andersee is currently certified at Master level.

Name: Erik Andersen
Member since: 2001-03-20 03:42:34
Last Login: N/A

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Homepage: http://codepoet.org/andersen/erik/erik.html

Notes:

I'm just some guy. I have been hacking Linux since 1996, when I became a Debian developer and took over maintaining the Linux kernel CD-ROM subsystem. Ever see the Uniform CD-ROM driver when you boot up linux? Well I'm the one that made it be uniform (and in fact, I'm the one that wrote that particular boot message). See back then, there were 68 flavors of strange cdrom drivers, all different. I established the current cdrom.h header file that defines exactly how cdrom drives operate under Linux, I adjusted the work-in-progress cdrom.o driver, then I went through and ported the various wierd cdrom drivers to all go through the uniform driver. The funny thing is, I don't even have very many CDs. I only got into the job bacuse I made the mistake of buying a 4 slot cdrom changer that was badly supported. So I started downloading specs and hacking the kernel and pretty soon I was maintaining things. Eventually, I ended up getting really sick with cancer, and I gave up the cdrom stuff to Jens Axboe, who has now been doing the job for a couple of years.

Anyways, fortunately, I got better. Since I no longer maintained the cdrom drivers for the kernel I was free to work on other things for the first time in a few years. I spent a while hacking 3D stuff and doing VRML, but that got boring. So then I began working on GnomeHack, a port of the venerable, but still wonderful role-playing game of nethack to the Gnome windowing system and the Gtk toolkit. This has now been integrated into the mainline nethack source tree.

These days, my major project is BusyBox, a GPLed suite of tiny UNIX utilities that provides a pretty complete POSIX environment in a very small package. I have rewritten most of it, and added tons of functionality (all optional of course). It was originaly written for the Debian boot-floppies by Bruce Perens, but really makes an excellent base for small or embedded systems.

Over the past year, I did a port of uClinux for the Atmel at91 series arm7tdmi cpus. I have adopted the orphaned uClibc C library for embedded systems. I initially did an x86 and an ARM port and I've recently made it work as a shared library. My work on uClibc has now become the One True Source Tree(tm), and it now lives at cvs.uclinux.org.

In the April Embedded Systems Conference, in San Francisco, I will be presenting a paper on "Rolling your own Embedded Linux Distribution", where I will walk people through the process of making their own embedded Linux distribution. The cool thing is that the entire user space on this embedded distro, based on Busybox and the uClibc, shared library is maintained by me. And what is even more cool is that it all weighs in at only 350k. Not too bad I think.

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Well, I've got the new ld.so working very nicely now in uClibc. Also some nice news -- I've put together a quite complete math library and checked that in yesterday. I think uClibc is just about ready for some heavy duty industrial use (which is exactly what I am working on next).

I got the uClibc shared library loader working today. Much of the initial porting effort was done by Manuel. I am not very happy with the way multiple architectures are supported with ld.so -- its cross platform support really needs some rethinking in the future. Regardless, it is now working flawlessly on x86. I've started porting the shared lib loader to ARM, but it is not ready yet (i.e. doesn't even compile).

One downside to running several Open Source projects is that when working on one, the other gets neglected. I've been neglecting BusyBox for the last few days...

Today I got busybox 0.51 released. Finally. I'm really proud of this release. It is very very solid. I'm leaving to fly out to ESC in about an hour. It should be a lot of fun. It is looking like a group of BusyBox folks will be getting together for dinner on the 12th. It will be nice to have some faces for the names.

I got busybox running on ia64 today, which ended up being a lot more work then expected. On most architectures, you can use the _syscall[0-5] macros from /usr/include/asm/unistd.h, but for some silly reason that I don't understand, the ia64 developers made those macros reference a kernel symbol. Ugh. I only needed two syscalls that were not in glibc on ia64, and those I just stuck in wrapper functions which use syscall() to do the dirty work. Managed to shave off about 500bytes in the process -- even more if you include insmod.

While fixing up busybox, I fixed up uClibc's syscall support a bit by adding a few obscure syscalls also provided by glibc. Mostly kernel module related stuff. This has the nice side effect that busybox compiles vs uClibc again (the syscall adjustment had broken it).

Well, it seems that having an account here is the thing to do ... So here goes.

 

andersee certified others as follows:

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