using int 13h to access DOC

using int 13h to access DOC

[Matt Hortman]

Hi guys...

Shoot this down: Since the M-Sys firmware in the DOC simply installs
an int 13h handler, why not use it to access the DOC using "bios"
calls.  I realize that the kernel probably overwrites that handler but
that could be fixed.  I don't know, however, about using a real-mode
interrupt from a device driver.  It seems too simple to work.  What
have I overlooked?

thanks,

-Matt



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Re: using int 13h to access DOC

[Ollie Lho]

Matt Hortman wrote:
> 
> Hi guys...
> 
> Shoot this down: Since the M-Sys firmware in the DOC simply installs
> an int 13h handler, why not use it to access the DOC using "bios"
> calls.  I realize that the kernel probably overwrites that handler but
> that could be fixed.  I don't know, however, about using a real-mode
> interrupt from a device driver.  It seems too simple to work.  What
> have I overlooked?
> 

Why ?? We have GPL'd driver for both DoC 2000 and DoC Millennium now.

Ollie


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Re: using int 13h to access DOC

[David Woodhouse]

On Wed, 19 Jul 2000, Matt Hortman wrote:

> Shoot this down: Since the M-Sys firmware in the DOC simply installs
> an int 13h handler, why not use it to access the DOC using "bios"
> calls.  I realize that the kernel probably overwrites that handler but
> that could be fixed.  I don't know, however, about using a real-mode
> interrupt from a device driver.  It seems too simple to work.  What
> have I overlooked?

It's complex and unreliable. You can't trust BIOSen and the M-Systems code
requires a _lot_ of low memory to be untouched.

There was, however, a patch for the 1.1 kernel which did this, I
believe. It is theoretically possible. Better just to complete the
existing GPL'd driver that we have though - it's probably easier.

Note - with the new 2.02 boot protocol for the Linux kernel, we should be
able to boot happily from DiskOnChip even with the huge EBDA that its
firmware requires. New bootloaders and 2.4 kernels should 'just work'
according to hpa. There's a patch available for the 2.2 kernel to support
the 2.02 protocol too.

--
dwmw2



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Re: using int 13h to access DOC

[Kira Brown]

On Thu, 20 Jul 2000, David Woodhouse wrote:

> Note - with the new 2.02 boot protocol for the Linux kernel, we should be
> able to boot happily from DiskOnChip even with the huge EBDA that its
> firmware requires. New bootloaders and 2.4 kernels should 'just work'
> according to hpa. There's a patch available for the 2.2 kernel to support
> the 2.02 protocol too.

Available where?  I'd like to get rid of our annoying FreeDOS bootloader.

kira.



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Re: using int 13h to access DOC

[David Woodhouse]

On Fri, 21 Jul 2000, Kira Brown wrote:

> On Thu, 20 Jul 2000, David Woodhouse wrote:
> > according to hpa. There's a patch available for the 2.2 kernel to support
> > the 2.02 protocol too.
> 
> Available where?  I'd like to get rid of our annoying FreeDOS bootloader.

Dunno. Ask hpa.

--
dwmw2



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Re: using int 13h to access DOC

[Stuart Lynne]

In article <Pine.LNX.4.21.0007211625450.22633-100000@alpha1.cygnus.co.uk>,
David Woodhouse <dwmw2@alpha1.cygnus.co.uk> wrote:
>On Fri, 21 Jul 2000, Kira Brown wrote:
>
>> On Thu, 20 Jul 2000, David Woodhouse wrote:
>> > according to hpa. There's a patch available for the 2.2 kernel to support
>> > the 2.02 protocol too.
>> 
>> Available where?  I'd like to get rid of our annoying FreeDOS bootloader.
>
>Dunno. Ask hpa.

 http://www.kernel.org/pub/linux/kernel/people/hpa/new-boot-2.2.17-pre9.diff.gz


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