Hi!
I send to Matija testing kernel, but, while I not receive results, let
me discuss possible reason to errors.
______________O\_/_________________________________\_/O______________
STATIC COUNT Genblockio(ddt * pddt, UWORD mode, WORD head, WORD track,
WORD sector, WORD count, VOID FAR * buffer)
return LBA_Transfer(pddt, mode, buffer,
((ULONG) track * pddt->ddt_bpb.bpb_nheads + head) *
pddt->ddt_bpb.bpb_nsecs + pddt->ddt_offset + sector,
count, &transferred);
STATIC WORD Genblkdev(rqptr rp, ddt * pddt)
case 0x42: /* format/verify track */
int ret = Genblockio(pddt, LBA_FORMAT, head, cyl, 0,
pddt->ddt_bpb.bpb_nsecs, DiskTransferBuffer);
STATIC int LBA_to_CHS(ULONG LBA_address, struct CHS *chs, const ddt * pddt)
const bpb *pbpb = hd(pddt->ddt_descflags) ? &pddt->ddt_defbpb : &pddt->ddt_bpb;
unsigned hs = pbpb->bpb_nsecs * pbpb->bpb_nheads;
unsigned hsrem = (unsigned)(LBA_address % hs);
LBA_address /= hs;
if (LBA_address > 1023ul)
{
put_string("LBA-Transfer error : cylinder > 1023\n");
return 1;
}
STATIC int LBA_Transfer(ddt * pddt, UWORD mode, VOID FAR * buffer,
ULONG LBA_address, unsigned totaltodo,
if (LBA_to_CHS(LBA_address, &chs, pddt))
return failure(E_CMD); /*dskerr(1)*/
_____________________________________________________________________
O/~\ /~\O
As you may see, there called Genblkdev()->Genblockio()->LBA_Transfer() and,
at last, LBA_to_CHS(), which makes error. As I understand, trouble is that
LBA_to_CHS() computes different values, than used in Genblockio(). Why?
There are two differences: LBA_to_CHS() for HD uses .ddt_defbpb instead
.ddt_bpb (but error happen on floppy diskette), and Genblockio() uses
ddt_offset. So, I may suggest, trouble is that ddt_offset contains some
wrong (nonzero) value.
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