DOSFS problems

Thomas Doerfler Thomas.Doerfler at
Mon Mar 8 19:13:16 UTC 2004

Hello Adriano,

can you post more information about your 
environment? What RTEMS version are you using, 
what are the sizes of your harddisk paritions, 
what type of FAT file system do you have there? 
How do you try to mount the file systems?

I have adapted the RTEMS DOS-FS to pc386 and 
MPC860 hardware, fed my changes back to RTEMS 
(they are in 4.6.0 now), and finally had the 
impression that things are running fine now. 


> Hi, all
> I'm trying to mount the primary master HD on a PC motherboard 
> (BSP=pc386) but the operation fails with all disks I connect. All of 
> them are DOS-formatted. Using different mix DOS versions/HD model 
> doesn't solve the problem.
> Tracking the code I see that RTEMS uses the BPB within the MBR but finds 
> wrong data.
> I verify also that RTEMS always reads the data effectively on the HD, so 
> the problem seems to be the initialization of the HD. Correct ?
> If yes, can anyone kindly explain to me how to initialize it ?
> Thank you in advance.
> A. Verardo

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