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) How Reproducible: Steps to Reproduce: 1. 2. 3. Actual Results: Expected Results: Additional Information:
I tried adding 'reboot=b' to the kernel options (as requested) with no improvement. 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 Partition check: 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 "reboot" in)
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) root (hd0,1) 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 problem
No difference. It hangs (and eventually times out) while scanning hda for partitions.
Newer IDE code scratch configures the PIIX4