On 09/08/2011 10:39 AM, Florian Fainelli wrote: > > Hello Jurgen, > > On Thursday 08 September 2011 08:54:07 Lambrecht Jürgen wrote: > > Hello, > > > > In our embedded designs, this is a useful patch. Maybe it can be useful > > for somebody else too. > > Or maybe there are already better solutions? > > I know I could also write a driver for our switch, but that is too much > > effort just to select the active port. > > This is not going to work well with all switches out there. You could > use the > Do not all switches follow the basic MII register map with room for 31 phy's? > > fixed-PHY driver to make your ethernet driver see the link as always > up between > the MAC and switch CPU port. > Indeed, I tried to, but it didn't work. (would be my preferred solution) I juist enabled FIXED_PHY in menuconfig (and kept MII, NET_ETHERNET and FEC (for my iMX cpu); also PHYLIB is on that makes mdio_bus.c compile). I checked the architecture file for mpc866ads and didn't find any init for it, but maybe I need to initialize fixed-PHY somewhere? However, it could be interesting sometimes from application side to know if the real external link is up, then fixed-PHY is not ok. > > > A better solution would be to have proper switch drivers and > user-space, which > reminds me that we (OpenWrt) should at some point propose our switch > drivers > [1] for review. > > [1]: > https://dev.openwrt.org/browser/trunk/target/linux/generic/files/drivers/net/phy/ > Just had a fast look to the Marvell switch driver. Nice to know it is there. > > > > > > Kind regards, > > Jürgen > > > > In embedded design, instead of a PHY, sometimes a switch is used that > > behaves as a PHY through its MII port. For example to use a > > daisy chain network configuration instead of an expensive star > config. In > > that case, many phy ports are available, but only 1 should be used > > to check link status, and not the first one available as is > > the case > > without this configuration (that is, set to its default value > > 0). So this options specifies the switch port number to be used to check > > link status, because if the link is down, no data is sent > by the > > TCP/IP stack. > > > > Signed-off-by: Jürgen Lambrecht <J.Lambrecht@xxxxxxxxxxx> > > --- > [snip] > > -- > Florian > -- Jürgen Lambrecht R&D Associate Tel: +32 (0)51 303045 Fax: +32 (0)51 310670 http://www.televic-rail.com Televic Rail NV - Leo Bekaertlaan 1 - 8870 Izegem - Belgium Company number 0825.539.581 - RPR Kortrijk ��.n��������+%������w��{.n�����{��w��ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
