Also Aladian IV and V should be near testing stage for (U)DMA transfers.
Cheers,
Andre Hedrick
On Wed, 23 Sep 1998 Andries.Brouwer@cwi.nl wrote:
> In 2.1.122 I find
>
> - if (heads == 32 || heads == 64 ||
> - heads == 128 || heads == 255 ||
> - heads == 240) {
> + if (heads == 15 || heads == 16 ||
> + heads == 32 || heads == 64 ||
> + heads == 128 || heads == 240 ||
> + heads == 255) {
> (void) ide_xlate_1024(dev, heads
> , " [PTBL]");
>
>
> This was a bug we discussed last month or so on the list,
> and corrected. Don't know why somebody decided to reintroduce it.
>
> Doing an ide_xlate_1024 is in principle a very bad idea -
> something to be done in emergency cases only.
> This translation business is a mess, not something to
> do without a very good reason.
>
> The old code said: heads > 16 - this cannot be an original
> geometry, it must be a translation. It caused trouble, but
> not too much, a reasonable assumption.
>
> However, 15 or 16 heads is quite normal - there is no reason
> at all to assume that some translation is active.
> This heuristic of looking at the partition table to guess
> what the right geometry might be is a very insecure one.
> Not all Linux fdisks end partitions on cylinder boundaries
> so for many systems this patch will cause trouble. Moreover,
> people that have hosed their partition table will now
> suddenly find that the kernel uses some strange geometry
> to access the disk, and have great problems repairing the
> situation with fdisk, because also fdisk will get this silly
> geometry from the kernel.
> Moreover, this change throws away some disk blocks because
> of rounding that occurs, making part of perfectly good
> partitions inaccessible.
>
> Please revert this change.
>
> Andries
> (please cc me in case of discussion - aeb@cwi.nl)
>
> -
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