uClinux MMU - Kernel panic

[Altera_Forum]

After I succesfully downloaded image to sdram I get such of error. 

 My sdram is 8MB and image is 3007KB.  nios2-terminal:  Uncompressing Linux... Ok, booting the kernel. Linux version 2.6.34-00692-g5bc7853-dirty (lukasz@srv) (gcc version 4.1.2)# 79 Fri Mar 25 14:59:52 CET 2011 bootconsole [early0] enabled early_console initialized at 0xe1809050   Linux/Nios II-MMU init_bootmem_node(?,0xbc2, 0x800, 0x1000) free_bootmem(0xbc2000, 0x43e000) reserve_bootmem(0xbc2000, 0x100) Built 1 zonelists in Zone order, mobility grouping off. Total pages: 2032 Kernel command line:  PID hash table entries: 32 (order: -5, 128 bytes) Dentry cache hash table entries: 1024 (order: 0, 4096 bytes) Inode-cache hash table entries: 1024 (order: 0, 4096 bytes) We have 4096 pages of RAM Memory available: 4260k/3847k RAM, 0k/0k ROM (1098k kernel code, 2748k data) Hierarchical RCU implementation. NR_IRQS:32 Calibrating delay loop... 24.16 BogoMIPS (lpj=120832) Mount-cache hash table entries: 512 init_BSP(): registering device resources Switching to clocksource timer swapper invoked oom-killer: gfp_mask=0x200d2, order=0, oom_adj=0 Stack from c0c18b74:     000200d2  c084a2a4  00000000  000200d2  00000000  00000000  c0bac424  c0bac424     00000000  00000000  c084a884  00000000  000200d2  00000004  35df8f9f  000200d2     00000000  00000000  c0bb2ddc  00000001  00000000  c084a8ec  00000000  00000000     000200d2  c084dcac  00000001  00000042  c0bb253c  00000000  c0bb253c  00000000     00000000  00000000  00000000  c0c17bc0  00000040  c0bb253c  00000000  000200d2     00000010  c0bb2de0  00000000  00000001  00000001  00000000  00000000  00000000  Call Trace:     [<c08476c0>]  [<c088b5a4>]  [<c0846948>]  [<c08481a4>]     [<c080cb60>]  [<c0845634>]  [<c0816c24>]  [<c08483e0>]     [<c086d664>]  [<c08d2924>]  [<c086deac>]  [<c086e528>]     [<c08c294c>]  [<c0800210>]  [<c08a0000>]  [<c0802254>]     [<c080be74>]  [<c08021b8>]  [<c0801034>]  [<c0802248>]  Mem-Info: DMA per-cpu: CPU 0: hi: 0, btch: 1 usd: 0 active_anon:0 inactive_anon:0 isolated_anon:0  active_file:5 inactive_file:0 isolated_file:0  unevictable:945 dirty:0 writeback:0 unstable:0  free:0 slab_reclaimable:26 slab_unreclaimable:70  mapped:0 shmem:0 pagetables:0 bounce:0 DMA free:0kB min:0kB low:0kB high:0kB active_anon:0kB inactive_anon:0kB active_file:20kB inactive_file:0kB unevictable:3780kB isolated(anon):0kB isolated(file):0kB present:8128kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:104kB slab_unreclaimable:280kB kernel_stack:36kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:945 all_unreclaimable? no lowmem_reserve[]: 0 0 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB 950 total pagecache pages 2048 pages RAM 983 pages reserved 0 pages shared 1030 pages non-shared Kernel panic - not syncing: Out of memory and no killable processes...

[Altera_Forum]

I'm trying resolve this. Any helps/ideas?

[Altera_Forum]

You're running out of memory, somehow only 4MB get recognized: 

 Memory available: 4260k/3847k RAM, 0k/0k ROM (1098k kernel code, 2748k data  this menas only about 400kB are available for userspace etc. which is way to small. I guess even 8MB will probably be too small, depending on the configuration of your image (kernel and userspace-tools).  What value does DDR2_TOP_SPAN in your generated header file have?

[Altera_Forum]

I have 8MB sdram. I tried to make small my kernel but I dont know what can I delete from it. When I download image I have to download 3007kB. 

 DDR2_TOP_SPAN is 8388608  Can I tunn it somehow to run it on 8MB sdram?

[Altera_Forum]

Sorry, I was wrong. The whole 8MB of RAM seem to have been used, not only 4MB. But it still seems to be too small for your current image. 

 Please try to deselect as many drivers/options as possible from the kernel and as many userspace tools and libraries from the "Application/Library Settings" menuconfig. You should be able to produce an image of around 2MB

[Altera_Forum]

Fortunately I have to run more stuff like ethernet GPIO and so on and I get new de2-70 board with more memory. I connect 32MB and now its working. Free shows: 

 free  total used free shared buffers  Mem: 30992 7784 23208 0 0  Swap: 0 0 0 Total: 30992 7784 23208