ASK_BOOT:
Ask "Boot from (N)etwork ... or (Q)uit? " at startup, timeout after n
seconds (0 = no timeout). If unset, boot immediately using the default.
BOOT_FIRST: BOOT_NIC BOOT_DISK BOOT_FLOPPY BOOT_NOTHING
On timeout or Return key from previous question, selects the order to
try to boot from various devices.
BOOT_SECOND: BOOT_NIC BOOT_DISK BOOT_FLOPPY BOOT_NOTHING
On timeout or Return key from previous question, selects the order to
try to boot from various devices.
BOOT_THIRD: BOOT_NIC BOOT_DISK BOOT_FLOPPY BOOT_NOTHING
On timeout or Return key from previous question, selects the order to
try to boot from various devices.
BOOT_INDEX: 0 1 2 3 4 5 6 7 8 9
The device to boot from:
BAR_PROGRESS
Use rotating bar instead of sequential dots to indicate a packet
transmitted.
NO_DHCP_SUPPORT
Use BOOTP instead of DHCP
RARP_NOT_BOOTP
Use RARP instead of BOOTP/DHCP
REQUIRE_VCI_ETHERBOOT
Require an encapsulated Vendor Class Identifier of "Etherboot" in the
DHCP reply Requires DHCP support.
ALLOW_ONLY_ENCAPSULATED
Ignore Etherboot-specific options that are not within the Etherboot
encapsulated options field. This option should be enabled unless you have
a legacy DHCP server configuration from the bad old days before the use of
encapsulated Etherboot options.
DEFAULT_BOOTFILE:
Define a default bootfile for the case where your DHCP server does not
provide the information. Example:
ALLMULTI
Turns on multicast reception in the NICs.
CONGESTED
turns on packet retransmission. Use it on a congested network, where
the normal operation can't boot the image.
BACKOFF_LIMIT:
sets the maximum RFC951 backoff exponent to n. Do not set this
unreasonably low, because on networks with many machines they can saturate
the link (the delay corresponding to the exponent is a random time in the
range 0..3.5*2^n seconds). Use 5 for a VERY small network (max. 2 minutes
delay), 7 for a medium sized network (max. 7.5 minutes delay) or 10 for a
really huge network with many clients, frequent congestions (max. 1 hour
delay). On average the delay time will be half the maximum value. If in
doubt about the consequences, use a larger value. Also keep in mind that
the number of retransmissions is not changed by this setting, so the
default of 20 may no longer be appropriate. You might need to set
MAX_ARP_RETRIES, MAX_BOOTP_RETRIES, MAX_TFTP_RETRIES and MAX_RPC_RETRIES
to a larger value.
TIMEOUT:
Use with care!! See above. Sets the base of RFC2131 sleep interval to
n. This can be used with -DBACKOFF_LIMIT=0 to get a small and constant
(predictable) retry interval for embedded devices. This is to achieve
short boot delays if both the DHCP Server and the embedded device will be
powered on the same time. Otherwise if the DHCP server is ready the client
could sleep the next exponentially timeout, e.g. 70 seconds or more. This
is not what you want. n should be a multiple of TICKS_PER_SEC (18).
CAN_BOOT_DISK
Can boot from floppy/hd if bootimage matches the pattern
"/dev/[fh]d*"; if you do not have enough space in the EPROM, then disable
this feature and use "mknbi-blkdev" for booting from a local blockdevice.
TRY_FLOPPY_FIRST:
If > 0, tries that many times to read the boot sector from a floppy
drive before booting from ROM. If successful, does a local boot. It
assumes the floppy is bootable. Requires -DCAN_BOOT_DISK.
EMERGENCYDISKBOOT
if no BOOTP server can be found, then boot from local disk. The
accessibility of the TFTP server has no effect, though! So configure your
BOOTP server properly. You should probably reduce MAX_BOOTP_RETRIES to a
small number like 3.
TAGGED_IMAGE
Add tagged image kernel boot support (recommended)
AOUT_IMAGE
Add a.out kernel boot support (generic)
ELF_IMAGE
Add generic ELF kernel boot support (recommended)
EL64F_IMAGE
Add generic ELF64 kernel boot support (useful for > 4GB disks).
WINCE_IMAGE
Add the ability to boot WINCE.... now only sis630 OK!
FREEBSD_PXEEMU
Add the ability to boot PXE images... only FreeBSD supported
X86_BOOTSECTOR_IMAGE
Add the ability to boot 512 byte x86 boot sectors
IMAGE_MULTIBOOT
Add Multiboot image support (currently only for ELF images)
IMAGE_FREEBSD
Add FreeBSD image loading support (requires at least -DAOUT_IMAGE
and/or -DELF_IMAGE)
FREEBSD_KERNEL_ENV
Pass in FreeBSD kernel environment
AOUT_LYNX_KDI
Add Lynx a.out KDI support
MULTICAST_LEVEL1
Support for sending multicast packets
MULTICAST_LEVEL2
Support for receiving multicast packets
DOWNLOAD_PROTO_TFTP
If defined, boots by tftp (recommended).
DOWNLOAD_PROTO_NFS
if defined, boots from a NFS mount and disables tftp loading. Default
is DOWNLOAD_PROTO_TFTP if neither is defined.
DOWNLOAD_PROTO_SLAM
If defined, boots via Scalable Local Area Multicast.
DOWNLOAD_PROTO_TFTM
If defined, enables booting via TFTP Multicast mode.
SAFEBOOTMODE:
Enables "Safe Boot Mode": Only boot images after verification with
public-key-cryptography, this is WORK IN PROGRESS must be or'ed from one
publickey storage method and one nbi-digest method value
CONSOLE_FIRMWARE
Set for firmware/BIOS provided (default if nothing else is set).
Normally this is shows up on your CRT.
CONSOLE_SERIAL
set for serial console.
CONSOLE_DUAL
Both of the above
COMCONSOLE:
set port, e.g. 0x3F8
CONSPEED:
set speed, e.g. 57600
COMPARM:
set Line Control Register value for data bits, stop bits and parity.
See a National Semiconditor 8250/ 16450/16550 data sheet for bit meanings.
If undefined, defaults to 0x03 = 8N1.
COMPRESERVE
Ignore COMSPEED and COMPARAM and instead preserve the com port
parameters from the previous user of the com port. Examples of previous
user are a BIOS that implements console redirection, lilo and LinuxBIOS.
This makes it trivial to keep the serial port speed setting in sync
between multiple users. You set the speed in the first user and the rest
follow along.
POWERSAVE
Halt the processor when waiting for keyboard input which saves power
while waiting for user interaction. Good for compute clusters and VMware
emulation.
RELOCATE
After starting etherboot relocate to the top of memory. This allows
loading fairly arbitrary rom images. This doesn't work with a couple of
drivers, e.g. lance.
CONFIG_PCI
Include support for devices using the pci bus.
CONFIG_ISA
Include support for devices using isa bus.
PCBIOS
Compile in support for the normal pcbios
LINUXBIOS
Compile in support for LinuxBIOS
BBS_BUT_NOT_PNP_COMPLIANT
Some BIOSes claim to be PNP but they don't conform to the BBS spec
which specifies that ES:DI must point to the string $PnP on entry. This
option works around those. This option must be added to LCONFIG.
NO_DELAYED_INT
Take control as soon as BIOS detects the ROM. Normally hooks onto
INT18H or INT19H. Use only if you have a very non-conformant BIOS as it
bypasses BIOS initialisation of devices. This only works for legacy ROMs,
i.e. PCI_PNP_HEADER not defined. This option was formerly called NOINT19H.
BOOT_INT18H
Etherboot normally hooks onto INT19H for legacy ROMs. You can choose
to hook onto INT18H (BASIC interpreter entry point) instead. This entry
point is used when all boot devices have been exhausted. This option must
be added to LCONFIG.
CONFIG_PCI_DIRECT
Define this for PCI BIOSes that do not implement BIOS32 or not
correctly. Normally not needed. Only works for BIOSes of a certain era.
CONFIG_TSC_CURRTICKS
Uses the processor time stamp counter instead of reading the BIOS time
counter. This allows Etherboot to work even without a BIOS. This only
works on late model 486s and above.
CONFIG_NO_TIMER2
Some systems do not have timer2 implemented. If you have a RTC this
will allow you to roughly calibrate it using outb instructions.
PXELOADER_KEEP_UNDI
For implementation later with UNDI.
IBM_L40
This option uses the 0x92 method of controlling A20 instead of the
traditional method of using the keyboard controller. An explanation of A20
is here: http://www.win.tue.nl/~aeb/linux/kbd/A20.html
This occurs on MCA, EISA and some embedded boards, and sometimes with the
Fast Gate A20 option on some BIOSes. Enable this only if you are sure of
what you are doing.
CONFIG_X86_64
Compile in support for booting x86_64 64bit binaries.
MOVEROM
If your motherboard does not cache adapter memory space, then this
option can speed up loading of compressed BOOT-Prom images. It has no
affect on uncompressed images. Unless you are very tight on free space,
you will usually want to define this option. This option must be added to
LCONFIG! (recommended).
IGNORE_E820_MAP
Ignore the memory map returned by the E820 BIOS call. May be necessary
on some buggy BIOSes.
CONSOLE_DIRECT_VGA
Set for direct VGA console (only for x86).
ALTERNATE_DHCP_PORTS_1067_1068
Use ports 1067 and 1068 for DHCP instead of 67 and 68. As these ports
are non-standard, you need to configure your DHCP server to use them. This
option gets around existing DHCP servers which cannot be touched, for one
reason or another, at the cost of non-standard boot images.