All,
I am experiencing a machine check on a custom AMCC 405EX PPC board. Our board is based on the AMCC Kilauea evaluation board. We have a few of these boards that are up and running, but I am trying to track down a machine check error on a couple of them.
My question for you is this: when the registers are printed to the console, there is one called TRAP. I want to know how/where/when and with what data that gets populated. I have read through the AMCC manuals a couple of times trying to find it and have searched through the U-Boot code to no avail. All I know is that there is a data type "struct pt_regs*" that contains all that data, but nowhere can I find where it is populated.
Below is the console output. The line "!!!! PAUSE !!!!" was inserted by me after I copied the text from the console to remind me of the ~20 second pause that occurs at that point.
I am hoping that someone can point me to the bit definitions for whatever register is being displayed in TRAP. From there, I think I can trace the problem back to the specific piece of hardware and get it fixed.
Thanks!
Jonathan
U-Boot 1.3.4 (Apr 28 2009 - 16:10:06)
CPU: AMCC PowerPC 405EX Rev. C at 400 MHz (PLB=200, OPB=100, EBC=100 MHz) Security support Bootstrap Option C - Boot ROM Location EBC (16 bits) 16 kB I-Cache 16 kB D-Cache Board: SDLPPC - RT PPC405EX Board I2C: ready DRAM: 256 MB Reserving 16384k for kernel logbuffer at 0fffb000 Top of RAM usable for U-Boot at: 0fffb000 Reserving 306k for U-Boot at: 0ffae000 Reserving 1040k for malloc() at: 0feaa000 Reserving 124 Bytes for Board Info at: 0fea9f84 Reserving 64 Bytes for Global Data at: 0fea9f44 Stack Pointer at: 0fea9f28 New Stack Pointer is: 0fea9f28 !!!! PAUSE !!!! Now running in RAM - U-Boot at: 0ffae000 -> Initializing logBuff pointers... -> Calling post_output_backlog()... -> Calling post_reloc()... -> Sync'ing CPU... -> Setting up trap handlers... Bus Fault @ 0x00000000, fixup 0x00000000 Machine Check Exception. Caused by (from msr): regs 0fea9de8 Instruction Synchronous Machine Check exception NIP: 00000000 XER: 20000000 LR: 0FFB071C REGS: 0fea9de8 TRAP: 0200 DEAR: 00000000 MSR: 00000000 EE: 0 PR: 0 FP: 0 ME: 0 IR/DR: 00
GPR00: 0FFB039C 0FEA9ED8 0FEA9F44 0FFAE000 0FFB3D6C 00000001 00000001 00021000 GPR08: 00000600 00002098 17D78400 00000002 2BA7DEF3 FFFFFFFF 0FFF1D00 1000E000 GPR16: 775DF377 FFFFF6FF FFFFFFFF FF5FF7FF FFFFFFFF FFFFFFFF FFDFFFFF FF7FFFFF GPR24: 0000A000 0FEA9F44 0FFAE000 0FEA9F84 0FEAE000 0FEA9F84 0FFF1ED8 00000000 Call backtrace: 0FFB3D64 0FFB06A4 machine check
-- Jonathan R. Haws Electrical Engineering Space Dynamics Laboratory
Jonathan.Haws@sdl.usu.edu (435)797-4629