From: llandre <llandre@wawnet.biz>
To: benh@kernel.crashing.org
Cc: "Stefan Roese" <stefan.roese@esd-electronics.com>,
wd@denx.de, linuxppc-embedded@lists.linuxppc.org
Subject: Bug in new IBM 4xx on-chip Ethernet drivers?
Date: Wed, 03 Mar 2004 10:48:00 +0100 [thread overview]
Message-ID: <6.0.1.1.0.20040303103039.01efcac0@dns.struinfo.it> (raw)
Hi Benjamin,
I'm working with a custom 405EP-based board. So far I used the kernel 2.4.20
and now I'm moving to the 2.4.23. I realized that the on-chip Ethernet MAC
driver
changed.
I have a question about the function emac_phy_read in ibm_ocp_enet.c file.
In my understanding the following snippet is not correct
/* Clear the speed bits and make a read request to the PHY */
stacr = ((EMAC_STACR_READ | (reg & 0x1f)) & ~EMAC_STACR_CLK_100MHZ);
stacr |= ((mii_id & 0x1F) << 5);
because it assumes the OPB clock frequency is 50MHz. If it differs,
the MII clock frequency generated by the Ethernet controller is erroneous.
For example, with OPB frequency = 66MHz, the MII clock frequency is set
to 3.3MHz (this should be 2.5MHz).
I had already reported the problem to Armin Kuster (please see the message
http://lists.linuxppc.org/linuxppc-embedded/200306/msg00134.html) and I
proposed
a solution but I got no response.
What do you think?
TIA and best regards,
llandre
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next reply other threads:[~2004-03-03 9:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-03 9:48 llandre [this message]
2004-03-03 10:57 ` Bug in new IBM 4xx on-chip Ethernet drivers? Benjamin Herrenschmidt
2004-03-03 11:59 ` llandre
2004-03-03 18:46 ` Matt Porter
2004-03-03 18:36 ` Eugene Surovegin
2004-03-08 8:41 ` llandre
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