mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-27 20:58:07 +11:00
56 lines
1.7 KiB
Plaintext
56 lines
1.7 KiB
Plaintext
|
# PC/AT
|
||
|
|
|
||
|
|
PC-compatible machines need no introduction. They are one of the
|
||
|
|
most popular machines of all time. Collapse OS has a 8086
|
||
|
|
assembler and has boot code allowing it to run on a
|
||
|
|
PC/AT-compatible machine, using BIOS interrupts in real mode.
|
||
|
|
Collapse OS always runs in real mode.
|
||
|
|
|
||
|
|
In this recipe, we will compile Collapse OS and write it to a
|
||
|
|
USB drive that is bootable on a modern PC-compatible machine.
|
||
|
|
|
||
|
|
# Gathering parts
|
||
|
|
|
||
|
|
* A modern PC-compatible machine that can boot from a USB drive.
|
||
|
|
* A USB drive
|
||
|
|
|
||
|
|
# Build the binary
|
||
|
|
|
||
|
|
Running "make" in /arch/8086/pcat will yield:
|
||
|
|
|
||
|
|
* mbr.bin: a 512 byte binary that goes at the beginning of the
|
||
|
|
disk
|
||
|
|
* os.bin: 8086 Collapse OS binary
|
||
|
|
* disk.bin: a concatenation of the above, with "blkfs" appended
|
||
|
|
to it starting at 0x2000.
|
||
|
|
|
||
|
|
disk.bin is what goes on the USB drive.
|
||
|
|
|
||
|
|
This binary has BLK and AT-XY support, which means you have disk
|
||
|
|
I/Os and can run VE.
|
||
|
|
|
||
|
|
# Emulation
|
||
|
|
|
||
|
|
You can run the built binary in Collapse OS' 8086 emulator using
|
||
|
|
"make emul".
|
||
|
|
|
||
|
|
The 8086 emulator is barbone. If you prefer to use it on a more
|
||
|
|
realistic setting, use QEMU. The command is:
|
||
|
|
|
||
|
|
qemu-system-i386 -drive file=disk.bin,if=floppy,format=raw
|
||
|
|
|
||
|
|
# Running on a modern PC
|
||
|
|
|
||
|
|
First, copy disk.bin onto your USB drive. For example, on an
|
||
|
|
OpenBSD machine, it could look like:
|
||
|
|
|
||
|
|
doas dd if=disk.bin of=/dev/sd1c
|
||
|
|
|
||
|
|
Your USB drive is now BIOS-bootable. Boot your computer and
|
||
|
|
enter your BIOS setup to make sure that "legacy boot" (non-EFI
|
||
|
|
boot, that is, BIOS boot) is enabled. Configure your boot device
|
||
|
|
priority to ensure that the USB drive has a chance to boot.
|
||
|
|
|
||
|
|
Reboot, you have Collapse OS. Boot is of course instantaneous
|
||
|
|
(we're not used to this with modern software...).
|