uClinux .data segment in SDRAM?

Thanks again,

The problem with telling it about all 1G is that I don't have all 1G of SDRAM right now -- just a 128MB stick. So, right now, my gear looks like:

0x0 - 0x07FFFFFF -- SDRAM

0x08000000 - 0x3FFFFFFF -- Nothing

0x40000000 - 0x40FFFFFF -- SRAM

So, if I understand correctly, to use free_area_init_node, I need to pass it a zholes_size array, which in my case should be { (0x40000000 - 0x08000000), 0, 0 }. I edited paging_init as shown below, and I get

uClinux/Nios II

Altera Nios II support © 2004 Microtronix Datacom Ltd.

KERNEL -> TEXT=0x40000000-0x40132c04 DATA=0x40132c10-0x40160000 BSS=0x40179350-0

x4017937d

KERNEL -> MEM=0x4017a000-0x41000000 STACK=0x41000000-0x41000000

setup_arch: No persistant network settings signature at 43FF0000

start_mem is 0x4017a000

virtual_end is 0x41000000

Built 1 zonelists

Kernel command line: root=/dev/mtdblock0 ro

PID hash table entries: 4096 (order: 12, 65536 bytes)

__alloc_bootmem_core(): zero-sized request

/cygdrive/c/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.ker

nel_0.1.5/linux-2.6.x/mm/bootmem.c(156): kernel BUG!

Dentry cache hash table entries: -2147483648 (order: -12, 0 bytes)

__alloc_bootmem_core(): zero-sized request

/cygdrive/c/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.ker

nel_0.1.5/linux-2.6.x/mm/bootmem.c(156): kernel BUG!

Inode-cache hash table entries: 1073741824 (order: -12, 0 bytes)

Any thoughts? Am I doing something blatantly wrong in the code below?

Ryan

void paging_init(void)
{
    /*
  * Make sure start_mem is page aligned, otherwise bootmem and
  * page_alloc get different views of the world.
  */
 # ifdef DEBUG
    unsigned long start_mem = PAGE_ALIGN(memory_start);
    //#endif
    unsigned long end_mem   = memory_end & PAGE_MASK;
    //#ifdef DEBUG
    printk (/*KERN_DEBUG*/ "start_mem is %#lx\nvirtual_end is %#lx\n",
  start_mem, end_mem);
    //#endif
    /*
  * Initialize the bad page table and bad page to point
  * to a couple of allocated pages.
  */
    empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
    empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
    empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
    memset((void *)empty_zero_page, 0, PAGE_SIZE);
    /*
  * Set up SFC/DFC registers (user data space).
  */
    set_fs (USER_DS);
# ifdef DEBUG
    printk (KERN_DEBUG "before free_area_init\n");
    printk (KERN_DEBUG "free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
  start_mem, end_mem);# endif
    {
  unsigned long zones_size = {0, 0, 0};
  unsigned long holes_size = {0, 0, 0};
  zones_size = (0x8000000-PAGE_OFFSET) >> PAGE_SHIFT;
  zones_size = (0x1000000-PAGE_OFFSET) >> PAGE_SHIFT;
  holes_size = zones_size-zones_size;
# ifdef CONFIG_HIGHMEM
  zones_size = 0;# endif
  //free_area_init(zones_size);
  
  free_area_init_node(0, &contig_page_data, zones_size, __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes_size);
    }
}