> I have prepeared a Boot floppy (and a CD with the image) with a boot > menu and different drivers, here is what I got from a very small sample:
> UIDE.SYS worked every time > AHCI.SYS did not work on my SATA machine, aparently it works only with > specific Intel chips. It shows an Intel message. if UIDE works, AHCI can't work and vice versa, as S-ATA controllers are running either in 'Legacy' (=S-ATA) or 'Advanced' (=AHCI) mode they even have different PCI id's depending on the mode Tom > OAKCDROM.SYS worked only and with all IDE/CDROM, as expected. > So UIDE is the best, by far. I will keep AHCI as optional anyway because > there *could* be a mahine with AHCI only... > Thanks for UIDE, > Alain > PS: and Thanks for FreeDOS to :) > Em 25-04-2010 11:25, Johnson Lam escreveu: >> On Sun, 25 Apr 2010 15:16:14 +0200, you wrote: >> >> Hi Bernd, >> >>> To make a long story short: Jack R Ellis has had a number of drivers >>> developed for access to optical units and discs, most of this software >>> has sourcecode available. His latest is UIDE.SYS which should support CD >>> drives also on Serial-ATA (possibly in AHCI-mode, or just IDE-emulation). >> >> UIDE have no AHCI support, only "Native IDE" or "Legacy IDE" >> supported, I've asked him the reason, his answer below: >> >> [quote begin] >> >> UIDE does benefit from usually having a LOT of "rotational >> latency" time, between disk transfers, so the next transfer will be >> set up and begun long before the disk can "rotate" back to the first >> sector of that new transfer. >> >> AHCI tries to "help" with this by "chaining" disk commands, so when >> one disk command ends, the next in the "chain" can be begun without >> the disk driver needing an interrupt or more processing. However, >> AHCI requires "asynchronous" I-O, like Windows uses, NOT "one at a >> time" I-O like DOS uses. So, I doubt AHCI will ever see a lot of >> use under DOS -- I see no reason for it in UIDE, and I think other >> disk-driver writers will probably feel the same. >> >> [quote end] >> >> >> Rgds, >> Johnson. > ------------------------------------------------------------------------------ > _______________________________________________ > Freedos-devel mailing list > Freedos-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freedos-devel Mit freundlichen Grüßen/Kind regards Tom Ehlert +49-241-79886 ------------------------------------------------------------------------------ _______________________________________________ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
