uClinux porting HOWTO
Board specific configuration:
uclinux/Makefile
The toplevel Makefile is modified slightly to incorporate the changes in the building of the romfs image. The uClinux Make process proceeds as follows:
subdirs: User libraries (uclinux/lib/) are built, followed by selected user applications (uclinux/user).
romfs: The user applications are installed in the romfs directory (uclinux/romfs).
modules: Linux kernel modules are compiled.
modules_install: The compiled kernel modules are copied to the romfs directory (uclinux/romfs/lib/modules/).
image: The romfs image is generated at (uclinux/linux-2.4.x/romfs.o) from the romfs directory.
linux: The static components of the linux kernel are compiled to create the linux elf image (uclinux/linux-2.4.x/linux). The romfs image is included in the linux elf image, at the location specified by the linker script.
images: The final ARM7 binary is created.
...
...
ifeq (.config,$(wildcard .config))
include .config
all: subdirs romfs modules modules_install image linux images
else
all: config_error
endif
...
...
...
#
# normal make targets
#
.PHONY: romfs
romfs:
for dir in $(DIRS) ; do [ ! -d $$dir ] || $(MAKEARCH) -C $$dir romfs || exit 1 ; done
-find $(ROMFSDIR)/. -name CVS | xargs -r rm -rf
.PHONY: image
image:
[ -d $(IMAGEDIR) ] || mkdir $(IMAGEDIR)
$(MAKEARCH) -C $(VENDDIR) image
.PHONY: images
images:
[ -d $(IMAGEDIR) ] || mkdir $(IMAGEDIR)
$(MAKEARCH) -C $(VENDDIR) images
...
...
...
.PHONY: subdirs
subdirs:
for dir in $(DIRS) ; do [ ! -d $$dir ] || $(MAKEARCH_KERNEL) -C $$dir || exit 1 ; done
dep:
@if [ ! -f $(LINUXDIR)/.config ] ; then \
echo "ERROR: you need to do a 'make config' first" ; \
exit 1 ; \
fi
$(MAKEARCH_KERNEL) -C $(LINUXDIR) dep
...
...
...
uclinux/vendors/ACME/SOHO-B0X/Makefile
This is the vendor specific Makefile used to build the rom filesystem structure, generate the romfs image and create the linux binary.
romfs: The directory structure for the rom filesystem is created here. ROMFS_DIRS specifies the directories that are to be created, and DEVICES specifies the device files for various device drivers. The device files are of the format: DEVICE_NAME,character/block device,major number,minor number. Additionally a number of symbolic links are created and essential files copied to their respective locations in the romfs directory.
image: The romfs binary is created using the utilities genromfs and arm-elf-ld. The three commented commands concatenate the romfs binary at the end of the linux binary instead of within it.
images: The linux binary is created using arm-elf-ld and copied to the tftp download location.
# Makefile -- Build instructions for ACME/SOHO-B0X
#
ROMFSIMG = $(IMAGEDIR)/romfs.img
IMAGE = $(IMAGEDIR)/image.bin
ELFIMAGE = $(IMAGEDIR)/image.elf
ROMFS_DIRS = bin dev etc home lib mnt proc usr var
DEVICES = \
tty,c,5,0 console,c,5,1 cua0,c,5,64 \
cua1,c,5,65 \
\
mem,c,1,1 kmem,c,1,2 null,c,1,3 \
zero,c,1,5 random,c,1,8 urandom,c,1,9 \
\
ram0,b,1,0 ram1,b,1,1 \
\
ptyp0,c,2,0 ptyp1,c,2,1 ptyp2,c,2,2 \
ptyp3,c,2,3 ptyp4,c,2,4 ptyp5,c,2,5 \
ptyp6,c,2,6 ptyp7,c,2,7 ptyp8,c,2,8 \
ptyp9,c,2,9 ptypa,c,2,10 ptypb,c,2,11 \
ptypc,c,2,12 ptypd,c,2,13 ptype,c,2,14 \
ptypf,c,2,15 \
\
mtd0,c,90,0 mtd1,c,90,2 mtd2,c,90,4 \
mtd3,c,90,6 mtd4,c,90,8 mtd5,c,90,10 \
mtd6,c,90,12 mtd7,c,90,14 \
\
mtdblock0,b,31,0 mtdblock1,b,31,1 mtdblock2,b,31,2 \
mtdblock3,b,31,3 mtdblock4,b,31,4 mtdblock5,b,31,5 \
mtdblock6,b,31,6 mtdblock7,b,31,7 \
\
rom0,b,31,0 rom1,b,31,1 rom2,b,31,2 \
rom3,b,31,3 rom4,b,31,4 rom5,b,31,5 \
rom6,b,31,6 rom7,b,31,7 rom8,b,31,8 \
rom9,b,31,9 \
\
tty0,c,4,0 tty1,c,4,1 tty2,c,4,2 \
tty3,c,4,3 ttyS0,c,4,64 ttyS1,c,4,65 \
\
ttyp0,c,3,0 ttyp1,c,3,1 ttyp2,c,3,2 \
ttyp3,c,3,3 ttyp4,c,3,4 ttyp5,c,3,5 \
ttyp6,c,3,6 ttyp7,c,3,7 ttyp8,c,3,8 \
ttyp9,c,3,9 ttypa,c,3,10 ttypb,c,3,11 \
ttypc,c,3,12 ttypd,c,3,13 ttype,c,3,14 \
ttypf,c,3,15
clean:
romfs:
[ -d $(ROMFSDIR)/$$i ] || mkdir -p $(ROMFSDIR)
for i in $(ROMFS_DIRS); do \
[ -d $(ROMFSDIR)/$$i ] || mkdir -p $(ROMFSDIR)/$$i; \
done
for i in $(DEVICES); do \
touch $(ROMFSDIR)/dev/@$$i; \
done
$(ROMFSINST) -s /var/tmp /tmp
$(ROMFSINST) -s /bin /sbin
$(ROMFSINST) /etc/rc
$(ROMFSINST) /etc/inittab
$(ROMFSINST) ../../Generic/romfs/etc/services /etc/services
case "$(LINUXDIR)" in \
*2.4.*) ;; \
*) echo "ttyS0:linux:/bin/sh" >> $(ROMFSDIR)/etc/inittab ;; \
esac
$(ROMFSINST) /etc/motd
$(ROMFSINST) /etc/passwd
echo "$(VERSIONSTR) -- " `date` > $(ROMFSDIR)/etc/version
image:
[ -d $(IMAGEDIR) ] || mkdir -p $(IMAGEDIR)
genromfs -v -V "ROMdisk" -f $(ROMFSIMG) -d $(ROMFSDIR)
arm-elf-ld -r -o $(ROOTDIR)/$(LINUXDIR)/romfs.o -b binary $(ROMFSIMG)
# $(CROSS_COMPILE)objcopy -O binary --remove-section=.romvec \
--remove-section=.text --remove-section=.ramvec \
--remove-section=.init \
--remove-section=.bss --remove-section=.eram \
$(ROOTDIR)/$(LINUXDIR)/linux $(IMAGEDIR)/linux.data
# $(CROSS_COMPILE)objcopy -O binary --remove-section=.ramvec \
--remove-section=.bss --remove-section=.data \
--remove-section=.eram \
--set-section-flags=.romvec=CONTENTS,ALLOC,LOAD,READONLY,CODE \
$(ROOTDIR)/$(LINUXDIR)/linux $(IMAGEDIR)/linux.text
# cat $(IMAGEDIR)/linux.text $(IMAGEDIR)/linux.data $(ROMFSIMG) > $(IMAGE)
images:
arm-elf-objcopy -O binary -R .note -R .comment -S $(ROOTDIR)/$(LINUXDIR)/linux $(IMAGE)
cp $(IMAGE) /tftpboot/linux_bootram.bin
uclinux/vendors/ACME/SOHO-B0X/rc
The resource configuration script is executed upon system startup. The expand utility creates a read-write RAM filesystem and mounts it on /var. The network can be setup using the dynamic host configuration protocol. Finally, the system startup screen is printed.
/bin/expand /etc/ramfs.img /dev/ram0
mount -t ext2 /dev/ram0 /var
mkdir /var/config
mkdir /var/tmp
mkdir /var/lock
mount -t proc proc /proc
#ifconfig lo 127.0.0.1
#route add -net 127.0.0.0 netmask 255.255.255.0 lo
#ifconfig eth0 10.151.10.12 netmask 255.255.0.0
#route add -net 10.151.10.12 netmask 255.255.0.0 eth0
#dhcpcd -d -p -a eth0 &
cat /etc/motd
uclinux/vendors/ACME/SOHO-B0X/motd
Contents of this file are printed upon system startup.
____ _ _
/ __| ||_|
_ _| | | | _ ____ _ _ _ _
| | | | | | || | _ \| | | |\ \/ /
| |_| | |__| || | | | | |_| |/ \
| ___\____|_||_|_| |_|\____|\_/\_/
| |
|_|
For further information check:
http://www.uclinux.org/
uclinux/vendors/ACME/SOHO-B0X/inittab
Initialization script.
#boa:unknown:/bin/boa
uclinux/vendors/ACME/SOHO-B0X/passwd
User information for authenticated logins if required.
uclinux/vendors/ACME/SOHO-B0X/config.arch
Architecture configuration options for the build process.
#####################################################################
# Vendor specific settings
#
CONSOLE_BAUD_RATE = 115200
####################################################################
CPUFLAGS :=
VENDOR_CFLAGS :=
DISABLE_XIP := 1
DISABLE_MOVE_RODATA := 1 # until we get a toolchain release
# LOPT := -O2 # library is alway 02
# UOPT := -Os # user apps are always Os
####################################################################
include $(ROOTDIR)/vendors/config/armnommu/config.arch
####################################################################
uclinux/vendors/ACME/SOHO-B0X/config.linux-2.4.x
Factory default configuration for linux; copied from uclinux/linux-2.4.x/.config.
uclinux/vendors/ACME/SOHO-B0X/config.uClibc
Factory default configuration for the uClibc library; copied from uclinux/uClibc/.config.
uclinux/vendors/ACME/SOHO-B0X/config.vendor-2.4.x
Factory default configuration for the selection of user applications; copied from uclinux/config/.config.
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