Messages in this thread | | | Date | Thu, 30 Aug 2007 12:47:47 +0200 | From | "Espen M. Rutger" <> | Subject | Re: ide.c and compactFlash |
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Lennart Sorensen wrote: > On Thu, Aug 23, 2007 at 01:56:35PM +0200, Espen M. Rutger wrote: > >> I got problems with the IDE code which causes the kernel to freez after >> printing out: >> >> hda: status timeout: status=0xd0 { Busy } >> >> kernel used: 2.4.18 crosscompiled with Montavista tools (ppc_82xx-gcc >> (GCC) 3.2.1 20020930 (MontaVista)) >> >> The ide interface chip is a PD6729 configured to ATA mode. >> >> CompactFlash cards: winsys 1GB industrial grade and simpleTech 1GB >> industrial grade. >> >> I beleive this is a timing issue and have tried to increase a udelay () >> to 2 microseconds (instead of 1 microsecond) in the ide_wait_stat() >> function - it took longer time to freez, but it still freezes... >> > > Try booting with 'ide=nodma'. Some compact flash cards support DMA > mode, and of course most IDE controllers support DMA mode, and if both > support it the kernel tends to try and enable it but if you don't have > the DMA lines connected it will fail and give annoying errors similar to > that one. The DMA part of compact flash was a fairly recent addition > and the two affected lines used to be reserved on compact flash. The > product I work on did not have the DMA lines on the previous board > design but we have it on the latest board revision. On the old boards > we had to disable DMA support for IDE since otherwise certain types of > compact flash would have annoying timeouts trying to enable DMA. On our > new board with the DMA lines, everything just works and the DMA access > gives about twice the read/write speed to the compact flash cards we are > using. > > -- > Len Sorensen > >
Thank you very much for your response Lennart, but unfortunately this did not solve my problem - the system (got four machines in my test setup) still generate the error and make the kernel wait forever.
regards Espen M. Rutger
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