On Fri, 2003-12-19 at 00:36, Eric W. Biederman wrote:
Brainstorming earlier today I think I have found a way
an linux kernel for the boot loader and to implement pcbios
compatibility without too much cost. The idea is to use
a uclinux kernel. And implement a ``user space'' aplication
that is a user space shim that makes kernel calls.
There are a few nasty details to work out like how to handle
services that are expected to work in vm86 mode. But I'm
not certain I care.
Curse you, Eric, this was my idea. :)
But I approached it from a different angle. Getting Etherboot (the
driver library and higher level code) to export PXE - effectively
Intel's retrofit of networking code into the legacy BIOS - is similar to
exporting LinuxBIOS's hardware initialisation library and a non-trivial
OS via PC BIOS services. If VMWare, bochs or whatever can do it as a
user space process, then it can be done all of a pece in firmware,
[For those of you not on etherboot-developers, I've waved my arms about
recently at Eric, Ken Yap and others about how to resurrect the PXE code
And yes, the "interesting" stuff is how to switch modes as appropriate
and to sort out how to organise memory without frightening the horses.
I'm on a very steep learning curve. And on the bottom of it, frankly.
The only difference between us is that I was thinking of building this
on eCos, not uclinux. eCos is designed to minimally load only those bits
of functionality needed. I don't think this affects the basic idea.