Studienprojekt Nr. 1931

Betreuer: Dipl.-Inf. Günter Bartsch
begonnen: 24.11.2003
beendet: 24.5.2004

LEON-basiertes SoC-Framework zur Unterstützung der Hardwareentwicklung in Lehre und Forschung

Aufgrund der steigenden Integrationsdichte beim Hardwareentwurf wird der modulare Entwurf zunehmend wichtiger. Durch die immer kürzer werdenden Entwicklungszyklen gewinnt reprogrammierbare Logik gegenüber traditioneller ASIC-Technologie immer mehr an Bedeutung. Gerade im universitären Umfeld bieten sich die FPGA Technologie zur schnellen Evaluation eigener Designs an und führt in der Industrie zu einer kürzeren Entwicklungszeit bis zur Marktreife. Diese Trends führen zur Verschiebung der Entwurfsmethodologie vom traditionellen Custom-Design hin zum Core basierten Entwurfsstil. Im universitären Bereich bieten sich durch freie Cores vielfältige Möglichkeiten. Ziel dieses Studienprojektes ist eine dafür geeignete Entwicklungsumgebung bereitzustellen und zu evaluieren um eine Grundlage für den Einsatz in Forschung und Lehre zu bieten.

report (german)

leon2 support for linux 2.6.x

about

here you find a patchset and some other files you need to get linux 2.6.x run on mmu-enabled leon2 platform from gaisler research. this work is derived from the linux patches gaisler research provides and konrad eisele worked on.

not much documentation here yet. quick intro: you need a sparc cross compiler (e.g. from gaisler.com) and genromfs tool. extract tarball change into the created directory. drop latest busybox and linux tarballs (busybox-1.00-pre8.tar.gz, linux-2.6.5.tar.bz2) into arc subdir. check toplevel makefile, type make. additional informations in README.

download

here is the latest tarball for download: linux-2.6.5-l1.tar.gz and its contents.

you can also download the patches seperately (these are included in the tarball):

nocache_npages_min.patch decreases the minimal nocache memory size; required for very low-mem systems
leon_kernel.patch leon platform support
arc/serial contains leon uart driver
arc/oc_ethmac contains driver for opencores ethermac

changelog

0.0.4 -> 2.6.5-l1

ported patches to 2.6.5
implementor's id is 0xf
make tags fixed
network-enabled linux .config updated
some asi workarounds
versioning and tarball name - erm - fixed ;)
fixed missing section in linker scripts, thanks to ulrich gries
nonzero_phys_base.patch merged to mainline kernel
some restructuring of driver patches to be more maintainable
better naming for prom.S/main.c, now prom_stage1.S, prom_stage2.c

0.0.3 -> 0.0.4

pre-kernel code (prom stage2) now located at beginning of memory
openeth driver fixed - thanks to ulrich gries
make tags
emulate a sun4c v0 prom for kernel
a bit more doc in readme
break out nonzero phys_base stuff in an own patch
support for writable ext2 rootfs (needs e2fsimage tool, eats lot of mem)
fs images are now compressed
'make run' starts tsim with -c tsim.do if present
'make lclean' makes clean in linux tree
-Os is broken for sparc, turn it off
fix compilation/linking for newer gcc/uclibc

0.0.2 -> 0.0.3

Makefile updates
new naming scheme (image.tsim, image.dsu, image.ram, image.asm)
patches ported to 2.6.4
added Changelog and README to distribution
main.c cleanup
dirty_hacks.patch not needed anymore

0.0.1 -> 0.0.2

static creation of initial context/page directory tables
'make make' calls make in linux subdir
change again to prom_con, vt console hack removed
removed unneccessary #ifdef in include/asm-sparc/head.h
leon.h whitespace/indent fixes
page.h whitespace fixes
cache enable configurable in prom.S
srmmu_nocache_calcsize tweak (calcs bad srmmu_nocache_npages for very low memory)

linux-2.5.75.diff -> 0.0.1

move leon_tmp out of kernel tree
activate btfixup
removed almost all unused/debug code
port the patch to 2.6.3
splitup patch into smaller ones
simplified pre-kernel boot code
support for standard /dev/console in leon_serial, devfs support

history

03/20/04 leon-linux-0.0.4.tar.gz
for linux 2.6.4
03/11/04 leon-linux-0.0.3.tar.gz
for linux 2.6.4
03/09/04 leon-linux-0.0.2.tar.gz
for linux 2.6.3
03/04/04 leon-linux-0.0.1.tar.gz
initial release (for linux 2.6.3)

if you have questions, problems, improvements, mail me.