[SeaBIOS] int 1589 test case?

[Sebastian Herbszt]

Kevin O'Connor wrote:
> On Sun, Jan 10, 2010 at 04:11:51PM +0100, Sebastian Herbszt wrote:
>> Kevin O'Connor wrote:
>> >Under bochs, with the above change, the screen doesn't hang, and the
>> >test program returns to real mode.  However, the system still hangs
>> >because it looks like bochs reset the f-segment.
>> 
>> Can you elaborate on "hangs". With Bochs cvs i end up back in FreeDOS
>> shell, the keyboard works and i can try to execute commands.
> 
> On qemu, the screen ceases to update.  It doesn't happen on Bochs.
> (Interestingly, I can see from the logs that irqs and disk accesses
> still work under qemu - it's just that the screen stops updating.)

Maybe try to call the vga bios.

>> If i try to execute commands after resume the bios freaks out:
>> 
>> 00206894578i[BIOS ] In resume (status=5)
>> 00219543399i[BIOS ] int13_harddisk: function 02, parameters out of range 0000/0000/0001!
> 
> The "int13_harddisk" message indicates to me that the f-segment was
> reset (SeaBIOS thinks the drive has zero sectors).
> 
>> If i change BX_RESET_HARDWARE to BX_RESET_SOFTWARE it works as expected.
> 
> If BX_RESET_SOFTWARE no longer resets the f-segment, that would make
> sense.

I think BX_RESET_SOFTWARE is like cpu #INIT.

- Sebastian