Nabendu's Blog

While reading about Sino-japan war.I found Japan was almost winning.Suddenly it attacked Perl Harbor.I could not find the motive.What Google search gave a result with details explanation. http://wiki.answers.com/Q/Why_did_the_Japanese_attack_Pearl_Harbor

This the following minimum boot sequence  1) Bootloader loads the Kernel image to Ram      The image may be compressed or uncompressed.Uboot uses a special header in added        to the kernel image and make it as uImage. Using  mkimage we can make the image zImage/vmLinux 2) Ramdisk loaded in the memory, bootloader do that. 3) Control is given to kernel ,it also provides kernel arguments/command line options.Also bootlader set ramdisk as rootfs. Initial Rootfs filesystem may be of ext2 or minix format.   initramfs is the file can be unpacked by kerne l of following formats . . gzip ,  bzip2 ,  LZMA ,  XZ  and  LZO . 3) Then "linuxrc" ran from initial ramdisk. 4) The root device is changed to that specified in the kernel parameter. 5) The init program  /etc/init  is run which will perform the user configurable boot sequence. if rdinit is used then specified binary is called. ...

I was confused between  arm-none-linux-gnueabi and arm-none-eabi .I didn't know where to use what. The gcc naming convention is like as below arch-vendor-(os-)-eabi so for  arm-none-linux-gnueabi is meant for the compilation to elf which uses linux. and  arm-none-eabi is meant for the compilation of the codes which will run on bare metal arm core. The difference is that they use library accordingly to compile the source codes. 

I recently tried to run Xubuntu 12.04 on virtualbox 1.2.0.It was working fine.Then due to some bug in my head :) tried to upgrade virtualbox to VirtualBox-4.2.0_RC3 from here . Now without uninstalling the previous version I installed it.It created problem.While running any Vms after installing extension pack it gave error [ " failed to load vmmr0.r0 (verr_ldr_mismatch_native)" ]. This issue is intially I couldn't solve.Later I solved the issue as following. Remove virtualBox ,remove folders from Program Files then removing "C:\Users\USERNAME\AppData\Local\VirtualStore\Program Files\Oracle\VirtualBox" {Need administrative privilege} Now install VBox freshly and import the virtual image projects/Disks.

This Makefile tutorial by Alex is small but very useful. http://www.cprogramming.com/tutorial/makefiles_continued.html