Messages in this thread | | | From | (Tom Crane) | Subject | Re: [2.3.3x] ALI M15x3 chipset support (EXPERIMENTAL) | Date | 15 Jan 00 21:55:26 GMT |
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In article <fa.in6m4av.u5iq9d@ifi.uio.no>, Andrzej Krzysztofowicz <ankry@green.mif.pg.gda.pl> writes:
Hi,
>> >From dmesg I have, >> >> ALI15X3: MultiWord DMA enabled >> hda: Maxtor 90680D4, 2014MB w/256kB Cache, CHS=826/255/63, (U)DMA > ^^^^ > This means that kernel decides your chipset is not UDMA capable, while the > drive is... > > Note, that driver author (from ALI) suggested that for M5229 rev. <= 0x20 > UDMA is "not stable", so it should be disabled by the driver...
Thanks for pointing this out. Do you know what the upgrade possibilities to a later rev. are? I could not find any useful info on Ali's website. Is the rev. 0x20 code h/w or firmware in the chip? If f/w can it be upgraded? Does anybody know the nature of the 'instability' ?
> I observe, that for many BIOSes timings are calculated basing on maximum > possible PCI clock (42.5 MHz ?) rather than on currently being set one. > It effects in a bit worse transfer results. To test it you can try: > > 1. put the idebus=... parameter to the kernel during boot > (I use idebus=30, as set on my MoBo) > 2. hdparm -d0 ... > 3. hdpatm -p ... # calculate new timings > 4. hdparm -X34 ... > 5. hdparm -d1 ... > > Difference shouldn't be meaningfull, but results slightly better.
I hope to try this once I have backed-up my root HD. I'm puzzled by the argument to idebus. Where do you get the 30 from? I cannot find any mention of ide bus speeds in my MB manual. It just says it supports 'bus master ide dma 33MHz/sec'...
On a related issue: I find kernel 2.3.37 which I am running at the moment does not report the "ide: Assuming xxMHz system bus speed..." at all. Previously I was running 2.3.24 which did report 40MHz assumed speed. I did a quick grep of the two sources and the routines for this in drivers/block/{ide.c,ali15x3.c} are the same. Any idea whats going on?
Regards Tom. -- Tom Crane, Dept. Physics, Royal Holloway, University of London, Egham Hill, Egham, Surrey, TW20 0EX, England. Email: uhap023@vms.rhbnc.ac.uk SPAN: 19.875 Fax: 01784 472794
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