I just realized that the v2.6.37-rc2 kernel does not boot any more on
the Alchemy GPR board. It works fine with v2.6.36. It hangs in the
probe function of the au1000_eth driver when probing the second
ethernet port (eth1):
au1000-eth au1000-eth.0: (unregistered net_device): attached PHY driver
[Generic PHY] (mii_bus:phy_addr=0:00, irq=-1)
au1000-eth au1000-eth.0: eth0: Au1xx0 Ethernet found at 0x10500000, irq 35
au1000_eth: au1000_eth version 1.7 Pete Popov <firstname.lastname@example.org>
... hangs ...
Similar messages should follow for eth1. I narrowed down (bisect'ed) the
problem to commit:
Author: Florian Fainelli <email@example.com>
Date: Wed Sep 8 11:15:13 2010 +0000
au1000-eth: remove volatiles, switch to I/O accessors
Remove all the volatile keywords where they were used, switch to using the
proper readl/writel accessors.
Signed-off-by: Florian Fainelli <firstname.lastname@example.org>
Signed-off-by: David S. Miller <email@example.com>
The kernel actually hangs when accessing "&aup->mac->mii_control" in
au1000_mdio_read(), but only for eth1. Any idea what does go wrong?
In principle, I do not want to access the MII regs of the MAC because
eth0 and eth1 are connected to switches. But that's not possible, even
with "aup->phy_static_config=1" and "aup->phy_addr=0".