Querry.-- 2/5/01

[MNShukla <mnshukla at cirrus dot stpp dot soft dot net>]

Hi,

I am compiling 2 files (init.c & data.c) by ADSv1.1 and test.c by
arm-linux-gcc. and linking all the 3 Obj's by using arm-linux-gcc linker
to generate the image. Now, I run my program on an ARM board, some time
it was working and sometimes it was giving Kernel-Panic. When I probed
it using map file, I found that whenever I access the adddress
address-range
0x0203e000  to 0x0203efff (this size is 4KB),    it gives kernel panic.
In the map file, I see the address allocated to global variable
(mnglobal -- an array of type short) is 0x0203daf4. Now if I access
mnglobal[644] or mnglobal[645] it works fine (note that &mnglobal[645] =
0x0203dffe) when I access(write) at mnglobal[646] , whose address is
0x0203e000, it gives kernal-panic. This 4KB address range is consistent.
Note that if I compare the images we get variation as follows---

|----------|-------------| ------------------------- |
| Address | Image with  |  Image with |  Image with |
|  in hex    | index 644   |  index 645   | index 646   |
|----------|-------------|-------------| ------------|
| 224        |   b8            |   ba             |  bc             |
-------------------------------------------------------

Now, if I compile init.c in arm-linux-gcc, and use the same range by the
use of map, it works fine.

What could be the problem?  Can any body give me some pointer ? The 3
files are given below....

Thanks in advance....

-Mahesh
(Mahesh Narain Shukla)
---------------------------------------
filie = init.c ---- compiled on ADS v1.1
---------------------------------------

extern short mnglobal[15000];

void init(void)
{
  mnglobal[645] = 1;
} /* init */

------------------------------------------
filie = data.c ----- compiled on ADS v1.1
------------------------------------------

short mnglobal[15000];

---------------------------------------------
filie = test.c ----- compiled on arm-linux-gcc
---------------------------------------------
# include <stdio.h>
extern short mnglobal[15000];
extern void init(void);

int main (void)
{
  init();
  mnglobal[0] = 1234 ;
  printf("\n mnglobal[0] = %d\n", mnglobal[0]);
  printf("\n &mnglobal[645] = %p\n", &mnglobal[645]);
}
-----------------------------------------------
All the above 3 files are linked by using arm-linux-gcc.

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