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GL815E Endura Motherboard Product Manual
Page 42 of 51
A.7. BIOS Organization
The BIOS ROM is a 4Mbit device containing eight symmetrical 64KB blocks. The diagram below
shows how the ROM is used to store code and control information. The addresses shown refer to
the ROM image at the top of the 4GB-address space. Note that the system BIOS segment is
compressed in this image. When the BIOS runs, the code is uncompressed in real-time and the
resulting code and data image is found at physical address 0E0000h through 0FFFFFh. The
diagram includes the map for products that contain an 8Mbit ROM where fitted although this is not
fitted as standard.
40KB Boot logo
8KB Microcode Updates
8KB CMOS defaults
8KB System Data Block
64KB ESCD
320KB BIOS
- System, Video & LAN
(compressed code)
64KB Bootblock code
& motherboard data
64KB Customisation
512KB Embedded binaries
0FFFF0000h
0FFFE0000h
0FFFD0000h
0FFFC0000h
0FFFB0000h
0FFFA0000h
0FFF90000h
0FFF80000h
0FFF70000h
0FFF60000h
0FFF50000h
0FFF40000h
0FFF30000h
0FFF20000h
0FFF10000h
0FFF00000h
Available only with 8Mbit ROM
2KB Microcode slot 0
2KB Microcode slot 1
2KB Microcode slot 3
2KB Microcode slot 2