CREATE GRUB THEME MAC OS
CREATE GRUB THEME INSTALL
CREATE GRUB THEME CODE

CREATE GRUB THEME CODE

This is job for boot code in GRUB.ДЄctually core.img file is generated when GRUB is installed. This block contain many address of blocks, to iterate these address and load blocks then the complete core.img (around 32 KB) comes into memory. The first block of core.img is called diskboot.img for HDDВ or cdboot.img for cd-rom or pxeboot.img for network boot. so they read directly one sector (block) where core.img file is located. Because that time they cant understand the file system. so MBR contain small code called boot.imgand its capable to read first block of core.img file from any partition (logical volume too) before partition is mounted. In 446 bytes in MBR is not enough to put entire grub code. GRUB2 comes as a default boot loader in manyВ LinuxВ like Ubuntu 9В onward's. Its capable to load the OSВ even thoughВ its installed logical volume.Its capable to boot ISOВ LinuxВ directly.GRUB2 acts as a mini OS, we can mount manyВ file-system.Its modular based, so we can load any module when its needed.

GRUB2 is completely rewritten from original GRUB.

We already seen forВ LinuxВ there are many boot loader.В nowВ let see why GRUB2 is more powerful than others. Boot loader get overhead toВ interpretВ theВ extended partitionВ table and get the entry then load the OS. The reason is if OS is installed primary partition then boot loaders easily can find the partition, because MBR contain primary partition entry.Д«ut when u installed in logical partition then that partition entry is residingВ extendedВ partition table. because that boot code can't capable to access the logical volume.

CREATE GRUB THEME INSTALL

They can't boot the OS, if OS is installed in logical partition.В that'sВ why windows OS we must install in primary partition. Here one limitation for some boot loaders like Windows boot-loader. GRUB Boot loader -> Windows Boot loader -> Load Windows Kernel Its holds the partition entries and boot code.ДЇollowing MBR block, the actual partition are begin. Its located in first sector of HDD, CD, other device. Master Boot Record (MBR) is one block with 512 bytes.

CREATE GRUB THEME MAC OS

If want use theseВ boot loaderВ to boot other OS (Linux, Mac OS X) then we need to tweak using 3rd party tools like easyBCDДЇor Linux Operating System uses manyВ differentВ boot loaders as distro choice like ISOLINUX, LILO, GRUB TheseВ boot loadersВ areВ specificallyВ designed to load Windows OS. MicrosoftВ WindowsВ up toВ Windows XP comes with NTLDR boot loaderДЇrom Windows VistaВ onwardВ they use BOOTMGR as aВ boot loader.

EachВ OperatingВ System shipped withВ boot loader Bios initialize theВ peripheralsВ and check the booting order of the device then select the highest priority of the device execute the code stored in MBR of that device. When PC is switched on the system controls goes to BIOS. here i ll share what isВ boot loader?, how grub2 boot loader is works? and how we canВ customize? and how we apply the themes?Д«oot loader is small code reside in MBR to load theВ kernel(core) of the operating system and give the control to OS. recently i surfing theВ LinuxВ base concepts then i came to know about grub2. In this post we will discuss the GRUB2 (GRand UnifiedВ Boot-loader) inВ Linux.

Create grub theme