I stilled didn't succeed to get the userland up
and running with uClinux-2.4.x on uCsimm conveniently :-(
But i did some progresses and may be smarter people
than me can master it based on the work i have done ...
Currently, the kernel boots and starts a simple
user space demo program (/sbin/init) that plays around
with the LEDs on the EVA-board. Even a printf() crashes the
machine with an illegal instruction ... seems that
uClibc is somewhat broken on uCsimm or i just didn't
found out the magic compiling options.
I have done a patch-set for uClibc, uClinux-2.4.x
and userland (snapshots from 200301, two days ago):
A hopefully convenient .config for the kernel is also included.
The patch-set can be downloaded from
For compiling, you will have to download David McCullough's
elf tool-chain: http://www.uclinux.org/pub/uClinux/m68k-elf-tools/
(BTW: don't forget to delete dev/console and create a
new one with "mknod console c 5 1")
Those who are interessted can download a precompiled image from
The image is located at 0x600000, means you will need to
have flashed a "himemloader"-enhanced image.
I added an arch/m68knommu/platforms/68EZ328 directory.
The files in it were taken from the recent 68328
directory and mixed with files taken from
kernel 2.0.38pre7 (68EZ328).
In drivers/char/68328serial.h i had to add:
to get some definitions that are needed later
in the header file.
Additionaly, i did two quickhacks in init/main.c:
In start_kernel() i had to disable console_init(),
otherwise the machine hangs during calibration
Just before mount_root(), i had to add
ROOT_DEV = MKDEV(BLKMEM_MAJOR,0);
because the already correct setup is overwritten
somewhere during the boot process.
There are still "kmem_create: Forcing size word
alignment" messages during boot time. I didn't
found an easy way to get rid of them ...
uClibc doesn't compile out of the box. I had to change
line 154 to
@echo "#define __linux__ 1" >> uClibc_config.h
@echo "#define __linux_ 1" >> uClibc_config.h
To make use of the newly created uClib, I had to
change several Makefiles in the userland directory
(here renamed "src" to be complient to the structure
generated by "buildenv")
Added uClibc include and library path, i.e.
TOPDIR = /home/kuhn/devel/uclinux/projects/uCsimm-2.4
INCDIR = -I$(TOPDIR)/uClibc/include -I$(TOPDIR)/linux/include
LIBDIR = -L$(TOPDIR)/uClibc
Switching to elf:
CROSS = m68k-elf-
Added include path to CFLAGS and create an LDFLAGS entry
CFLAGS = -O2 -fomit-frame-pointer $(INCDIR)
LDFLAGS = -Wl,-elf2flt -lc $(LIBDIR)
The Makefile for every application has to be changed
to make use of the LDFLAGS, i.e. in
$(CC) -o $@ $(OBJ) $(CFLAGS) $(LDFLAGS)
I have recognized that the order of -o $@ $(OBJ)
and $(LDFLAGS) is important. If mixing them
up, it can be possible that compiling is
aborted with unresolved symbols ...
So far ...
maybe somebody can do somwthing with this information ...
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This archive was generated by hypermail 2b30 : Sun Apr 07 2002 - 00:01:42 EST