .;
        } > ram

        .except :
        {
	_except_beg = .;
        *(.crc)
        *(.except)
	_except_end = .;
        } > except

        .data :
        {
	_dst_beg = .;
        *(.data)
	_dst_end = .;
        } > ram

        .bss :
        {
        *(.bss)
        } > ram

        .stack ALIGN(0x10) (NOLOAD):
        {
        *(.stack)
        _ram_end = .;
        } > ram
}

I am not so familiar with gnu linker script, so I am
wondering the above script may cause the problem.
Please correct the script if something wrong with it.
Another unclear thing to me is the simulation
configuration file. In this case, do I need change
“default.cfg” for running the program (like disable
memory device “flush”)? Please show me what’s the
correct configuration file for simulation.

Thanks


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