[RFC] How to install without
<tlaronde <at> polynum.com>
2012-02-02 13:34:47 GMT
Since it seems that Iruatã Souza, who had accepted to give a second look
at what I wrote, is as short on time as I am, here is for review an
explanation about "how to do [an install] without". [Still TODO: fix
disk/fdisk.]
Installing Plan9 without a CD reader or a PXE boot.
Abstract
The Plan9 distribution is available for installation by the mean of a
bootable ISO image supposed to be burnt on a CDROM. But this image has
indeed all the pieces needed to realize an installation, without a CD
reader, or without a PXE boot.
What follows is an illustration of "how to do without".
0. What was first? The egg or the goose? Well: the egg, that is some
BIOS.
In the following, the names will match the pc world; but, more or less,
there is a mapping between pc idiosynchrasies and something else
idiosynchrasies.
When a pc starts, it first initializes its hardware before giving the
hand to an user provided program---generally an operating system. But to
be able to hand over to something else, it has to know the rendez-vous
point. This BIOS entry point is a 512 bytes sector, that is a program,
and that is (for disks and like) the very first sector of the device.
On disks, it is called: MBR. It is a program with a signature (for basic
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