Messages in this thread | | | Date | Wed, 24 Nov 2004 19:44:34 +0000 | From | Tribhuvan <> | Subject | SOLUTION: Problems with DMA on IDE ServerWorks |
| |
The original post was regarding the inability to use DMA on drives connected to the IDE interface on a ServerWorks mainboard under linux (kernel=any)
The problem is that the standard PCI driver has been attached to the IDE before the serverworks driver which causes the latter not to be used:
relavant boot-console output:
[ ... too early ... built-in ide driver loads ... ] Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 ide: Assuming 66MHz system bus speed for PIO modes hdd: HL-DT-ST CD-ROM GCR-8480B, ATAPI CD/DVD-ROM drive
[ ... too late ... ServerWorks IDE driver fails ... ] SvrWks CSB5: port 0x0170 already claimed by ide1
DMA will not work.
SOLUTION:
Build all of the PCI/IDE drivers as _modules_ and re-install the kernel. The mkinitrd script should insert the insmod calls into the linuxrc script in initrd, but you may want to check.
1) reconfigure the kernel: all PCI/IDE drivers selected as modules (including serverworks.ko) 2) Re-install kernel: make; make modules_install; make install 3) Check linuxrc:
("xyz" below is a fake name for your initrd file - will differ on each machine - mine is "initrd-2.6.9")
# cp /boot/initrd-xyz /tmp/tmp/initrd-xyz.gz #(added .gz extension) # gunzip /tmp/initrd-xyz.gz # mkdir -p /mnt/initrd && mount -o loop /tmp/initrd-xyz /mnt/initrd # cd /mnt/initrd # vi linuxrc
About half way down in the linuxrc script you should see something similar to the following:
# echo "Starting udev" # echo "/sbin/udev" > /proc/sys/kernel/hotplug # echo "Creating devices" # UDEVSTART_ON_BOOT=1 # export UDEVSTART_ON_BOOT # /sbin/udevstart
# echo "Loading kernel/drivers/ide/pci/serverworks.ko" # insmod /lib/modules/2.6.9/kernel/drivers/ide/pci/serverworks.ko
# echo "Loading kernel/drivers/ide/ide-disk.ko" # insmod /lib/modules/2.6.9/kernel/drivers/ide/ide-disk.ko
# echo "Loading kernel/drivers/cdrom/cdrom.ko" # insmod /lib/modules/2.6.9/kernel/drivers/cdrom/cdrom.ko
# echo "Loading kernel/drivers/ide/ide-cd.ko" # insmod /lib/modules/2.6.9/kernel/drivers/ide/ide-cd.ko
If it looks OK, just reboot and do:
# hdparm -d1 /dev/hdX
and you should see something like:
/dev/hdc: setting using_dma to 1 (on) using_dma = 1 (on)
DONE
If not, add the `insmod` lines to linuxrc and save it, then:
install the new initrd file:
# cd /tmp && umount /mnt/initrd # gzip -9 initrd-xyz # cp initrd-xyz.gz /boot/initrd-xyz #(removed .gz extension)
REBOOT and # hdparm -d1 /dev/hdX
DONE
The console messages shoule indicate proper loading of the serverworks driver - at which time the hdX messages will appear.
Since I saw the problem didn't have a solution posted, I thought I'd send it - even though original post was a few months back...
Tribh
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |