Red Hat ENTERPRISE LINUX 3 - FOR X86-ITANIUMTM-AMD64 AND INTEL EXTENDED MEMORY 64 TECHNOLO, Installation Manual

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96 Appendix F. Additional Boot Options
to the remote display terminal and does not allow access from anyone or any system not
specifically authorized for remote access.
driverdisk
This command performs the same function as the
dd
command and also prompts you to use a
driver diskette during the installation of Red Hat Enterprise Linux.
ide=nodma
This command disables DMA on all IDE devices and may be useful when having IDE-related
problems.
linux upgradeany
This command relaxes some of the checks on your
/etc/redhat-release
file. If your
/etc/redhat-release
file has been changed from the default, your Red Hat Enterprise
Linux installation may not be found when attempting an upgrade to Red Hat Enterprise Linux 3.
Use this option only if your existing Red Hat Enterprise Linux installation was not detected.
mediacheck
This command gives you the option of testing the integrity of the install source (if an ISO-based
method). This command works with the CD, DVD, hard drive ISO, and NFS ISO installation
methods. Verifying that the ISO images are intact before you attempt an installation helps to
avoid problems that are often encountered during an installation.
mem= xxx M
This command allows you to override the amount of memory the kernel detects for the machine.
This may be needed for some older systems where only 16 MB is detected and for some new
machines where the video card shares the video memory with the main memory. When executing
this command,
xxx
should be replaced with the amount of memory in megabytes.
nmi_watchdog=1
This command enables the built-in kernel deadlock detector. This command can be used to debug
hard kernel lockups. By executing periodic NMI (Non Maskable Interrupt) interrupts, the kernel
can monitor whether any CPU has locked up and print out debugging messages as needed.
noapic
This x86 boot command tells the kernel not to use the APIC chip. It may be helpful for some
motherboards with a bad APIC (such as the Abit BP6) or with a buggy BIOS.
noht
This x86 boot command disables hyperthreading.
nofb
This command disables frame buffer support and allows the installation program to run in text
mode. This command may be necessary for accessibility with some screen reading hardware.
nomce
This x86 boot command disables self-diagnosis checks performed on the CPU. The kernel en-
ables self-diagnosis on the CPU by default (called Machine Check Exception ). Early Compaq
Pentium systems may need this option as they do not support processor error checking correctly.
A few other laptops, notably those using the Radeon IGP chipset, may also need this option.