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| author | Kartik Agaram <vc@akkartik.com> | 2020-12-21 00:04:38 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2020-12-21 00:04:38 -0800 |
| commit | 946dfe7ffb4bbf1e0f3f85b3560c9f9395b708e0 (patch) | |
| tree | 25d477f430e7e0c4313ffbad1a1cec13b9d10e5e /apps/boot.hex | |
| parent | 6ac16fd1ae275fb4042ab4aa85df3ccc86f3e615 (diff) | |
| download | mu-946dfe7ffb4bbf1e0f3f85b3560c9f9395b708e0.tar.gz | |
7370
Use a more realistically sized disk image. Now we can read the second sector.
Diffstat (limited to 'apps/boot.hex')
| -rw-r--r-- | apps/boot.hex | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/apps/boot.hex b/apps/boot.hex index a95c1de7..ec65898d 100644 --- a/apps/boot.hex +++ b/apps/boot.hex @@ -6,12 +6,15 @@ # If the initial load fails, it prints 'D' to the top-left of the screen and # halts. # -# To convert to a disk image: +# To convert to a disk image, first prepare a realistically sized disk image: +# dd if=/dev/zero of=disk.img count=20160 # 512-byte sectors, so 10MB +# Now fill in sectors: # ./bootstrap run apps/hex < apps/boot.hex > boot.bin +# dd if=boot.bin of=disk.img conv=notrunc # To run: -# qemu-system-i386 boot.bin +# qemu-system-i386 disk.img # Or: -# bochs -f apps/boot.bochsrc # boot.bochsrc loads boot.bin +# bochs -f apps/boot.bochsrc # boot.bochsrc loads disk.img # # Since we start out in 16-bit mode, we need instructions SubX doesn't # support. @@ -37,7 +40,7 @@ b2 80 # dl <- 80 # hdd 0 b5 00 # ch <- 0 # cylinder 0 b6 00 # dh <- 0 # track 0 - b1 01 # cl <- 1 # sector 0 (first sector, 1-based) + b1 02 # cl <- 2 # second sector, 1-based b0 01 # al <- 1 # number of sectors to read # address to write sectors to = es:bx = 0x7e00, contiguous with boot segment bb 00 00 # bx <- 0 |