Re: IDE and hot-swap disk caddies

John Summerfield
2002-03-31T14:29:05Z

Not knowing a lot about how it all works, but also not willing to give
up without trying, ....

> > > > > syslog, of course, is user-space. the real question is where does
> > > > > your (raw, kernel-level) console go. serial console?
> > > >
> > > > What do I need to do to get them on tty11?
> > >
> > > kernel-level logging can't be configured like that: it logs
> > > to physical devices.
> >
> > What are my options to get to a position I'm sure to see the kernel
> > messages as they appear?
>
> serial console. or work in text mode. or parallel console.
> the point is that panic-level kernel messages cannot possibly
> go through the regular device infrastructure, and therefore
> cannot be tidily tucked away on some other VC, etc. the serial
> and parallel console code is used directly by printk to frob
> the hardware.

I'm working in runlevel 3 (no GUI) at the console.

>
> > > > Can I play games with modules? Perhaps by defining the 5513 driver as a
> > > > module and loading it separately for each IDE channel?
> > >
> > > I don't believe so.
> >
> > What would happen I boot with ide1=noprobe and then load ide.o
> > (extracted from a modularised compile)?
>
> if you could boot with no ide, then insmod the ide, that would work.

I booted with ide1=noprobe and that came up with no IDE1 which is what
I want.

Except that, when I installed the IDE modules built from the same
source (so the versions match), this happens:
Linux version 2.4.9-31 (bhcompile@daffy.perf.redhat.com) (gcc version
2.96 20000731 (Red Hat Linux 7.1 2.96-98)) #1 Tue Feb 26 06:25:35 EST
2002
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 00000000000a0000 (usable)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 0000000003c00000 (usable)
BIOS-e820: 00000000ffff0000 - 0000000100000000 (reserved)
On node 0 totalpages: 15360
zone(0): 4096 pages.
zone(1): 11264 pages.
zone(2): 0 pages.
Kernel command line: ro root=/dev/hda2 vga=6 ide1=noprobe
ide_setup: ide1=noprobe
Initializing CPU#0
Detected 133.160 MHz processor.
<snip>
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz PCI bus speed for PIO modes; override with idebus=xx
SIS5513: IDE controller on PCI bus 00 dev 09
PCI: Found IRQ 11 for device 00:01.1
SIS5513: chipset revision 208
SIS5513: not 100% native mode: will probe irqs later
SiS5597
ide0: BM-DMA at 0xd000-0xd007, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xd008-0xd00f, BIOS settings: hdc:DMA, hdd:pio
hda: FUJITSU MPB3043ATU E, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hda: 8448300 sectors (4326 MB), CHS=525/255/63, UDMA(33)
Partition check:
hda: hda1 hda2 hda3
Floppy drive(s): fd0 is 1.44M

Doesn't my 'noprobe" mean don't probe IDE1?

and then this:
Freeing initrd memory: 414k freed
VFS: Mounted root (ext2 filesystem).
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz PCI bus speed for PIO modes; override with idebus=xx
SIS5513: IDE controller on PCI bus 00 dev 09
PCI: Found IRQ 11 for device 00:01.1
SIS5513: chipset revision 208
SIS5513: not 100% native mode: will probe irqs later
SiS5597
ide0: BM-DMA at 0xd000-0xd007 -- ERROR, PORT ADDRESSES ALREADY IN
USE
ide1: BM-DMA at 0xd008-0xd00f -- ERROR, PORT ADDRESSES ALREADY IN
USE
Journalled Block Device driver loaded

(the drive's turned off at present).

When I turned the drive on, the system instantly rebooted. If there
were any messages, there was no time to read them.

=====================================
If I boot with the drive turned on, then this happens:
The same as before for the builtin IDE driver, then ....

RAMDISK: Compressed image found at block 0
Freeing initrd memory: 414k freed
VFS: Mounted root (ext2 filesystem).
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz PCI bus speed for PIO modes; override with idebus=xx
SIS5513: IDE controller on PCI bus 00 dev 09
PCI: Found IRQ 11 for device 00:01.1
SIS5513: chipset revision 208
SIS5513: not 100% native mode: will probe irqs later
SiS5597
ide0: BM-DMA at 0xd000-0xd007 -- ERROR, PORT ADDRESSES ALREADY IN
USE
ide1: BM-DMA at 0xd008-0xd00f -- ERROR, PORT ADDRESSES ALREADY IN
USE
hdc: M1614TA, ATA DISK drive
ide1 at 0x170-0x177,0x376 on irq 15
hdc: 2131584 sectors (1091 MB) w/64KiB Cache, CHS=2114/16/63
hdc: hdc1 hdc2 hdc3
Journalled Block Device driver loaded
kjournald starting. Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.

On the screen, there's a message (I guess from modprobe) about loading
the three modules.

These are the modules loaded:
Module Size Used by Not tainted
parport_pc 14692 1 (autoclean)
lp 6400 0 (autoclean)
parport 25568 1 (autoclean) [parport_pc lp]
appletalk 20972 12
iptable_filter 2176 0 (autoclean) (unused)
ip_tables 11712 1 [iptable_filter]
epic100 12260 1
ne 7136 0 (unused)
8390 6624 0 [ne]
ext3 62512 2
jbd 40320 2 [ext3]
ide-disk 7152 0
ide-probe-mod 8416 0
ide-mod 144128 0 [ide-disk ide-probe-mod]

The only entries in /etc/modules.conf pertain to the printer and
network interfaces.

How do I control when these modules load?

fwiw it seems that I can unload/reload those modules as I like, until I
cycle power on the drive.

>
> > On this system, it does not matter if I destroy filesystems while
> > testing, though I don't wish to fry any hardware.
>
> the risk of frying hardware is *inherent* to ide hotplug,
> since the hardware doesn't support HP.
>

--
Cheers
John Summerfield

Microsoft's most solid OS: http://www.geocities.com/rcwoolley/

Note: mail delivered to me is deemed to be intended for me, for my
disposition.

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