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What is the difference between these two loading schemas?

  1. PXE from BIOS.
  2. PXE from EFI.

I know that firmware passes control to NIC program which is stored in the NIC ROM. This program gives IP address over BOOTP and at least a path to the loader. This loader loads over TFTP into the NIC's RAM and begins executing. Then the loader (syslinux, grub ...) loads kernel and initrd over TFTP/HTTP/FTP into the host RAM and passes control to kernel.

Why I must have two different loader versions (BIOS version and EFI version)?

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I thought that loaders that have been retrieved by NIC firmware are executed by the NIC controller, but that's wrong. This loader is executed by BIOS or EFI. BIOS is 16-bit environment, EFI is 32/64-bit environment. Thus, loader must be compatible with execution environment. Thanks for link Managing EFI Boot Loaders for Linux

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