Hello,
I want to use the RTEMS region manager but the function
rtems_region_create() fails with code RTEMS_INVALID_ADDRESS.
I am using RTEMS 4.10 on a LEON4 processor.
My RTEMS configuration information includes:
#define CONFIGURE_MAXIMUM_REGIONS 1
According to the RTEMS C User's Guide, RTEMS_INVALID_ADDRESS should be
caused by one of the following:
- starting address is NULL
- id is NULL
- starting address is not on a four byte boundary.
But in my case it looks like none of the above conditions is true.
Here is a snippet of my code:
###########################################
static int memory_region[MEM_REGION_LENGTH_32BITS];
void memory_regions_init (void)
{
rtems_status_code ret_code;
Mem_region_name = rtems_build_name('M', 'E', 'M', 'R');
ret_code = rtems_region_create(Mem_region_name, (void *)
memory_region, MEM_REGION_LENGTH_BYTES, MEM_REGION_PAGE_SIZE_BYTES,
RTEMS_DEFAULT_ATTRIBUTES, &Mem_region_id);
if (ret_code != RTEMS_SUCCESSFUL)
{
.....
}
// debugging
printf("address of memory_region[] is 0x%08X\n", memory_region);
printf("address of Mem_region_id is 0x%08X\n", &Mem_region_id);
}
###########################################
The printfs give this output:
address of memory_region[] is 0x40546EBC
address of Mem_region_id is 0x40551C00
from which we see that the starting address is 0x40546EBC = 1079275196,
which is a multiple of 4, so it should be on a 4-byte boundary.
If I tweak a bit the code and the starting address (i.e. the address of
memory_region[]) turns out to be 0x4054C2F8 (= 1079296760 which is a
multiple of 4 and 8 as well) then the function rtems_region_create()
returns RTEMS_SUCCESSFUL.
Does anybody know what the cause of this problem could be?
Thanks in advance!
Francesco
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