how to use CF card in uclinux?

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originally posted by xlking@Dec 16 2004, 04:18 AM

i use cyclone board and the system detected cf card, but have error.

so i can't format cf card use command: fdisk /dev/hda

help me!

thanks a lot.

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Let's assume for a moment that it's a problem with uClinux rather than with your Nios project.

If uClinux recognized the cf card and was able to tell you the brand name and size, then it is able to read the card. # hda: SanDisk SDCFB-8, CFA DISK drive

ide0 at 0x80900800-0x80900807,0x80900838 on irq 8

hda: max request size: 128KiB

hda: 15680 sectors (8 MB) w/1KiB Cache, CHS=245/2/32

hda: hda1

I had the same error:

Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2

ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx

CF: ctl=1

Unable to initialize compact flash card. Please re-insert

Using anticipatory io scheduler

uClinux may be trying to read the cf configuration before the card is ready. There is a note in the documentation somewhere saying not to boot with the cf installed. Try installing the cf after the system has initialized and you've logged in.

I assume that you were able to mount the cf.# mount /dev/hda1 /mnt/ide0 -n

It might get hosed if you don't unmount before removing it.# umount /dev/hda1

fdisk: fdisk makes all documents go away.

If the cf filesystem gets messed up, you may want to reformat it in your computer instead. I use the soyo bayone xp internal 9 in 1 card reader (http://www.amazon.com/exec/obidos/asin/b00024paou/pendulumresource). Dazzle also makes several nice external USB card readers.

There is a caveat in the documentation somewhere against writing to the cf. I was able to write to it, though.

I hope that helps.