Messages in this thread | ![/](/images/icornerl.gif) | | From | Mikael Pettersson <> | Date | Wed, 15 Jan 2003 15:21:13 +0100 | Subject | Re: PATCH: [2.4.21-pre3] Fix for Promise PIO Lockup |
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Ross Biro writes: > Newer kernels will lock up when a drive command (SMART, hdparm -I, etc.) > is issued to a drive connected to a Promise 20265 or 20267 controller > while the controller is in DMA mode. The problem appears to be that > tune_chipset incorrectly clears the high PIO bit thinking that it is a > "PIO force on" bit. The documentation I have access to does not seem to > mention a PIO force bit. Not changing that bit seems to fix the problem > with drive commands on a promise controller. > > The documentation I have also says the values for the TB and TC > variables should be the same for all UDMA modes and they are not. > However the driver seems to work anyway, so I left them the way they are. > > To reproduce this problem make sure your drive is set to a DMA mode, eg > hdparm -X 67 and then issue a drive command, e.g. hdparm -I.
I have tried to reproduce this problem according to your description above, but neither my 20269 (with "new" driver) nor my 20267 (with "old" driver) hangs. I checked with kernels 2.5.58 and 2.4.21-pre3.
Maybe something else is needed for the hang to occur?
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