diff options
author | RajithaY <rajithax.yerrumsetty@intel.com> | 2017-04-25 03:31:15 -0700 |
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committer | Rajitha Yerrumchetty <rajithax.yerrumsetty@intel.com> | 2017-05-22 06:48:08 +0000 |
commit | bb756eebdac6fd24e8919e2c43f7d2c8c4091f59 (patch) | |
tree | ca11e03542edf2d8f631efeca5e1626d211107e3 /qemu/roms/u-boot/doc/README.pxe | |
parent | a14b48d18a9ed03ec191cf16b162206998a895ce (diff) |
Adding qemu as a submodule of KVMFORNFV
This Patch includes the changes to add qemu as a submodule to
kvmfornfv repo and make use of the updated latest qemu for the
execution of all testcase
Change-Id: I1280af507a857675c7f81d30c95255635667bdd7
Signed-off-by:RajithaY<rajithax.yerrumsetty@intel.com>
Diffstat (limited to 'qemu/roms/u-boot/doc/README.pxe')
-rw-r--r-- | qemu/roms/u-boot/doc/README.pxe | 236 |
1 files changed, 0 insertions, 236 deletions
diff --git a/qemu/roms/u-boot/doc/README.pxe b/qemu/roms/u-boot/doc/README.pxe deleted file mode 100644 index f67605cf9..000000000 --- a/qemu/roms/u-boot/doc/README.pxe +++ /dev/null @@ -1,236 +0,0 @@ -/* - * Copyright 2010-2011 Calxeda, Inc. - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -The 'pxe' commands provide a near subset of the functionality provided by -the PXELINUX boot loader. This allows U-boot based systems to be controlled -remotely using the same PXE based techniques that many non U-boot based servers -use. - -Commands -======== - -pxe get -------- - syntax: pxe get - - follows PXELINUX's rules for retrieving configuration files from a tftp - server, and supports a subset of PXELINUX's config file syntax. - - Environment - ----------- - 'pxe get' requires two environment variables to be set: - - pxefile_addr_r - should be set to a location in RAM large enough to hold - pxe files while they're being processed. Up to 16 config files may be - held in memory at once. The exact number and size of the files varies with - how the system is being used. A typical config file is a few hundred bytes - long. - - bootfile,serverip - these two are typically set in the DHCP response - handler, and correspond to fields in the DHCP response. - - 'pxe get' optionally supports these two environment variables being set: - - ethaddr - this is the standard MAC address for the ethernet adapter in use. - 'pxe get' uses it to look for a configuration file specific to a system's - MAC address. - - pxeuuid - this is a UUID in standard form using lower case hexadecimal - digits, for example, 550e8400-e29b-41d4-a716-446655440000. 'pxe get' uses - it to look for a configuration file based on the system's UUID. - - File Paths - ---------- - 'pxe get' repeatedly tries to download config files until it either - successfully downloads one or runs out of paths to try. The order and - contents of paths it tries mirrors exactly that of PXELINUX - you can - read in more detail about it at: - - http://syslinux.zytor.com/wiki/index.php/Doc/pxelinux - -pxe boot --------- - syntax: pxe boot [pxefile_addr_r] - - Interprets a pxe file stored in memory. - - pxefile_addr_r is an optional argument giving the location of the pxe file. - The file must be terminated with a NUL byte. - - Environment - ----------- - There are some environment variables that may need to be set, depending - on conditions. - - pxefile_addr_r - if the optional argument pxefile_addr_r is not supplied, - an environment variable named pxefile_addr_r must be supplied. This is - typically the same value as is used for the 'pxe get' command. - - bootfile - typically set in the DHCP response handler based on the - same field in the DHCP respone, this path is used to generate the base - directory that all other paths to files retrieved by 'pxe boot' will use. - If no bootfile is specified, paths used in pxe files will be used as is. - - serverip - typically set in the DHCP response handler, this is the IP - address of the tftp server from which other files will be retrieved. - - kernel_addr_r, initrd_addr_r - locations in RAM at which 'pxe boot' will - store the kernel and initrd it retrieves from tftp. These locations will - be passed to the bootm command to boot the kernel. These environment - variables are required to be set. - - fdt_addr_r - location in RAM at which 'pxe boot' will store the fdt blob it - retrieves from tftp. The retrieval is possible if 'fdt' label is defined in - pxe file and 'fdt_addr_r' is set. If retrieval is possible, 'fdt_addr_r' - will be passed to bootm command to boot the kernel. - - fdt_addr - the location of a fdt blob. 'fdt_addr' will be passed to bootm - command if it is set and 'fdt_addr_r' is not passed to bootm command. - -pxe file format -=============== -The pxe file format is nearly a subset of the PXELINUX file format; see -http://syslinux.zytor.com/wiki/index.php/PXELINUX. It's composed of one line -commands - global commands, and commands specific to labels. Lines begining -with # are treated as comments. White space between and at the beginning of -lines is ignored. - -The size of pxe files and the number of labels is only limited by the amount -of RAM available to U-boot. Memory for labels is dynamically allocated as -they're parsed, and memory for pxe files is statically allocated, and its -location is given by the pxefile_addr_r environment variable. The pxe code is -not aware of the size of the pxefile memory and will outgrow it if pxe files -are too large. - -Supported global commands -------------------------- -Unrecognized commands are ignored. - -default <label> - the label named here is treated as the default and is - the first label 'pxe boot' attempts to boot. - -menu title <string> - sets a title for the menu of labels being displayed. - -menu include <path> - use tftp to retrieve the pxe file at <path>, which - is then immediately parsed as if the start of its - contents were the next line in the current file. nesting - of include up to 16 files deep is supported. - -prompt <flag> - if 1, always prompt the user to enter a label to boot - from. if 0, only prompt the user if timeout expires. - -timeout <num> - wait for user input for <num>/10 seconds before - auto-booting a node. - -label <name> - begin a label definition. labels continue until - a command not recognized as a label command is seen, - or EOF is reached. - -Supported label commands ------------------------- -labels end when a command not recognized as a label command is reached, or EOF. - -menu default - set this label as the default label to boot; this is - the same behavior as the global default command but - specified in a different way - -kernel <path> - if this label is chosen, use tftp to retrieve the kernel - at <path>. it will be stored at the address indicated in - the kernel_addr_r environment variable, and that address - will be passed to bootm to boot this kernel. - -append <string> - use <string> as the kernel command line when booting this - label. - -initrd <path> - if this label is chosen, use tftp to retrieve the initrd - at <path>. it will be stored at the address indicated in - the initrd_addr_r environment variable, and that address - will be passed to bootm. - -fdt <path> - if this label is chosen, use tftp to retrieve the fdt blob - at <path>. it will be stored at the address indicated in - the fdt_addr_r environment variable, and that address will - be passed to bootm. - -localboot <flag> - Run the command defined by "localcmd" in the environment. - <flag> is ignored and is only here to match the syntax of - PXELINUX config files. - -Example -------- -Here's a couple of example files to show how this works. - -------------/tftpboot/pxelinux.cfg/menus/linux.list---------- -menu title Linux selections - -# This is the default label -label install - menu label Default Install Image - kernel kernels/install.bin - append console=ttyAMA0,38400 debug earlyprintk - initrd initrds/uzInitrdDebInstall - -# Just another label -label linux-2.6.38 - kernel kernels/linux-2.6.38.bin - append root=/dev/sdb1 - -# The locally installed kernel -label local - menu label Locally installed kernel - append root=/dev/sdb1 - localboot 1 -------------------------------------------------------------- - -------------/tftpboot/pxelinux.cfg/default------------------- -menu include pxelinux.cfg/menus/base.menu -timeout 500 - -default linux-2.6.38 -------------------------------------------------------------- - -When a pxe client retrieves and boots the default pxe file, -'pxe boot' will wait for user input for 5 seconds before booting -the linux-2.6.38 label, which will cause /tftpboot/kernels/linux-2.6.38.bin -to be downloaded, and boot with the command line "root=/dev/sdb1" - -Differences with PXELINUX -========================= -The biggest difference between U-boot's pxe and PXELINUX is that since -U-boot's pxe support is written entirely in C, it can run on any platform -with network support in U-boot. Here are some other differences between -PXELINUX and U-boot's pxe support. - -- U-boot's pxe does not support the PXELINUX DHCP option codes specified - in RFC 5071, but could be extended to do so. - -- when U-boot's pxe fails to boot, it will return control to U-boot, - allowing another command to run, other U-boot command, instead of resetting - the machine like PXELINUX. - -- U-boot's pxe doesn't rely on or provide an UNDI/PXE stack in memory, it - only uses U-boot. - -- U-boot's pxe doesn't provide the full menu implementation that PXELINUX - does, only a simple text based menu using the commands described in - this README. With PXELINUX, it's possible to have a graphical boot - menu, submenus, passwords, etc. U-boot's pxe could be extended to support - a more robust menuing system like that of PXELINUX's. - -- U-boot's pxe expects U-boot uimg's as kernels. Anything that would work - with the 'bootm' command in U-boot could work with the 'pxe boot' command. - -- U-boot's pxe only recognizes a single file on the initrd command line. It - could be extended to support multiple. - -- in U-boot's pxe, the localboot command doesn't necessarily cause a local - disk boot - it will do whatever is defined in the 'localcmd' env - variable. And since it doesn't support a full UNDI/PXE stack, the - type field is ignored. - -- the interactive prompt in U-boot's pxe only allows you to choose a label - from the menu. If you want to boot something not listed, you can ctrl+c - out of 'pxe boot' and use existing U-boot commands to accomplish it. |