linux kernel coredump...

Altera_Forum · ‎03-05-2015

Mr Kazu:

Hi.

I'm sorry that issue of nios2-download command is not clear.

The methord of making nios2-download command run well is to use the 1 core instead of 4 cores. The proj 'DE2_115_NIOS_HOST_MOUSE_VGA' was modeled on 'NiosII_Quad_Core' with the same components & their addresses. so the nios2-download command works fine. When the linux kernel Image was downloaded, I program the NiosII_Quad_Core.sof to the DE2-115 board.4 cores with mmu +adaptor could read the kernel from the flash and work well.

I forget that I have changed the reset vector of the boot cpu in the proj 'NiosII_Quad_Core' to boot cpu from the flash instead of memory_monitor according to your web site. Is it right?

So the core dumped contents are the same for both 'nios2-terminal < linux.initramfs.srec' and 'nios2-download -g zImage'. Could you give some clue ?Thank you.

  &#9474; &#9474;        NiosII FPGA configuration (CUSTOM_FPGA)  --->                &#9474; &#9474;  
  &#9474; &#9474;    
 HW mul support                                               &#9474; &#9474;  
  &#9474; &#9474;    
 HW mulx support                                              &#9474; &#9474;  
  &#9474; &#9474;    
 HW div support                                               &#9474; &#9474;  
  &#9474; &#9474;    (0x10000000) Offset address for uImage.flash                     &#9474; &#9474;  
  &#9474; &#9474;    
 Passed kernel command line from u-boot                       &#9474; &#9474;  
  &#9474; &#9474;    (0x00500000) Link address offset for booting                     &#9474; &#9474;  
  &#9474; &#9474;     GPIO interface                                               &#9474; &#9474;  
  &#9474; &#9474;    < > Enable NiosII PIO driver                                     &#9474; &#9474;  
  &#9474; &#9474;    
 Symmetric multi-processing support                           &#9474; &#9474;  
  &#9474; &#9474;    (4)   Maximum number of CPUs (2-32)                              &#9474; &#9474;  
  &#9474; &#9474;    
 Use Multicore Adapter for SMP support

r1:  c026ec90 r2:  c0354000 r3:  c0354000 r4:  c0354000
r5:  00000001 r6:  00000000 r7:  00000000 r8:  00000000
r9:  00000008 r10: 00000171 r11: c035aacc r12: c0356a3c
r13: c0356a40 r14: ffffffe4 r15: c020d81c
ra:  c026f520 fp:  deadbeef sp:  c025ef9c gp:  deadbeef
ea:  c026f614 estatus:  00000000
Unaligned access from kernel mode, this might be a hardware
problem, dump registers and restart the instruction
  BADADDR 0xdeadbf0f
  cause   7
  op-code 0xb800283a

kindly regards

Altera_Forum · ‎03-05-2015

Hi,

--- Quote Start ---

r1:  c026ec90 r2:  c0354000 r3:  c0354000 r4:  c0354000
r5:  00000001 r6:  00000000 r7:  00000000 r8:  00000000
r9:  00000008 r10: 00000171 r11: c035aacc r12: c0356a3c
r13: c0356a40 r14: ffffffe4 r15: c020d81c
ra:  c026f520 fp:  deadbeef sp:  c025ef9c gp:  deadbeef
ea:  c026f614 estatus:  00000000
Unaligned access from kernel mode, this might be a hardware
problem, dump registers and restart the instruction
  BADADDR 0xdeadbf0f
  cause   7
  op-code 0xb800283a

--- Quote End ---

Please get the objdump file from your 'vmlinux' and check the instruction that is located at '0xc026f614'. The opcode is really '0xb800283a' (0x**00283a means the 'ret' instruction, but 'b8' means that it refers r23 not ra) ? The exception code '7' means that the Nios2 CPU will jump to misaligned target '0xdeadbf0f'.

Kazu