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Subjectncr53c875-0-<0,0>: M_REJECT received due to xm3401b cd-rom
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Since kernel >2.1.107, i.e. ncr53c8xx-3.0e, linux does no longer boot
on this machine:

- IBM DCHS39100-UW, 9GB hard disk, id 1, autostart active,
active termination, parity + TISN active
| 25cm uw/68pin ribbon-cable
- SYM8751SP scsi adapter
| 31cm 50pin ribbon
- toshiba XM-3401B cd-rom, id 4, no term, parity enabled,
Burst: 4.2MBytes/sec(sync), 1.5MB/s(async)
| 35 cm
- IBM DFHS34320, 4.5GB hard disk, id 0, autostart,
active termination, parity + TISN active

This works pretty well since 14 months, up to kernel 2.1.107.

Newer kernels give

> ncr53c875-0-<0,0>: M_REJECT received (75:8).

Last .config for 2.1.119 says:

> CONFIG_SCSI_NCR53C8XX=y
> CONFIG_SCSI_NCR53C8XX_DEFAULT_TAGS=1
> CONFIG_SCSI_NCR53C8XX_MAX_TAGS=4
> CONFIG_SCSI_NCR53C8XX_SYNC=0
> # CONFIG_SCSI_NCR53C8XX_PROFILE is not set
> # CONFIG_SCSI_NCR53C8XX_IOMAPPED is not set

There is no (scsi) error when i disconnect the XM-3401B cd-rom.

There is no error, as long as the XM-3401B is disconnected, when i add
both a HP 35480A dat drive (typ: 366-732kB/sec), id 3 and a fujitsu
m2511a MO disk drive (Burst: 4.0MB/sec/sync, 2.7MB/s/async), id 2.

I may even reduce cabling distance to 10cm, with 170cm total length and
use passive termination at the scsi II end without getting errors for
2.1.11[79], as long as the cd-rom is not connected.

Any hints (besides discarding that outdated 2.2 speed caddy needing
cd-rom drive)?

gerhard.



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