Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

linux kernel coredump...

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 'DE...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

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