Re: Simulator for x486
- From: "Helge Kruse" <spamtrap@xxxxxxxxxx>
- Date: Tue, 20 May 2008 21:03:31 +0200
"Ben Peddell" <spamtrap@xxxxxxxxxx> wrote in message news:g0ucsj$1fa0$1@xxxxxxxxxxxxxxxxxxxxxxx
I am working at a boot loader for a x486 CPU. The CPU starts from Flash in 8086 real mode initializes the GDT, jumps to protected mode and sets up the chip set, DRAM controller etc.
Is there any simulator where I can single step the opcodes out of the flash rom image? Host operating system ist Windows XP, Linux would be possible but harder to set up.
BOCHS <bochs.sourceforge.net>
Ben, thanks for reply. I found in chapter four of the Bochs manual
These are the minimum requirements for running an OS inside of Bochs:
a.. the Bochs executable
b.. the BIOS image (usually called BIOS-bochs-latest)
c.. the VGA BIOS image (e.g. VGABIOS-lgpl-latest or VGABIOS-elpin-2.40)
d.. at least one bootable media, either as disk image (floppy, hard disk or CD-ROM) or physical disk (floppy or CD-ROM)
Unfortunately I only have some bytes that should be fetched from the flash device. Are you sure you can convince Bochs to skip the VGA and the boot media? Can you give a hint?
Best regards,
Helge
.
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