Re: SOLUTION: Problems with DMA on IDE ServerWorks

[Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>]

the real solution is to disable generic IDE driver (CONFIG_IDE_GENERIC)

On Wed, 24 Nov 2004 19:44:34 +0000, Tribhuvan <loka@rcn.com> wrote:
> 
> 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
>