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Format of AMI BIOS Flash ROM parameter block

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Offset Size Description

00h

32 BYTEs

ASCIZ description of the file's contents

20h

BYTE

Logical area type (see #00545)

21h

DWORD

logical area size (overall size of area)

25h

BYTE

flag: load from file:
FFh = yes
00h = no

26h

BYTE

flag: reboot after update:
FFh = yes
00h = no

27h

BYTE

flag: update entire image:
FFh = yes
00h = no

28h

24 BYTEs

ASCIZ logical area name (cooresponds to offset 20) "System BIOS", "Logo Data Area", etc.

40h

15 BYTEs

ASCIZ time stamp string: MM/DD/YY-HH:MM

4Fh

BYTE

checksum for this header (sum of all bytes except this one) if checksum would be 00h, 01h, or FFh, it is set to 2Ah

50h

DWORD

this file's starting address (offset in image)

54h

DWORD

size of image chunk in this file

58h

BYTE

logical area type - same as offset 20h

59h

BYTE

flag: last file in chain:
FFh = yes
00h = no

5Ah

6 BYTEs

ASCIZ signature "FLASH"

60h

16 BYTEs

ASCIZ filename of next file in chain

70h

16 BYTEs

ASCIZ BIOS reserved string (usually version #)

Note:

This block is identical in format to the 128-byte header on an AMI BIOS Update file.
For AX=DB00h, the following fields must be specified: 50h,54h,58h;
The fields at offset 20h and 5Ah should also be set if possible.
The fields at offsets 40h and 70h will be set on return, if available.

See Also:

#00546