1. booting from tftp
a. install atftp, configure conf.d/atftp(Root mode = 777)
b. setting uboot.
bootcmd = tftpboot 0x7fc0 uImage ; bootm
2. NFSRoot
a. download full_cramfs from ARM office website
http://www.arm.com/products/os/linux_download.html
b. mount -t cramfs -o loop "filename" /mnt
c. copy "bin, dev, etc, lib, root, sbin, usr, var" to ARMRoot
d. creating "home, proc, opt, sys, tmp"
e. configure nfs server
/etc/exports: /home/armroot 192.169.77.0/24(rw, no_root_sqush, subtree_check)
f. setting uboot.
bootargs = root=/dev/nfs rw,iocharset=cp950 nfsroot=serverip:/home/armroot ip=localip(can be dhcp)
mem=128M console=ttyAMA0
3. developing driver
a. download kernel source and patch from above website.
b. build it.
P.S.
rebuild linux kernel --
http://www.arm.com/support/faqdev/14409.html
