On Tue, 26 Feb 2008 21:32:30 -0500 Jerry Van Baren gvb.uboot@gmail.com wrote:
The changeset that causes my problems is ee62ed32
The original code calls init_phy(dev) followed by phy_change(dev) *once* during PHY initialization. The part of changeset that appears to cause my problems is calling phy_change(dev) every time uec_init() is called.
phy_change is there so that u-boot will renegotiate the link in case its state has changed since the last networking command (this was the original complaint that warranted the ee62ed32 patch, iirc).
On my mpc8360emds board, without this change the second command that does a network operation hangs the board (requires a hard reset to recover). Example failure sequence is two "ping" commands: the first works, the second hangs the board.
This also speeds up the network initialization and doesn't cause a packet error on the first TFTP packet.
Signed-off-by: Gerald Van Baren vanbaren@cideas.com
Kim:
Does this make any sense? Any thoughts why it isn't causing problems for you? It makes all the difference in the world for me.
One other interesting sequence difference with patch ee62ed32 is that the ethernet MAC address is set on every uec_init() call. The following code was inside the "if (uec->the_first_run == 0)" conditional, now it is outside the conditional and thus run on every uec_init() call. Functionally, it doesn't seem to matter for me either way, but seems unnecessary.
/* Set up the MAC address */if (dev->enetaddr[0] & 0x01) {printf("%s: MacAddress is multcast address\n",__FUNCTION__);return -1;}uec_set_mac_address(uec, dev->enetaddr);
this was done in order to be able to re-set eth[1]addr between networking commands, and have the new eth[1]addr value actually programmed on the interface.
I've tested 100BT, and experience the same as you. The reason u-boot doesn't recover is that i is not incremented in genmii_update_link(), but adding that doesn't resolve the problem. I believe the PHY status is being incorrectly determined somehow - these PHYs are really finicky :/.
Kim