I've send a email before about this[1], but a situation is not changed
until now. My friends does confirm the situation recently[2], so I
send a email again...
***
It seems that recent (as of May/2001) 5-current kernel cannot mount
CD9660 filesystem (usually CD-ROM) as a root filesystem. The kernel
behavior is a little bit different both ATAPI CD-ROM and SCSI CD-ROM.
- ATAPI CD-ROM (using 440BX/i815 motherboard, on-board IDE)
As said before[1], kernel try to mount but failed.
Mounting root from cd9660:cd0a
setrootbyname failed
iso_mountroot: can't find rootvp
Root mount failed: 6
Mounting root from cd9660:acd0a
setrootbyname failed
iso_mountroot: can't find rootvp
Root mount failed: 6
Mounting root from cd9660:wcd0a
setrootbyname failed
iso_mountroot: can't find rootvp
Root mount failed: 6
No matter the kernel can mount root filesystem or not, it seems that
src/sys/vfs_conf.c needs modification, no 'wcd' anymore:)
- SCSI CD-ROM (using AHA-2940UW as SCSI HA)
Unfortunately, kernel panics when it try to mount CD-ROM.
Mounting root from cd9660:cd0a
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x28
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc025f4e7
stack pointer = 0x10:0xc05cedb4
frame pointer = 0x10:0xc05cedd8
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enables, resume, IOPL=0
current process = 0 (swapper)
kernel: type 12 trap, code = 0
Stopped at dsioctl+0x3f: movl 0xc(%eax),%eax
As a result, mounting CD9660 filesystem (formaly CD9660_ROOT) is
broken in recent 5-current.
Any clues?
P.S.: A procedure to make a CD-ROM itself is shown in my previous email[1].
-- -
Makoto `MAR' MATSUSHITA
Appendix:
[1]
http://docs.freebsd.org/cgi/getmsg.cgi?fetch=17671+0+archive/2001/freebsd-current/20010422.freebsd-current
[2] Thanks to kuriyama-san (ATAPI CD-ROM case) and motoyuki-san (SCSI
CD-ROM case).
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