DOSFS tuning question <???>

[Thomas Doerfler]

Daniel,

surely you can modify the sector sizes, but be aware, that the 
code has only been heavily tested with 512 byte/sector. I think 
the msdos_format module has one or two locationes, where 512 
byte/sector are implied.

For tuning, you might try to increase the "sectors per cluster" 
value during formatting. This will reduce the overhead needed 
for administration.

wkr,
Thomas.


> 
> Hello.
> 
> 
> Using rtems 4.6.2 with FAT(dosfs) and a ramdisk on a solaris with TSIM as
> simulator.
> 
> I really would like to tune dosfs to different sectorsizes. Is this
> possible. 
> 
> In fat_init_volume_info() in fat.c I found this:
> 
> ...
> vol->bps = FAT_GET_BR_BYTES_PER_SECTOR(boot_rec);
>  
>     if ( (vol->bps != 512)  && 
>          (vol->bps != 1024) && 
>          (vol->bps != 2048) &&
>          (vol->bps != 4096))
>     {     
>         rtems_disk_release(vol->dd);
>         set_errno_and_return_minus_one( EINVAL );
>     }
> ...
> 
> Can this be modified in without to much trouble. Do someone have some tips.
> 
> I want to try sectorsizes 8KByte, 16Kbyte and 32Kbyte.
> 
> Any tips is appreciated...
> 
> 
> REGARDS
> Daniel

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