Adding SDMapper drivers (v1 and v2)

[fbelavenuto]

This PR (related to issue #114) adds two drivers for the SDMapper project.
This project has two hardware versions:
https://github.com/fbelavenuto/msxsdmapper
https://github.com/fbelavenuto/msxsdmapperv2

I am the creator of the sdmapper project and my friend sdnatcher helped me optimize the driver.

Closes #114

[Konamiman]

Hi @sdsnatcher, I'm preparing a new release of the Nextor kernel and I'd like to include this pull request. It's really unfortunate that I didn't do that before, while Fabio was still with us, so he would have seen recognition for his work, and I'm really sorry about that.

I don't have a SDMapper, so I verified that the driver sources he provided in combination with the changes to the makefile work as intended and apparently proper ROM files are created when I run make, but I can't go further than that. Fabio mentioned you in the description of this pull request so I assume you have the hardware, could you please do a quick test of the ROM files? You can checkout the branch of this pull reques and build the files yourself, or use the ones I generated, attached below:

Nextor-2.1.1.SDMapper.zip

Thank you very much!

[sdsnatcher]

Hi @Konamiman ! Could you please compile the 2.1.3 ROM, so I can test this issue and the issue #19 in a single run?

[Konamiman]

@sdsnatcher Sure, here are the ROM files (remove the .txt extension, GitHub doesn't like .ROMs):

Nextor-2.1.3.SDMapperv2.ROM.txt
Nextor-2.1.3.SDMapperv1.ROM.txt

[rybarczykbr]

Hi @Konamiman .

I've tested Nextor-2.1.3.SDMapperv1.ROM.txt, but the SDMAPPER v1 driver version 1.0.7 has a bug that causes FDISK to not detect any devices, as reported here.

This issue is still present.

I assembled a Nextor 2.1.2 ROM with MKNEXROM, using SDMAPPER driver version 1.0.4, and it worked fine. Unfortunately I don't have the necessary skill to fix the driver.

If you would like to take a look, the driver is here.