booting problems with the cdrom

Hiten Pandya hmp at
Sun Aug 7 08:10:39 PDT 2005

scalopus wrote:
Hi all,
  i am trying to install dfbsd in a IBM Netfinity 5000 server:, 
but I have several problems with the cdrom.

1) First i tryed the 1.2 release, this iso:
  The cd even doesn't boot, i can't see the Boot Menu (the
dragonfly acsi), it freezes in the "BTX Loader". 

2) Later i tryed the development iso:
  This cd boots, i can see the Boot menu, but when booting
the kernel it crashes when accessing to the ata, suppose the
atapi, the acd0 cdrom, with the following error:
acd0: MODE_SENSE_BIG command timeout - resetting
ata0: WARNING: atapi resetting donecount 28 for retry
ata0: resetting devices .. done
Alright.  This issue has been described before somewhere on the FreeBSD 
mailing lists but it was fixed in one of the ATA round ups if I am not 

Does this machine support more than one processor ? I.e. SMP.

Could you please boot the machine with '-v' flag so it provides verbose 
information about your hardware.

  It repeats about 5-7 times, and after it kernel crashes:

Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x20029
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc01a0c51
stack pointer = 0x10:0xc0715ca8
frame pointer = 0x10:0xc715ccc
code segment = base 0x0, limit 0xffff, type 0x1b
	     = DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 0 (swapper)
current thread = pri 108 (CRIT)
kernel: type 12 trap, code=0
Stopped at acd_describe+0x7c0: movzbl 0x5(%eax),%eax
  Maybe it is DMA issue, the CD-Rom in the bios is in
PIO Mode 3, and i can't change it.
  I can install fbsd (but i dont see after installation
the cdrom), windows 2000 server and nbsd loads the
installation. So the cdrom works fine.
It can't be a DMA issue since it is not enabled for ATAPI, aka CD-ROM type 
devices by default.  You could try turning off the ATA system's DMA by 
typing the command 'set hw.ata.dma=0' at the loader stage.

There are quite a few APIC related issues on Netfinity servers that 
require manual rewiring from the BIOS but lets hope that is not the case 
for yours. :-)


				hmp at xxxxxxxxxxxxx

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