88 lines
2.2 KiB
Plaintext
88 lines
2.2 KiB
Plaintext
.TH 9BOOT 8
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.SH NAME
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9bootfat, 9bootiso, 9bootpxe \- bootloaders for pc FAT, ISO and PXE network booting
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.SH SYNOPSIS
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started by BIOS or chainloaded by partition bootsector
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.SH DESCRIPTION
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The bootloader is responsible for reading the
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.IR plan9.ini (8)
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boot parameters and boot a kernel. It interprets the
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.B bootfile=
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parameter as a file path on the current boot media
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to locate the kernel image. The path should be in all
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lower case except for
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.IR 9bootpxe
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wich supports case sensitive file names. Read parameters
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are echoed on the console. The boot procedure
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can be interrupted by pressing any key after the configuration
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was read. Then a interactive boot console is shown with a
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.B >
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prompt. The syntax of the boot console is the same as in
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the
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.IR plan9.ini (8)
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file. The word
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.B clear
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will reset all current parameters and
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.B boot
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will end the console and start booting the kernel. The boot
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console is entered automatically when boot failed, no
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.B bootfile=
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parameter is specified or no
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.IR plan9.ini (8)
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was found.
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.SH FAT BOOTING
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The
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.IR 9bootfat
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program is responsible for loading the kernel from
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the
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.IR 9fat
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partition into memory and pass it the
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.IR plan9.ini (8)
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boot parameters. It gets chainloaded by
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.IR pbs
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wich locates it in the root of the active
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FAT partition as
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.B 9BOOTFAT
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file.
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Then
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.B plan9.ini
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is read from the root directory of the FAT
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filesystem.
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.SH CDROM BOOTING
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Booting from cdrom requires
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.IR 9bootiso
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to be included in the iso image under
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.B 386/9bootiso
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and also
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set as a non emulation bootblock see
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.IR mk9660 (8) .
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The BIOS loads the first 2K of
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.B 386/9bootiso
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into memory and passes execution to it. The program
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then reads the rest of its code from the file to chainload itself.
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Boot parameters are read from
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.B cfg/plan9.ini
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file.
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.SH NETWORK BOOTING
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With a PXE capable BIOS and network card, it is possible for
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a machine to download
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.IR 9bootpxe
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from a tftp server and load the kernel from there. The
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.B bootf=/386/9bootpxe
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in the machines
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.IR ndb (6)
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entry will tell the PXE BIOS to use it.
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.BR
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Once started,
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.IR 9bootpxe
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will read the file
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.B /cfg/pxe/$ether
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from the tftp server, where
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.B $ether
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is the mac address of the used network card
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in lower case hex, and use it as
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.IR plan9.ini (8)
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file.
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.SH SOURCE
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.BR /sys/src/boot/pc .
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