From: "Steven A. Falco" <sfalco@harris.com>
To: Lixin Yao <Lixin.Yao@HSTX.com>
Cc: linuxppc-dev@ozlabs.org, Aaron Pace <kodiakuppercut@gmail.com>
Subject: Re: Can not get PATA to work for Compact Flash with 2.6.28 kernel
Date: Mon, 02 Feb 2009 16:51:55 -0500 [thread overview]
Message-ID: <49876AFB.3060207@harris.com> (raw)
In-Reply-To: <03D77CA4AC7F4D48A6AB5DA3F1001B3F10A4B9@exchtxus2.HSTX.global.vpn>
Lixin Yao wrote:
> Steven/Aaron,
>
> I found the problem. On my board, the CF is on a 16 bit interface on bus
> of MPC8248. The HW is connected in Big Endian format. PPC Bit D0 is
> connected to CF Bit D15, and PPC D1 to CF Bit D14, till PPC D0 to CF
> D15. I had to swap the bytes in u-boot. I forgot to do it in Kernel.
>
> After making the change, CF is detected. But I can not access /dev/hda
> or any scsi/sda devices under /dev.
>
How did you swap the bytes? The CF will be accessed both in byte mode
and in 16-bit mode. So this is tricky to do in software. When we
wired our CF, we deliberately swapped the bytes in hardware. So the
processor bus MSB goes to pin 6 of the CF.
Steve
next prev parent reply other threads:[~2009-02-02 21:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-30 22:23 Can not get PATA to work for Compact Flash with 2.6.28 kernel Lixin Yao
2009-02-02 14:59 ` Steven A. Falco
2009-02-02 15:52 ` Lixin Yao
2009-02-02 16:37 ` Steven A. Falco
2009-02-02 20:39 ` Lixin Yao
2009-02-02 21:51 ` Steven A. Falco [this message]
2009-02-02 22:00 ` Lixin Yao
2009-02-04 14:26 ` Steven A. Falco
-- strict thread matches above, loose matches on Subject: below --
2009-02-02 20:14 Aaron Pace
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