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Add comments for introducing startup sequence for DUET boot disk. 

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8042 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
klu2 2009-04-09 06:16:52 +00:00
parent 6d931089df
commit c0e741ef23
1 changed files with 16 additions and 3 deletions
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19
DuetPkg/BootSector/bootsect.asm
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@ -9,9 +9,22 @@
;* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
;* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
;*
;* bootsect.asm
;*
;* Abstract:
;* bootsect.asm
;*
;* bootsect.asm is built as 16-bit binary file in 512 bytes and patched to disk/partition's
;* first section - boot sector.
;*
;* The startup sequence for DUET disk boot sector is:
;*
;* 1, LegacyBios check 0xAA55 signature at boot sectore offset 0x1FE to judget
;* whether disk/partition is bootable.
;* 2, LegacyBios will load boot sector to 0x7c00 in real mode, pass BPB data and
;* hand off control to 0x7c00 code.
;* 3, boot sector code simply parse FAT format in boot disk and find EfiLdr binary file
;* and EfiVar.bin if exists. For first boot, EfiVar.bin does not exist.
;* 4, boot sector load the first sector of EfiLdr binary which is start.com to
;* 0x2000:0x0000 address.
;* 5, boot sector handoff control to 0x2000:0x0000 for start.com binary.
;*
;------------------------------------------------------------------------------