[ECOS] i386 flopy load problem.

[ECOS] i386 flopy load problem.

[Leandro Vieira]

Hi,

The current code for loading from the floppy won't work in many case. It
will be subject to what i call the "buffer cross 64k boundary problem": The
bios function can't handle a buffer that cross a 64k boundary (This is also
refered as "DMA access across 64k boundary" in some docs)

The current code load track by track, and so there is a good chance to cross
a 64K boundary during a track load, if the image size is big enough.

The only way to avoid the problem is to load one sector at a time, and to
align _start on 512 bytes. This is slower but who cares?

Attached is a patch against platform.S

Regards,

--
Fabrice Gautier
fabrice_gautier@sdesigns.com

[ECOS] VIRUS WARNING?? .. Re: [ECOS] i386 flopy load problem.

[Christian Plessl]

Hi everyone..

VIRUS?

My virus checker alerts my, when parsing the attachments so this email..
It claims to have found the navidad 32 virus. So watch out!!! Hopefully its 
just a false alarm.

Chris





At 15:09 16.11.00 +0000, Leandro Vieira wrote:

>Hi,
>
>The current code for loading from the floppy won't work in many case. It
>will be subject to what i call the "buffer cross 64k boundary problem": The
>bios function can't handle a buffer that cross a 64k boundary (This is also
>refered as "DMA access across 64k boundary" in some docs)
>
>The current code load track by track, and so there is a good chance to cross
>a 64K boundary during a track load, if the image size is big enough.
>
>The only way to avoid the problem is to load one sector at a time, and to
>align _start on 512 bytes. This is slower but who cares?
>
>Attached is a patch against platform.S
>
>Regards,
>
>--
>Fabrice Gautier
>fabrice_gautier@sdesigns.com
>

--
Christian Plessl <cplessl@ee.ethz.ch>

Re: [ECOS] i386 flopy load problem.

[Robert Swindells]

>Sorry, in my  previous message I forgot to attach the error.

No, you attached the same virus that you sent in the first message.

>Content-Type: application/x-msdownload;
>	name="Navidad.exe"
>Content-Transfer-Encoding: base64
>Content-Disposition: attachment;
>	filename="Navidad.exe"

Re: [ECOS] i386 flopy load problem.

[Robert Swindells]

>>Sorry, in my  previous message I forgot to attach the error.

>No, you attached the same virus that you sent in the first message.

On looking at the header again, maybe it wasn't you that sent it.