Question

Write data to HDD sectors using write DMA command (0xCA)

Asked by: nedfine

I am trying to write data to hdd sectors usig write DMA command. (0xCA)
The command gets executed successfully without any error, but the data is not getting written to the sectors. I am using DJGPP compiler and I am executing the code in dos mode only.
After executing the program, sectors are filled with some garbage values.  How do i pass the data buffer to this method?

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Asked On
2008-08-11 at 03:56:07ID23637435
Topics

C++ Programming Language

,

C Programming Language

Participating Experts
1
Points
500
Comments
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Answers

 

by: DanRollinsPosted on 2008-08-11 at 16:35:55ID: 22209127

Please tell me more about the "DMA command" that you are using,

 

by: nedfinePosted on 2008-08-11 at 22:51:05ID: 22210338

Thanks for the response.

I am using the ATA Command to write data to sectors using DMA access. Write DMA (0xCA).
For this we have to pass some parameters to the Base port address of IDE controller.like 0xIF0 and 0x170.. This parameter inputs contains sector address where we need to write the data. and command (0xCA) sector count etc.
I am able to execute the command successfully. But I dont know where and how I need to keep the data buffer so that while executing the ATA command it will take the data from that memory location.
Now what has  happened is that after executing the command (0xCA), it is writing some other data  to the hard disk sectors.
So I want to know where and how I can keep my buffer so that the command can refer that buffer to fill the sectors.
 
You can see more details about this ATA command in ATA/ATAPI standard 6.0 .
 
Thanks,
Ned

 

by: DanRollinsPosted on 2008-08-12 at 13:45:56ID: 22216941

You are doing direct I/O through the ports?  Why would you want to do that?  I suggest using BIOS functions.  But in answer to your question, take a look at

    22.3.4. Programming the DMA
   http://docs.freebsd.org/doc/2.1.7-RELEASE/usr/share/doc/handbook/handbook249.html
and
    22.3.5. DMA Port Map
   http://docs.freebsd.org/doc/2.1.7-RELEASE/usr/share/doc/handbook/handbook250.html

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