Re: Awful long timeouts for flash-file-system
From: Robert Hancock
Date: Tue Mar 15 2005 - 00:24:07 EST
linux-os wrote:
Hello IDE experts.
I am trying to use a SanDisk SDCFB-256, CFA DISK drive. This
is supposed to emulate an IDE drive and does (sort of). However,
upon boot, the boot-code keeps trying and trying and trying to
do SOMETHING that aparently isn't even necessary because the
virtual disk is accessible and can be written/read and I can
even boot from it.
hdb: max request size: 128KiB
hdb: 501760 sectors (256 MB) w/1KiB Cache, CHS=980/16/32, DMA
hdb: cache flushes not supported
hdb:<4>hdb: dma_timer_expiry: dma status == 0x61
I'm assuming you're using a CF-to-IDE adapter to hook up the card. Most
likely your CompactFlash card is indicating that it supports DMA and the
kernel is trying to use it. However, many CF-to-IDE adapters don't hook
up the DMA control lines properly so the requests all time out until the
kernel gives up using DMA.
We use some Mesa Electronics CF-IDE adapters at work - some of the newer
ones have some jumpers with positions NOR and DMA, DMA works if the
jumpers are set to the DMA position. I don't think we've tried using any
DMA-supporting CF cards on the older ones without these jumpers.
If the adapter you're using doesn't do DMA, I believe that if you use
options like hdb=nodma or ide1=nodma, etc. that will get the kernel to
not try and use it.
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@xxxxxxxxxxxxx
Home Page: http://www.roberthancock.com/
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