Standalone RK bootstrap fails on UBA1
Chris Torek
chris at mimsy.UUCP
Tue Dec 16 10:11:18 AEST 1986
Index: /sys/stand/rk.c 4.3BSD Fix
Description:
The standalone RK06/RK07 driver cannot talk to an RK07 on
UBA1, due to a botch in rkstrategy() in /sys/stand/rk.c:
short dn, cn, sn, tn;
...
dn = io->i_unit;
...
rkaddr->rkcs2 = dn;
io->i_unit is in the range [8..15], so this writes the
`release' bit as well as the drive number, which confuses
the controller.
Repeat-By:
Attach an RK07 to UBA1. Try to boot. Watch it hang.
Fix:
Saner (but untested) code:
short cn, sn, tn;
...
rkaddr->rkcs2 = io->i_unit & 7;
--
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7690)
UUCP: seismo!mimsy!chris ARPA/CSNet: chris at mimsy.umd.edu
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