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stage1: Improve compatibility of HDD bootsector

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This commit is contained in:
mintsuki 2022-07-13 20:17:34 +02:00
parent 82e62a9678
commit c50e02ec2e
1 changed files with 25 additions and 2 deletions
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27
stage1/hdd/bootsect.asm
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@ -8,8 +8,31 @@ start:
; Some BIOSes will do a funny and decide to overwrite bytes of code in ; Some BIOSes will do a funny and decide to overwrite bytes of code in
; the section where a FAT BPB would be, potentially overwriting ; the section where a FAT BPB would be, potentially overwriting
; bootsector code. ; bootsector code.
; Avoid that by filling the BPB area with 0s ; Avoid that by filling the BPB area with dummy values.
times 87 db 0 ; Some of the values have to be set to certain values in order
; to boot on even quirkier machines.
; Source: https://github.com/freebsd/freebsd-src/blob/82a21151cf1d7a3e9e95b9edbbf74ac10f386d6a/stand/i386/boot2/boot1.S
.bpb:
times 3-($-$$) db 0
.bpb_oem_id: db "LIMINE "
.bpb_sector_size: dw 512
.bpb_sects_per_cluster: db 0
.bpb_reserved_sects: dw 0
.bpb_fat_count: db 0
.bpb_root_dir_entries: dw 0
.bpb_sector_count: dw 0
.bpb_media_type: db 0
.bpb_sects_per_fat: dw 0
.bpb_sects_per_track: dw 18
.bpb_heads_count: dw 2
.bpb_hidden_sects: dd 0
.bpb_sector_count_big: dd 0
.bpb_drive_num: db 0
.bpb_reserved: db 0
.bpb_signature: db 0
.bpb_volume_id: dd 0
.bpb_volume_label: db "LIMINE "
.bpb_filesystem_type: times 8 db 0
.skip_bpb: .skip_bpb:
cli cli