From: "Joakim Tjernlund" <Joakim.Tjernlund@lumentis.se>
To: "Eitan Rabin" <rabin@mellanox.co.il>,
<linuxppc-embedded@lists.linuxppc.org>
Subject: Re: MPC860 and I2C
Date: Thu, 8 May 2003 23:19:12 +0200 [thread overview]
Message-ID: <002501c315a7$7e309260$020120b0@jockeXP> (raw)
In-Reply-To: 506C3D7B14CDD411A52C00025558DED603018B6A-100000@mtlex01.yok.mtl.com
> Hi All,
>
> I'm trying to use the MPC I2C controller to generate I2C transactions. I
> use the devel kernel version and include the I2C relocation patch (seen
> in /var/log/messages).
Can you post the message it prints?
>
> I used the standard I2C driver and also tried the driver downloaded
> directly from lmsensors.
>
> The problem occurs when I activate the master. As soon as I give the
> master the start command (i2c->i2c_i2com = 0x80) for the DMA transaction
> to start the CPU complete freezes.
> I narrowed the problem and found out the it is actually the address of the
> descriptor the one causing the CPU to hang. If I give addresses that are
> relatively small, few Kilos, then everything is OK. If I give addresses
> that are given to me by kmalloc and translated properly then the cpu
> hangs.
What address? Have you made any changes to the driver?
Can you post some example code?
> It seems to me that maybe something is wrong with the SDMA
> configuration.
hmm, if SDMA doesn't work as it should I think you would experience
problems with the console and ethernet.
Make sure that SDA and clock signals has a pull up resistor.
Jocke
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2003-05-08 21:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-08 19:04 MPC860 and I2C Eitan Rabin
2003-05-08 21:19 ` Joakim Tjernlund [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-05-08 19:18 Steven Blakeslee
2003-05-08 19:20 ` Eitan Rabin
2003-05-08 21:24 ` Joakim Tjernlund
2003-05-08 22:17 ` Eitan Rabin
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