Assuming an ubuntu setup and with Pengutronix Linux kernel patches for the mini2440.
RootFS creation using debian multistrap. See simple_config to create a simple
multistrap configuration.
Use tar with the following options --> -cpjvf --numeric-owner
-c --> Create
-p --> Preserve permissions
-j --> bz2.
-v --> verbose
-f --> use file archive ie. the name of the file.
tar -cpjvf <filename.tar.bz2> . --numeric-owner
Extraction is the same. Make sure you are using sudo as the file permissions usually
will have root user permissions and the permissions are preserved.
Creation of a Emdebian rootfs.
1
2
3
4
| sudo debootstrap --foreign --arch armel <debian_release_codename> <rootfs_directory> http://ftp.debian.org/debian/ Do -> cp /usr/bin/qemu-static-arm <rootfs_directory>/usr/bin
Get a root environment. Do -> sudo -i
To do a second stage install. Do -> LC_ALL=C LANGUAGE=C LANG=C chroot debian_armel_wheezy /debootstrap/debootstrap --second-stage
To trigger post install scripts. Do -> LC_ALL=C LANGUAGE=C LANG=C chroot emdebian_rootfs_wheezy_test dpkg --configure -a
|
Reference http://wiki.debian.org/EmDebian/CrossDebootstrap#QEMU.2Fdebootstrap_approach
Copy fstab,udev.conf,udev.rules,ts.conf files from pengutronix to the rootfs sdcard.
Reference inittab
1
2
3
4
5
6
7
8
9
10
11
12
| id:5:initdefault:
T1::sysinit:/bin/mount -t proc proc /proc
T2::sysinit:/bin/mount -o remount,rw /
T3::sysinit:/bin/mkdir -p /dev/pts
T4::sysinit:/bin/hostname -F /etc/hostname
T5::sysinit:/etc/init.d/rcS
T6::sysinit:/bin/mount -a
#T7::sysinit:/bin/mount -t sysfs sys /sys
T0::respawn:/sbin/getty -L ttySAC0 38400 vt100
|
Reference passwd
1
2
3
| root::0:0:root:/root:/bin/sh
bin:x:1:1:bin:/dev/null:/bin/false
nobody:x:99:99:Unprivileged user:/dev/null:/bin/false
|
Reference group
1
2
3
4
5
6
7
8
9
10
11
12
13
14
| root:x:0
bin:x:1
nogroup:x:99
floppy:x:1000:
cdrom:x:1001:
tape:x:1002:
lp:x:1003:
tty:x:1004:
video:x:1005:
kmem:x:1006:
audio:x:1007:
disk:x:1008:
dialout:x:1009:
crontab:x:1010:
|
Reference fstab
1
2
3
4
5
6
7
8
9
10
11
12
| # UNCONFIGURED FSTAB FOR BASE SYSTEM
devpts /dev/pts devpts defaults 0 0
none /tmp tmpfs defaults,mode=1777,uid=0,gid=0 0 0
none /sys sysfs defaults 0 0
debugfs /sys/kernel/debug debugfs defaults 0 0
usbfs /proc/bus/usb usbfs devgid=14,devmode=0660 0 0
none /var/log tmpfs defaults,mode=0755,uid=0,gid=0 0 0
none /run tmpfs defaults,mode=0755,uid=0,gid=0 0 0
none /run/lock tmpfs defaults,mode=0755,uid=0,gid=0 0 0
none /var/tmp tmpfs defaults,mode=1777,uid=0,gid=0 0 0
|
/etc/securetty
Add ttySAC0 entry at the end of securetty file.
Copy relevant files like udev rules from pengutronix folders.
Kernel Compilation
Get the kernel from kernel.org. If the patch from pengutronix is 3.9.1(i.e. patch.3.9.1.bz2) download the
3.9.0 kernel and the patch will patch the version to 3.9.1. Also if the patches directory shows 3.9 then
download the 3.9.0 kernel.
Using quilt to apply the 'series' patch.
Create a sym link called patches pointing to
../OSELAS.BSP-Pengutronix-Mini2440/configs/platform-friendlyarm-mini2440/patches/linux-3.9/ in the
linux directory.
Create a sym link called series pointing to
../OSELAS.BSP-Pengutronix-Mini2440/configs/platform-friendlyarm-mini2440/patches/linux-3.9/series in
the linux directory.
To apply the series of patches do -> quilt push -av
Copy kernelconfig to the defconfig
Eg:
1
| cp ../OSELAS.BSP-Pengutronix-Mini2440/configs/platform-friendlyarm-mini2440/kernelconfig-3.9 arch/arm/configs/mini2440_defconfig
|
Kernel compilation:
1
2
| CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm make mini2440_defconfig
CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm make menuconfig
|
Kernel config
Device Drivers->Graphics Support->Bootup logo check.
-> Direct Rendering Manager.
-> Lowlevel video output switch controls.
->Console display driver support -> Framebuffer console support.
Optional
Framebuffer console rotation.
Mini 4x6 font. (For smaller font).
Device Drivers->Graphics Support->Support for framebuffer devices.
-> S3C2410 LCD framebuffer support.
-> S3C2410 lcd debug messages.
Device Drivers->Character Devices->Enable TTY.
-> Virtual Terminal.
File Systems-> Enable ext2,ext3
Network support -> Networking support -> IP: BOOTP support.
IP: RARP support.
1
2
3
| CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm INSTALL_MOD_PATH=/mnt/arm make
CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm INSTALL_MOD_PATH=/mnt/arm make uImage
CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm INSTALL_MOD_PATH=/mnt/arm make modules_install
|
uboot options:
1
2
| bootargs=mini2440=5tb rootfstype=ext3 root=/dev/mmcblk0p2 rw bootdelay=rootwait ip=dhcp console=tty0 --> For lcd console output.
bootargs=mini2440=5tb rootfstype=ext3 root=/dev/mmcblk0p2 rw bootdelay=rootwait ip=dhcp console=ttySAC0 --> For serial output.
|
Bootcmd for sdcard boot:
1
| bootcmd=mmcinit ; ext2load mmc 0:1 0x31000000 uImage ; bootm 0x31000000
|
Bootcmd for tftpboot:
1
| bootcmd=tftpboot 0x31000000 192.168.1.101:uImage ; bootm 0x31000000
|
nfs setup
1
2
3
| mkdir /export
mkdir /export/fs
mkdir /export/kernel
|
/etc/exports
1
2
3
| /export 192.168.1.0/24(rw,fsid=0,insecure,no_subtree_check,async)
/export/fs 192.168.1.0/24(rw,fsid=0,insecure,no_subtree_check,async,no_root_squash)
/export/kernel 192.68.1.0/24(rw,fsid=0,insecure,no_subtree_check,async)
|
Bootcmd for nfs
1
2
3
4
5
| setenv bootcmd nfs 0x31000000 192.168.1.x:/nfs/rootfs/boot/uImage \; bootm
setenv bootargs console=ttySAC0,115200 root=/dev/nfs nfsroot\=192.168.1.x:/nfs/rootfs rw ip=dhcp mini2440=5tb
|
\----> * Do not use environment variable *
|
NFS configuration which worked:
1
| /nfs/rootfs 192.168.1.0/24(rw,fsid=0,insecure,no_subtree_check,async,no_root_squash)
|
For ERROR cannot umount add mini2440 to /etc/hosts in your host.
For earlyprintk messages. Enable in the kernel. Also put a
'earlyprintk'(without quotes) in bootargs
For eg:
1
| setenv bootargs console=ttySAC0,115200 root=/dev/nfs nfsroot\=192.168.1.x:/nfs/rootfs rw ip=dhcp mini2440=5tb earlyprintk
|
