Messages in this thread | | | Date | Fri, 6 Apr 2001 19:09:43 +0200 (CEST) | From | Gérard Roudier <> | Subject | Re: st corruption with 2.4.3-pre4 |
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On Thu, 5 Apr 2001, Geert Uytterhoeven wrote:
> > BTW, my 2.4.3-pre8 kernel just said > > | sym53c875-0:0: ERROR (81:0) (3-21-0) (10/9d) @ (script 8a8:0b000000).
Illegal instruction detected.
> | sym53c875-0: script cmd = 11000000 > | sym53c875-0: regdump: da 10 80 9d 47 10 00 0d 00 03 80 21 80 01 09 09 00 30 4e 00 08 ff ff ff. > | sym53c875-0-<0,*>: FAST-20 WIDE SCSI 40.0 MB/s (50.0 ns, offset 16) > > during the boot process, and continued without problems. What does this mean?
Looks extremally serious to me.
The SCRIPTS processor should be fetching CHMOV DSA relative when DATA_IN instructions. This corresponds to opcode 0x11000000.
However, it seems to have fetched instruction 0x0b000000 which is a MOVE ABSOLUTE WHEN STATUS PHASE.
In (3-21-0) we can see that the chip is expecting STATUS PHASE (3), but the target is driving DATA IN phase (21 - the 1 indicates DATA IN phase).
In other word, the SCRIPTS processor seems to have fetched a bogus instruction. The signaled 'illegal instruction detected' may be due to the count of bytes to transfer to be zero.
> Gr{oetje,eeting}s,
Gérard.
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