LinuxQuestions.org - Setting Kernel parameters for SUSE10 on s390

I think you can pass that parameter to the kernel at boot time.
I do not know if you are using lilo or grub as your bootloader, but if lilo you'll need to edit /etc/lilo.conf and add that to your kernel boot line eg

Code:

default="MDK9.1-hdb3-MWA"

boot=/dev/hda

map=/boot/map

keytable=/boot/uk.klt

prompt

nowarn

timeout=20

message=/boot/message

menu-scheme=wb:bw:wb:bw

image=/boot/vmlinuz-2.4.21-0.13MWAmdk

        label="MDK9.1-hdb3-MWA"

        root=/dev/hdb3

        initrd=/boot/initrd-2.4.21-0.13MWAmdk.img

        append="max_scsi_luns=7 noapic nolapic devfs=mount acpi=off resume=/dev/hdb2"

        vga=788

        read-only

becomes

Code:

default="MDK9.1-hdb3-MWA"

boot=/dev/hda

map=/boot/map

keytable=/boot/uk.klt

prompt

nowarn

timeout=20

message=/boot/message

menu-scheme=wb:bw:wb:bw

image=/boot/vmlinuz-2.4.21-0.13MWAmdk

        label="MDK9.1-hdb3-MWA"

        root=/dev/hdb3

        initrd=/boot/initrd-2.4.21-0.13MWAmdk.img

        append="max_scsi_luns=7 noapic nolapic devfs=mount acpi=off resume=/dev/hdb2 mem=nn"

        vga=788

        read-only

Then re-run /sbin/lilo
Then reboot.
I do not know what number you need to put as "nn" - you'll have to experiment!

For grub, the procedure should be similar:
Edit the file /boot/grub/menu.lst
Find the bit that refers to the kernel you are booting and add the mem=nn bit
So

Code:

kernel /vmlinuz-2.6.15-27-386 root=/dev/hda5 ro quiet splash vga=normal

Becomes:

Code:

kernel /vmlinuz-2.6.15-27-386 root=/dev/hda5 ro quiet splash vga=normal mem=nn

Again, I do not know what you need to put as "nn"
Then just reboot
Edit: You should check /var/log/messages to see if the parameter was recognised after the next boot,