diff options
| -rw-r--r-- | apps/boot.bochsrc | 4 | ||||
| -rw-r--r-- | apps/boot.hex | 11 |
2 files changed, 8 insertions, 7 deletions
diff --git a/apps/boot.bochsrc b/apps/boot.bochsrc index 6643905c..521e22d9 100644 --- a/apps/boot.bochsrc +++ b/apps/boot.bochsrc @@ -1,8 +1,6 @@ # Configuration for the Bochs x86 CPU emulator to run the output of apps/boot.hex # See apps/boot.hex for more details. -# You'll probably want to adjust the disk geometry below when you update -# boot.hex and alter the size of boot.bin. -ata0-master: type=disk, path="boot.bin", mode=flat, cylinders=1, heads=1, spt=1 +ata0-master: type=disk, path="disk.img", mode=flat, cylinders=20, heads=16, spt=63 # 10MB, 512 bytes per sector boot: disk log: - 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 |