Description of Problem:
Warm reboot on IBM 540 laptop fails. Gets DMA timeout during IDE
initialization which seems to be unrecoverable.
Cold reboot on same platform works fine.
Version-Release number of selected component (if applicable):
2.4.7-2 (and 2.4.7-2.5)
Steps to Reproduce:
I tried adding 'reboot=b' to the kernel options (as requested) with
Here are the kernel (dmesg) notes during bootup on this hardware:
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
PIIX4: IDE controller on PCI bus 00 dev 31
PIIX4: chipset revision 1
PIIX4: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0x1800-0x1807, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0x1808-0x180f, BIOS settings: hdc:pio, hdd:pio
hda: IBM-DBCA-206480, ATA DISK drive
hdc: CRN-8241B, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: 12594960 sectors (6449 MB) w/420KiB Cache, CHS=833/240/63, UDMA(33)
ide-floppy driver 0.97
hda: hda1 hda2 hda3 < hda5 >
We (Red Hat) should try to fix this before next release.
ok next one: reboot=c
(there's also reboot=h )
(oh and that has to be active _the first boot_, eg the one you will type
I'm not sure I'm doing this correctly. Here's [part] of /boot/grub/grub.conf:
title Red Hat Linux (2.4.7-2.5)
kernel /boot/vmlinuz-2.4.7-2.5 ro root=/dev/hda2 reboot=h
Is this correct?
I have tried all three recommendations (reboot=c/r/h) None of them have
any real affect on the problem. Note: reboot=h caused the system to just
stop when I ran reboot.
the grub magic is correct. Hm.
Maybe the bios gets confused by having DMA enabled;
If you try "ide=nodma" on the first boot, and it fixes it, this is indeed the
No difference. It hangs (and eventually times out) while scanning hda for
Newer IDE code scratch configures the PIIX4